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{"itemId":"TKWH3MNH","itemType":"BT_quizQuestion","questionText":"Which mass would have the greatest acceleration if the same unbalanced force was applied to each?","correctAnswerText":" 1 kg","incorrectText1":" 2 kg","incorrectText2":" 3 kg","incorrectText3":" 4 kg","categoryName":"Motion_in_Two_Dimensions","exp_screen_enable":"1","exp_screen_text":" 1 kg"},
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{"itemId":"P6MJAV9A","itemType":"BT_quizQuestion","questionText":"A negatively charged rod is brought in contact with an electroscope. As the rod gives up electrons, the number of protons in the rod will","correctAnswerText":" remain the same","incorrectText1":" decrease","incorrectText2":"increase","incorrectText3":"","categoryName":"Electricity","exp_screen_enable":"1","exp_screen_text":" remain the same"},
{"itemId":"UQWQF575","itemType":"BT_quizQuestion","questionText":"A particle of aluminum is found to have 13 protons in its nucleus with 10 electrons in orbit around the nucleus. This particle would be","correctAnswerText":" positively charged","incorrectText1":" negatively charged","incorrectText2":"electrically neutral","incorrectText3":"heavier than a normal aluminum atom","categoryName":"Electricity","exp_screen_enable":"1","exp_screen_text":" positively charged"},
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{"itemId":"PN2L96BB","itemType":"BT_quizQuestion","questionText":"In a pinhole camera where no lens is used, the image of an object is upside down. This is taken as evidence that light","correctAnswerText":" travels in straight lines","incorrectText1":" is a waveform","incorrectText2":" has a particle nature","incorrectText3":" has a short wavelength","categoryName":"Light","exp_screen_enable":"1","exp_screen_text":" travels in straight lines"},
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{"itemId":"JLUE7AS3","itemType":"BT_quizQuestion","questionText":"If the current through a coil of wire is decreased, the magnetic field strength of the wire coil will","correctAnswerText":" decrease","incorrectText1":" increase","incorrectText2":" remain the same","incorrectText3":"","categoryName":"Magnetism","exp_screen_enable":"1","exp_screen_text":" decrease"},
{"itemId":"OJD382TT","itemType":"BT_quizQuestion","questionText":"As the current in a coil of wire is increased, the magnetic field strength","correctAnswerText":" increases","incorrectText1":" decreases","incorrectText2":" remains the same","incorrectText3":"","categoryName":"Magnetism","exp_screen_enable":"1","exp_screen_text":" increases"},
{"itemId":"IUZ6WZCL","itemType":"BT_quizQuestion","questionText":"A particle is being accelerated by a magnetic field. This particle must be","correctAnswerText":" charged and in motion","incorrectText1":" neutral and stationary","incorrectText2":" neutral and in motion","incorrectText3":" charged and stationary","categoryName":"Magnetism","exp_screen_enable":"1","exp_screen_text":" charged and in motion"},
{"itemId":"DABOWI8Z","itemType":"BT_quizQuestion","questionText":"As the distance between two opposite magnetic poles increases, the flux density midway between them","correctAnswerText":" decreases","incorrectText1":" increases","incorrectText2":" remains the same","incorrectText3":"","categoryName":"Magnetism","exp_screen_enable":"1","exp_screen_text":" decreases"},
{"itemId":"QN3LV800","itemType":"BT_quizQuestion","questionText":"If the current through a solenoid increases, the magnetic field strength of the solenoid","correctAnswerText":" increases","incorrectText1":" decreases","incorrectText2":" remains the same","incorrectText3":"","categoryName":"Magnetism","exp_screen_enable":"1","exp_screen_text":" increases"},
{"itemId":"NYPFMZ78","itemType":"BT_quizQuestion","questionText":"A device that converts light energy directly to electrical energy is a","correctAnswerText":" photocell","incorrectText1":" thermocouple","incorrectText2":" transducer","incorrectText3":" neon bulb","categoryName":"Modern_Physics","exp_screen_enable":"1","exp_screen_text":" photocell"},
{"itemId":"CQ0VA8VA","itemType":"BT_quizQuestion","questionText":"Which color of light has the greatest energy per photon?","correctAnswerText":" violet","incorrectText1":" red","incorrectText2":" green","incorrectText3":" blue","categoryName":"Modern_Physics","exp_screen_enable":"1","exp_screen_text":" violet"},
{"itemId":"FRZ6BCMT","itemType":"BT_quizQuestion","questionText":"Photons with an energy of 5 electron volts strike a photoemissive surface causing the emission of 2 electron-volt photoelectrons. If photons with 10 electron volts of energy strike the same photoemissive surface, what will be the energy of the emitted photoelectrons?","correctAnswerText":" 7 eV","incorrectText1":" 5 eV","incorrectText2":" 2 eV","incorrectText3":" 8 eV","categoryName":"Modern_Physics","exp_screen_enable":"1","exp_screen_text":" 7 eV"},
{"itemId":"GNW5YU1C","itemType":"BT_quizQuestion","questionText":"Which color of light has the greatest energy per photon?","correctAnswerText":" violet","incorrectText1":" blue","incorrectText2":" green","incorrectText3":" red","categoryName":"Modern_Physics","exp_screen_enable":"1","exp_screen_text":" violet"},
{"itemId":"4SYSO74M","itemType":"BT_quizQuestion","questionText":"The ratio of the energy of a quantum of electromagnetic radiation to its frequency is","correctAnswerText":" Planck’s constant","incorrectText1":" the electrostatic constant","incorrectText2":" the electron volt","incorrectText3":" the gravitational constant","categoryName":"Modern_Physics","exp_screen_enable":"1","exp_screen_text":" Planck’s constant"},
{"itemId":"WLMA9G83","itemType":"BT_quizQuestion","questionText":"An echo heard when a person shouts in a canyon is due to the sound waves being","correctAnswerText":" reflected","incorrectText1":" mixed","incorrectText2":" refracted","incorrectText3":" diffracted","categoryName":"Sounds","exp_screen_enable":"1","exp_screen_text":" reflected"},
{"itemId":"A90A8GNH","itemType":"BT_quizQuestion","questionText":"When sound passes from one gaseous medium to another having a different density, which is most likely to occur?","correctAnswerText":" refraction","incorrectText1":" standing wave","incorrectText2":" beats","incorrectText3":" Doppler shift","categoryName":"Sounds","exp_screen_enable":"1","exp_screen_text":" refraction"},
{"itemId":"Q0JAA9M3","itemType":"BT_quizQuestion","questionText":"Two tuning forks are struck at the same time. Their sound is observed to become louder and softer at regular intervals. This is caused by wave","correctAnswerText":" interference","incorrectText1":" condensation","incorrectText2":" refraction","incorrectText3":" amplification","categoryName":"Sounds","exp_screen_enable":"1","exp_screen_text":" interference"},
{"itemId":"RJC3UOWU","itemType":"BT_quizQuestion","questionText":"Beats are produced by two sound waves having different","correctAnswerText":" frequencies","incorrectText1":" amplitudes","incorrectText2":" loudness","incorrectText3":" energies","categoryName":"Sounds","exp_screen_enable":"1","exp_screen_text":" frequencies"},
{"itemId":"F8O326CP","itemType":"BT_quizQuestion","questionText":"Sound may best be described as a form of","correctAnswerText":" mechanical energy","incorrectText1":" electrical energy","incorrectText2":" chemical energy","incorrectText3":" nuclear energy","categoryName":"Sounds","exp_screen_enable":"1","exp_screen_text":" mechanical energy"},
{"itemId":"0TS9MXC4","itemType":"BT_quizQuestion","questionText":"Expansion of a solid as it is heated is due to","correctAnswerText":" increased molecular action","incorrectText1":" increased molecular size","incorrectText2":" increased numbers of molecules","incorrectText3":" increased molecular mass","categoryName":"Temperature_and_Heat","exp_screen_enable":"1","exp_screen_text":" increased molecular action"},
{"itemId":"O6ERXO0T","itemType":"BT_quizQuestion","questionText":"If 10 joules of work is completely converted into heat, the number of calories produced will be","correctAnswerText":" 2.4 cal","incorrectText1":" 0.24 cal","incorrectText2":" 24 cal","incorrectText3":" 240 cal","categoryName":"Temperature_and_Heat","exp_screen_enable":"1","exp_screen_text":" 2.4 cal"},
{"itemId":"0L9ALSDM","itemType":"BT_quizQuestion","questionText":"As the temperature of a steel wire is increased, the amplitude of vibration of the molecules in the wire","correctAnswerText":" increases","incorrectText1":" decreases","incorrectText2":" remains the same","incorrectText3":"","categoryName":"Temperature_and_Heat","exp_screen_enable":"1","exp_screen_text":" increases"},
{"itemId":"4TF59SCA","itemType":"BT_quizQuestion","questionText":"Ten joules of mechanical energy is equivalent to how many calories of heat?","correctAnswerText":" 2.4 calories","incorrectText1":" 0.24 calorie","incorrectText2":" 24 calories","incorrectText3":" 240 calories","categoryName":"Temperature_and_Heat","exp_screen_enable":"1","exp_screen_text":" 2.4 calories"},
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{"itemId":"YNRI3N77","itemType":"BT_quizQuestion","questionText":"Within a vacuum, the property common to all electromagnetic waves is their","correctAnswerText":" velocity","incorrectText1":" amplitude","incorrectText2":" frequency","incorrectText3":" wavelength","categoryName":"Waves","exp_screen_enable":"1","exp_screen_text":" velocity"},
{"itemId":"GG1EW4W3","itemType":"BT_quizQuestion","questionText":"Which characteristic is determined by the source of a wave train and will not change when the wave passes into another medium?","correctAnswerText":" frequency","incorrectText1":" wavelength","incorrectText2":" velocity","incorrectText3":" amplitude","categoryName":"Waves","exp_screen_enable":"1","exp_screen_text":" frequency"},
{"itemId":"G25TGM5I","itemType":"BT_quizQuestion","questionText":"Which waves require a medium for transmission?","correctAnswerText":" sound waves","incorrectText1":" light waves","incorrectText2":" radio waves","incorrectText3":" cosmic waves","categoryName":"Waves","exp_screen_enable":"1","exp_screen_text":" sound waves"},
{"itemId":"W5918M88","itemType":"BT_quizQuestion","questionText":"Periodic waves are being produced in a ripple tank. As the rate at which the waves are produced is increased, the wavelength of the waves will","correctAnswerText":" decrease","incorrectText1":" increase","incorrectText2":" remain the same","incorrectText3":"","categoryName":"Waves","exp_screen_enable":"1","exp_screen_text":" decrease"},
{"itemId":"Q2R7K54U","itemType":"BT_quizQuestion","questionText":"What is the velocity of a water wave that travels a distance of 10 meters in 5.0 seconds?","correctAnswerText":" 2.0 m/sec","incorrectText1":" 5.0 m/sec","incorrectText2":" 15 m/sec","incorrectText3":" 50 m/sec","categoryName":"Waves","exp_screen_enable":"1","exp_screen_text":" 2.0 m/sec"}]
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What is the average velocity of the car?","correctAnswerText":"20 m/sec","incorrectText1":"30m/sec","incorrectText2":"10m/sec","incorrectText3":"40m/s"},{"itemId":"282EF4D11C33ED941E2CEB6","itemType":"BT_quizQuestion","questionText":"Which of the following is a vector quantity?","correctAnswerText":"velocity","incorrectText1":"mass","incorrectText2":"distance","incorrectText3":"speed"},{"itemId":"0B8DB4468E7AF2707B17C73","itemType":"BT_quizQuestion","questionText":"How long will it take an object to move 100 meters if the object is traveling with an average speed of 0.5 meter per second?","correctAnswerText":"200 sec","incorrectText1":"2 sec","incorrectText2":"5 sec","incorrectText3":"50 sec"},{"itemId":"F16016BAD61D72AF95034BD","itemType":"BT_quizQuestion","questionText":"What is the distance traveled by an object that moves with an average speed of 6.0 meters per second for 8.0 seconds?","correctAnswerText":"48m","incorrectText1":"14m","incorrectText2":".75m","incorrectText3":"1.3 m"},{"itemId":"F434EBEFEECEDB45C6DDC91","itemType":"BT_quizQuestion","questionText":"Distance is to displacement as","correctAnswerText":"speed is to velocity","incorrectText1":"force is to weight","incorrectText2":"velocity is to acceleration","incorrectText3":"impulse is to momentum"},{"itemId":"5C9C5846D1FF1284FE80D64","itemType":"BT_quizQuestion","questionText":"A cart starting from rest travels a distance of 3.6 meters in 1.8 seconds. The average speed of the cart is","correctAnswerText":"2.0 m/s","incorrectText1":".2 m/s","incorrectText2":"5 m/s","incorrectText3":".5 m/s"},{"itemId":"94CBBBD6402C343F0C0B2A5","itemType":"BT_quizQuestion","questionText":"A runner completed the 100-meter dash in 10.0 seconds. Her average speed was","correctAnswerText":"10.0 m/s","incorrectText1":"0.100 m/s","incorrectText2":"100 m/s","incorrectText3":"1,000 m/s"},{"itemId":"8B04D434E2595A5115C4D51","itemType":"BT_quizQuestion","questionText":"A car travels a distance of 98 meters in 10 seconds. What is the average speed of the car during this 10-second interval?","correctAnswerText":"4.9 m/s","incorrectText1":"49 m/s","incorrectText2":"9.8 m/s","incorrectText3":"98 m/s"},{"itemId":"B1028D20140211474B4ECAB","itemType":"BT_quizQuestion","questionText":"An object accelerates uniformly from rest to a speed of 50 meters per second in 5.0 seconds. The average speed of the object during the 5.0-second interval is","correctAnswerText":"25 m/s","incorrectText1":"10 m/s","incorrectText2":"50 m/s","incorrectText3":"5.0  m/s"},{"itemId":"0D504DE1A5F3A91969D2E32","itemType":"BT_quizQuestion","questionText":"A steel ball is dropped from a height of 100 meters. The velocity of the ball after one second is 10 meters per second. What is the velocity of the ball after 2 seconds?","correctAnswerText":"20 m/sec","incorrectText1":"10 m/sec","incorrectText2":"40 m/sec","incorrectText3":"400 m/sec"},{"itemId":"D8B0E74979136BEC8204DDC","itemType":"BT_quizQuestion","questionText":"An object starting from rest accelerates at a rate of 3.0 meters/seconds squared for 6.0 seconds. The velocity of the object at the end of this time is","correctAnswerText":"18 m/s","incorrectText1":"2 m/s","incorrectText2":"3 m/s","incorrectText3":".5 m/s"},{"itemId":"B5D07AA99C5B0747B4C9A60","itemType":"BT_quizQuestion","questionText":"An object initially traveling in a straight line with a speed of 5.0 meters per second is accelerated at 2.0 meters per second squared for 4.0 seconds. The total distance traveled by the object in the 4.0 seconds is","correctAnswerText":"36m","incorrectText1":"24m","incorrectText2":"16m","incorrectText3":"4m"},{"itemId":"6B82C0083F2DE51F1489163","itemType":"BT_quizQuestion","questionText":"A ball dropped from a bridge takes 3.0 seconds to reach the water below. How far is the bridge above the water?","correctAnswerText":"44m","incorrectText1":"15m","incorrectText2":"29m","incorrectText3":"88m"},{"itemId":"E9939ADB1A6F977E587CBF1","itemType":"BT_quizQuestion","questionText":"A clam dropped by a sea gull takes 3.0 seconds to hit the ground. What is the sea gull's approximate height above the ground at the time the clam was dropped?","correctAnswerText":"45m","incorrectText1":"30m","incorrectText2":"14m","incorrectText3":"90m"},{"itemId":"80327B7753F6C05C4C14151","itemType":"BT_quizQuestion","questionText":"Which is a vector quantity?","correctAnswerText":"acceleration","incorrectText1":"time","incorrectText2":"speed","incorrectText3":"distance"},{"itemId":"6BF3C8F24A02651CCBE82A0","itemType":"BT_quizQuestion","questionText":"A rock falls freely from rest near the surface of a planet where the acceleration due to gravity is 4.0 meters per second2. What is the speed of this rock after it falls 32 meters?","correctAnswerText":"16 m/s","incorrectText1":"8 m/s","incorrectText2":"32 m/s","incorrectText3":"25 m/s"},{"itemId":"7B3FAD498F3F9C8405C057F","itemType":"BT_quizQuestion","questionText":"A 4.0-kilogram rock and a 1.0-kilogram stone fall freely from rest from a height of 100 meters. After they fall for 2.0 seconds, the ratio of the rock's speed to the stone's speed is","correctAnswerText":"1 : 1","incorrectText1":"1 : 2","incorrectText2":"2 : 1","incorrectText3":"4 : 1"},{"itemId":"3BD998ADF7918F4DF02614D","itemType":"BT_quizQuestion","questionText":"A stone is dropped from a bridge 45 meters above the surface of a river. Approximately how many seconds does the stone take to reach the water's surface?","correctAnswerText":"3.0 s","incorrectText1":"1.0 s","incorrectText2":"30 s","incorrectText3":"22 s"},{"itemId":"91AC31D87366E5800D92226","itemType":"BT_quizQuestion","questionText":"A car having an initial speed of 16 meters per second is uniformly brought to rest in 4.0 seconds. How far does the car travel during this 4.0-second interval?","correctAnswerText":"32m","incorrectText1":"82m","incorrectText2":"96m","incorrectText3":"4.0m"},{"itemId":"6368054A3CC7A29F2474F1D","itemType":"BT_quizQuestion","questionText":"A lamp placed on a table has a mass of 2 kilograms. If it has a weight of 20 newtons, what force does the table exert on the lamp?","correctAnswerText":"20 newtons","incorrectText1":"0 newtons","incorrectText2":"40 newtons","incorrectText3":"2 kg"},{"itemId":"50526BE0CDB0EAA7DBFC840","itemType":"BT_quizQuestion","questionText":"As the unbalanced force exerted on an object is increased, the object's acceleration will","correctAnswerText":"increase","incorrectText1":"decrease","incorrectText2":"stay the same","incorrectText3":"0"},{"itemId":"5A23FB32DADDC3521179A41","itemType":"BT_quizQuestion","questionText":"A student with a weight of 500 newtons sits on a chair. The chair exerts a force on the student of","correctAnswerText":"500 N","incorrectText1":"50 N","incorrectText2":"10 N","incorrectText3":"100 N"},{"itemId":"2996694A5D23F68C7F472A0","itemType":"BT_quizQuestion","questionText":"An unbalanced force of 2 newtons applied to a given mass produces an acceleration. If an unbalanced force of 1 newton is applied to the same mass, the acceleration produced will be","correctAnswerText":"one-half as much","incorrectText1":"twice as much","incorrectText2":"same","incorrectText3":"four times as much"},{"itemId":"E8DA8B1D8EBBAAF5CD63249","itemType":"BT_quizQuestion","questionText":"Which two terms represent a vector quantity and the scalar quantity of the vector's magnitude, respectively?","correctAnswerText":"displacement and distance","incorrectText1":"speed and time","incorrectText2":"weight and force","incorrectText3":"acceleration and velocity"},{"itemId":"B13A3141C881AA32E5538C3","itemType":"BT_quizQuestion","questionText":"A person kicks a 4.0-kilogram door with a 48-newton force causing the door to accelerate at 12 meters per second2. What is the magnitude of the force exerted by the door on the person?","correctAnswerText":"48N","incorrectText1":"24N","incorrectText2":"12N","incorrectText3":"4 N"},{"itemId":"5964985033D126788DC1730","itemType":"BT_quizQuestion","questionText":"Net force F causes mass m1 to accelerate to rate a. A net force of 3F causes mass m2 to accelerate at rate 2a. What is the ratio of mass m1 to mass m2 ?","correctAnswerText":"2 : 3","incorrectText1":"1 : 3","incorrectText2":"1 : 2","incorrectText3":"1 : 6"},{"itemId":"6B55569DCCD4CEAF0B1C103","itemType":"BT_quizQuestion","questionText":"A man weighs 900 newtons standing on a scale in a stationary elevator. If some time later the reading on the scale is 1200 newtons, the elevator must be moving with","correctAnswerText":"constant acceleration upward","incorrectText1":"constant acceleration downward","incorrectText2":"constant speed downward","incorrectText3":"constant speed upward"},{"itemId":"AC4FE5D9938DA84D178BBAE","itemType":"BT_quizQuestion","questionText":"A student weighing 500 newtons stands on a spring scale in an elevator. If the scale reads 520 newtons, the elevator must be","correctAnswerText":"accelerating upward","incorrectText1":"accelerating downward","incorrectText2":"moving upward at constant speed","incorrectText3":"moving downward at constant speed"},{"itemId":"DF9F60ED5C75051B0D466D4","itemType":"BT_quizQuestion","questionText":"When objects exert forces on each other, the total momentum of the system","correctAnswerText":"remains the same","incorrectText1":"decrease","incorrectText2":"increase","incorrectText3":"increase exponentially"},{"itemId":"C974446122EDDF7D3EF3D10","itemType":"BT_quizQuestion","questionText":"A reaction engine ejects hot gases in order to produce thrust. This is an example of conservation of","correctAnswerText":"momentum","incorrectText1":"charge","incorrectText2":"mass","incorrectText3":"energy"},{"itemId":"E52343363B441593390AC4A","itemType":"BT_quizQuestion","questionText":"Which of the following objects has the greatest momentum?","correctAnswerText":"a 20-kg object moving at 20 m/sec","incorrectText1":"a 1-kg object moving at 200 m/sec","incorrectText2":"a 10-kg object moving at 30 m/sec","incorrectText3":"a 100-kg object moving at 2 m/sec"},{"itemId":"CF3F1EBC854399AF985EC1D","itemType":"BT_quizQuestion","questionText":"The momentum of a rocket is equal to the","correctAnswerText":"product of its mass and velocity","incorrectText1":"sum of its mass and velocity","incorrectText2":"difference between mass and velocity","incorrectText3":"average of its mass and velocity"},{"itemId":"A95A6E33FBF41800229E758","itemType":"BT_quizQuestion","questionText":"A reaction engine acquires motion by ejecting hot gases in the opposite direction. This is an example of the law of","correctAnswerText":"conservation of momentum","incorrectText1":"conservation of heat","incorrectText2":"conservation of energy","incorrectText3":"conservation of heat"},{"itemId":"FBC810588CF0CF6B1C45519","itemType":"BT_quizQuestion","questionText":"The momentum of an object is the product of its","correctAnswerText":"mass and velocity","incorrectText1":"force and distance","incorrectText2":"mass and acceleration","incorrectText3":"force and displacement"},{"itemId":"7542D3493C389878446269E","itemType":"BT_quizQuestion","questionText":"The momentum of an object is the product of its","correctAnswerText":"mass and velocity","incorrectText1":"mass and acceleration","incorrectText2":"force and displacement","incorrectText3":"force and distance"},{"itemId":"8FFB74C6A70624858E292F7","itemType":"BT_quizQuestion","questionText":"What is the magnitude of the velocity of a 25-kilogram mass that is moving with a momentum of 100 kilogram-meters per second?","correctAnswerText":"4.0 m/s","incorrectText1":"2500 m/s","incorrectText2":"0.25 m/s","incorrectText3":"40 m/s"},{"itemId":"E781B6E43EA478D18E15073","itemType":"BT_quizQuestion","questionText":"Which pair of terms are vector quantities?","correctAnswerText":"momentum and acceleration","incorrectText1":"force and mass","incorrectText2":"distance and displacement","incorrectText3":"speed and velocity"},{"itemId":"A7A816CE82E2C5C0187E2E4","itemType":"BT_quizQuestion","questionText":"A force of 20 newtons is exerted on a cart for 10 seconds. How long must a 50-newton force act to produce the same impulse?","correctAnswerText":"5s","incorrectText1":"2s","incorrectText2":"10s","incorrectText3":"4s"},{"itemId":"02AE6D4B135065B41757097","itemType":"BT_quizQuestion","questionText":"In which of the following is no work done?","correctAnswerText":"none of the following","incorrectText1":"climbing stairs","incorrectText2":"lifting a book","incorrectText3":"pushing a shopping cart"},{"itemId":"28CE14353FB834A61777D4E","itemType":"BT_quizQuestion","questionText":"A force acting on an object does no work if","correctAnswerText":"the force is not in the direction of the object’s motion.","incorrectText1":"the force is greater than the force of friction.","incorrectText2":"the object accelerates.","incorrectText3":"a machine is used to move the object."},{"itemId":"CC04BA4E32F3DCD946A1356","itemType":"BT_quizQuestion","questionText":"What is the unit of work?","correctAnswerText":"joule","incorrectText1":"newton/meter","incorrectText2":"watt","incorrectText3":"all of the above"},{"itemId":"62FF31AF72D853FB5ABEBD0","itemType":"BT_quizQuestion","questionText":"The SI unit of power is the","correctAnswerText":"watt.","incorrectText1":"joule.","incorrectText2":"newton.","incorrectText3":"newton-meter."},{"itemId":"A746D27FB3B9DE6FFC2B250","itemType":"BT_quizQuestion","questionText":"The power of a machine measures","correctAnswerText":"its rate of doing work.","incorrectText1":"its strength.","incorrectText2":"the force it produces.","incorrectText3":"the work it does."},{"itemId":"D7DAF632D69C7E95C3E6B25","itemType":"BT_quizQuestion","questionText":"A machine is a device that can multiply","correctAnswerText":"force.","incorrectText1":"power.","incorrectText2":"work.","incorrectText3":"all"},{"itemId":"9D8268752AE68E806B640CC","itemType":"BT_quizQuestion","questionText":"When a machine does work, it cannot do which of the following?","correctAnswerText":"increase a force and increase the distance a force moves an object.","incorrectText1":"change the direction of a force.","incorrectText2":"increase a force and change the distance a force moves.","incorrectText3":"increase the distance a force moves and change the direction of a force."},{"itemId":"F1F5C7AAF478C3B6748CDBF","itemType":"BT_quizQuestion","questionText":"Expansion of a solid as it is heated is due to","correctAnswerText":"increased molecular action","incorrectText1":"increased molecular size","incorrectText2":"increased numbers of molecules","incorrectText3":"increased molecular mass"},{"itemId":"8C7CC9AC3DA804AE8D7852A","itemType":"BT_quizQuestion","questionText":"If 10 joules of work is completely converted into heat, the number of calories produced will be","correctAnswerText":"2.4 cal","incorrectText1":".24 cal","incorrectText2":"240 cal","incorrectText3":"24 cal"},{"itemId":"DCD979D06C1BAAF11B28F1A","itemType":"BT_quizQuestion","questionText":"If 10 joules of work is completely converted into heat, the number of calories produced will be","correctAnswerText":"2.4 cal","incorrectText1":".24 cal","incorrectText2":"240 cal","incorrectText3":"24 cal"},{"itemId":"AA759A5859FF624DE5DA577","itemType":"BT_quizQuestion","questionText":"Ten joules of mechanical energy is equivalent to how many calories of heat?","correctAnswerText":"2.4 calories","incorrectText1":"240 calories","incorrectText2":".24 calories","incorrectText3":"24 calories"},{"itemId":"A9E3D976829570863154051","itemType":"BT_quizQuestion","questionText":"The direction in which heat will  ow between two bodies depends on their","correctAnswerText":"temperature","incorrectText1":"total internal energy","incorrectText2":"specific heat","incorrectText3":"potential energy"},{"itemId":"AC286EFCFB97D36321100D3","itemType":"BT_quizQuestion","questionText":"Overcoming friction in moving an object requires 20 joules of work. How much heat is produced?","correctAnswerText":"4.8 cal","incorrectText1":"100 cal","incorrectText2":"24 cal","incorrectText3":".24 cal"},{"itemId":"2A80530D7498DED026D02FE","itemType":"BT_quizQuestion","questionText":"Which substance will require the least amount of heat in order to raise the temperature of a 1-gram sample 1 Celsius degree?","correctAnswerText":"lead","incorrectText1":"copper","incorrectText2":"aluminum","incorrectText3":"iron"},{"itemId":"81EEA8F37B907E41348958D","itemType":"BT_quizQuestion","questionText":"Brass expands when heated. This phenomenon is caused by","correctAnswerText":"an increase in the amplitude of vibration of the brass molecules","incorrectText1":"a decrease in the amplitude of vibration of the brass molecules","incorrectText2":"an increase in the mass of the brass molecules","incorrectText3":"a decrease in the mass of the brass molecules"},{"itemId":"2AADE1DB746DB2FC8B690CB","itemType":"BT_quizQuestion","questionText":"Work energy is completely converted to heat energy when all of the work done on an object is used to overcome","correctAnswerText":"friction","incorrectText1":"momentum","incorrectText2":"inertia","incorrectText3":"gravity"},{"itemId":"526D4D5011DD913F92F77AD","itemType":"BT_quizQuestion","questionText":"The amount of heat needed to raise the temperature of one gram of water one Celsius degree is a","correctAnswerText":"calorie","incorrectText1":"watt","incorrectText2":"joule","incorrectText3":"newton"},{"itemId":"BE679A13A8E63BE77434364","itemType":"BT_quizQuestion","questionText":"If the copper sulfate is sprinkled into a  ask of water, the water becomes uniformly tinted blue. This phenomenon is called","correctAnswerText":"diffusion","incorrectText1":"diffraction","incorrectText2":"reflection","incorrectText3":"condensation"},{"itemId":"433B0C994E1CD636F47CA1D","itemType":"BT_quizQuestion","questionText":"When salt is used on highways in winter, it melts the ice by","correctAnswerText":"lowering the melting point of the ice","incorrectText1":"adding heat to the ice","incorrectText2":"heating the surrounding air","incorrectText3":"raising the melting point of the ice"},{"itemId":"37DC313EE416F93670E882A","itemType":"BT_quizQuestion","questionText":"What amount of heat is required to melt 2 grams of iron at its melting point?","correctAnswerText":"16 cal","incorrectText1":"8 cal","incorrectText2":"1535 cal","incorrectText3":"3200 cal"},{"itemId":"ED2C867E2133CB051965622","itemType":"BT_quizQuestion","questionText":"A liquid is said to be supercooled when its temperature is","correctAnswerText":"below it freezing point","incorrectText1":"above its freezing point","incorrectText2":"below 0 C","incorrectText3":"at its freezing point"},{"itemId":"C6FCBE8A2CBE52AA17E076C","itemType":"BT_quizQuestion","questionText":"If 10 grams of each of the following metals were at their respective boiling points, which would require the least amount of heat to change it to a gas?","correctAnswerText":"zinc","incorrectText1":"copper","incorrectText2":"aluminum","incorrectText3":"iron"},{"itemId":"1578843E6DA6159E0FDF262","itemType":"BT_quizQuestion","questionText":"The random motion of molecules through a liquid is called","correctAnswerText":"diffusion","incorrectText1":"evaporation","incorrectText2":"regelation","incorrectText3":"sublimation"},{"itemId":"331EECA5CCCF51BBC81D3BF","itemType":"BT_quizQuestion","questionText":"Which substance listed below is a solid at a temperature of 1,300","correctAnswerText":"iron","incorrectText1":"copper","incorrectText2":"aluminum","incorrectText3":"zinc"},{"itemId":"C19BF180E79E47B824C93D0","itemType":"BT_quizQuestion","questionText":"The amount of heat required to melt 10.0 grams of zinc at its melting point is","correctAnswerText":"230 calories","incorrectText1":"419 calories","incorrectText2":"800 calories","incorrectText3":"4200 calories"},{"itemId":"27923578388C4CA95A4141D","itemType":"BT_quizQuestion","questionText":"When water is allowed to cool slowly to a temperature below its freezing point, but remains liquid, it has been","correctAnswerText":"supercooled","incorrectText1":"vaporized","incorrectText2":"frozen","incorrectText3":"condensed"},{"itemId":"86106B87688E9CBC14EA6DC","itemType":"BT_quizQuestion","questionText":"The amount of heat needed to vaporize 1.00 kilogram of ethanol at its boiling point is","correctAnswerText":"204,000 calories","incorrectText1":"25,000 calories","incorrectText2":"789 calories","incorrectText3":"78,000 calories"},{"itemId":"BE679A13A8E63BE77434364","itemType":"BT_quizQuestion","questionText":"If the copper sulfate is sprinkled into a  ask of water, the water becomes uniformly tinted blue. 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"questionText": "Which quantity is scalar?",
"correctAnswerText": "mass",
"incorrectText1": "force",
"incorrectText2": "momentum",
"incorrectText3": "acceleration"
}, {
"itemType": "YKXL5HKYGU3K19I",
"questionText": "What is the final speed of an object that starts from rest and accelerates uniformly at 4.0 meters per second2 over a distance of 8.0 meters?",
"correctAnswerText": "8.0 m/s",
"incorrectText1": "16 m/s",
"incorrectText2": "32 m/s",
"incorrectText3": "64 m/s"
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"questionText": "The components of a 15-meters-per-second velocity at an angle of 60.° above the horizontal are",
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"incorrectText1": "7.5 m/s vertical and 13 m/s horizontal",
"incorrectText2": "6.0 m/s vertical and 9.0 m/s horizontal",
"incorrectText3": "9.0 m/s vertical and 6.0 m/s horizontal"
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"questionText": "What is the time required for an object starting from rest to fall freely 500. meters near Earth’s surface?",
"correctAnswerText": "10.1 s",
"incorrectText1": "51.0 s",
"incorrectText2": "25.5 s",
"incorrectText3": "7.14 s"
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"questionText": "A baseball bat exerts a force of magnitude F on a ball. If the mass of the bat is three times the mass of the ball, the magnitude of the force of the ball on the bat is",
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"questionText": "A 2.0-kilogram mass is located 3.0 meters above the surface of Earth. What is the magnitude of Earth’s gravitational field strength at this location?",
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"incorrectText1": "4.9 N/kg",
"incorrectText2": "2.0 N/kg",
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"questionText": "A truck, initially traveling at a speed of 22 meters per second, increases speed at a constant rate of 2.4 meters per second2 for 3.2 seconds. What is the total distance traveled by the truck during this 3.2-second time interval?",
"correctAnswerText": "83 m",
"incorrectText1": "12 m",
"incorrectText2": "58 m",
"incorrectText3": "70. m"
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"questionText": "A 750-newton person stands in an elevator that is accelerating downward. The upward force of the elevator floor on the person must be",
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"incorrectText1": "equal to 0 N",
"incorrectText2": "equal to 750 N",
"incorrectText3": "greater than 750 N"
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"questionText": "A 3.0-kilogram object is acted upon by an impulse having a magnitude of 15 newton•seconds. What is the magnitude of the object’s change in momentum due to this impulse?",
"correctAnswerText": "15 kg•m/s",
"incorrectText1": "5.0 kg•m/s",
"incorrectText2": "3.0 kg•m/s",
"incorrectText3": "45 kg•m/s"
}, {
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"questionText": "An air bag is used to safely decrease the momentum of a driver in a car accident. The air bag reduces the magnitude of the force acting on the driver by",
"correctAnswerText": "increasing the length of time the force acts on the driver",
"incorrectText1": "decreasing the distance over which the force acts on the driver",
"incorrectText2": "increasing the rate of acceleration of the driver",
"incorrectText3": "decreasing the mass of the driver"
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"questionText": "An electron moving at constant speed produces",
"correctAnswerText": "both a magnetic and an electric field",
"incorrectText1": "a magnetic field, only",
"incorrectText2": "an electric field, only",
"incorrectText3": "neither a magnetic nor an electric field"
}, {
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"questionText": "Two pieces of flint rock produce a visible spark when they are struck together. During this process, mechanical energy is converted into",
"correctAnswerText": "electromagnetic energy and internal energy",
"incorrectText1": "nuclear energy and electromagnetic energy",
"incorrectText2": "internal energy and nuclear energy",
"incorrectText3": "elastic potential energy and nuclear energy"
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"questionText": "A 15-kilogram cart is at rest on a horizontal surface. A 5-kilogram box is placed in the cart. Compared to the mass and inertia of the cart, the cart-box system has",
"correctAnswerText": "more mass and more inertia",
"incorrectText1": "more mass and the same inertia",
"incorrectText2": "the same mass and more inertia",
"incorrectText3": "less mass and more inertia"
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"questionText": "Transverse waves are to radio waves as longitudinal waves are to",
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"incorrectText3": "ultraviolet waves"
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"questionText": "As a monochromatic light ray passes from air into water, two characteristics of the ray that will not change are",
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"incorrectText2": "wavelength and speed",
"incorrectText3": "frequency and speed"
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"questionText": "When a mass is placed on a spring with a spring constant of 60.0 newtons per meter, the spring is compressed 0.500 meter. How much energy is stored in the spring?",
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"incorrectText1": "60.0 J",
"incorrectText2": "30.0 J",
"incorrectText3": "15.0 J"
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"questionText": "A boy pushes his sister on a swing. What is the frequency of oscillation of his sister on the swing if the boy counts 90. complete swings in 300. seconds?",
"correctAnswerText": "0.30 Hz",
"incorrectText1": "2.0 Hz",
"incorrectText2": "1.5 Hz",
"incorrectText3": "18 Hz"
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"questionText": "An MP3 player draws a current of 0.120 ampere from a 3.00-volt battery. What is the total charge that passes through the player in 900. seconds?",
"correctAnswerText": "108 C",
"incorrectText1": "324 C",
"incorrectText2": "5.40 C",
"incorrectText3": "1.80 C"
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"questionText": "When x-ray radiation and infrared radiation are traveling in a vacuum, they have the same",
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"questionText": "As a car approaches a pedestrian crossing the road, the driver blows the horn. Compared to the sound wave emitted by the horn, the sound wave detected by the pedestrian has a",
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"incorrectText1": "higher frequency and a lower pitch",
"incorrectText2": "lower frequency and a higher pitch",
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"questionText": "When air is blown across the top of an open water bottle, air molecules in the bottle vibrate at a particular frequency and sound is produced. This phenomenon is called",
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"incorrectText1": "diffraction",
"incorrectText2": "refraction",
"incorrectText3": "the Doppler effect"
}, {
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"questionText": "An antibaryon composed of two antiup quarks and one antidown quark would have a charge of",
"correctAnswerText": "−1e",
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"incorrectText2": "0e",
"incorrectText3": "−3e"
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"itemType": "USLORHSX8WWYEGQ",
"questionText": "Which force is responsible for producing a stable nucleus by opposing the electrostatic force of repulsion between protons?",
"correctAnswerText": "strong",
"incorrectText1": "weak",
"incorrectText2": "frictional",
"incorrectText3": "gravitational"
}, {
"itemType": "XLVI06PD77FK7E5",
"questionText": "A shopping cart slows as it moves along a level floor. Which statement describes the energies of the cart?",
"correctAnswerText": "The kinetic energy decreases and the gravitational potential energy remains the same.",
"incorrectText1": "The kinetic energy increases and the gravitational potential energy remains the same.",
"incorrectText2": "The kinetic energy increases and the gravitational potential energy decreases.",
"incorrectText3": "The kinetic energy decreases and the gravitational potential energy increases."
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"itemType": "AAY72ZE3YSRW9FM",
"questionText": "A 25-gram paper cup falls from rest off the edge of a tabletop 0.90 meter above the floor. If the cup has 0.20 joule of kinetic energy when it hits the floor, what is the total amount of energy converted into internal (thermal) energy during the cup’s fall?",
"correctAnswerText": "0.02 J",
"incorrectText1": "0.22 J",
"incorrectText2": "2.2 J",
"incorrectText3": "220 J"
}, {
"itemType": "HLVQOFZNT76ZJ2G",
"questionText": "Which electron transition between the energy levels of hydrogen causes the emission of a photon of visible light?",
"correctAnswerText": "n = 5 to n = 2",
"incorrectText1": "n = 6 to n =5",
"incorrectText2": "n = 5 to n =6",
"incorrectText3": "n = 2 to n = 5"
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"questionText": "Which quantities are scalar?",
"correctAnswerText": "speed and work",
"incorrectText1": "velocity and force",
"incorrectText2": "distance and acceleration",
"incorrectText3": "momentum and power"
}, {
"itemType": "EXOGVT56OSTPSHJ",
"questionText": "A 3.00-kilogram mass is thrown vertically upward with an initial speed of 9.80 meters per second. What is the maximum height this object will reach? [Neglect friction.]",
"correctAnswerText": "4.90 m",
"incorrectText1": "1.00 m",
"incorrectText2": "9.80 m",
"incorrectText3": "19.6 m"
}, {
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"questionText": "A student throws a 5.0-newton ball straight up. What is the net force on the ball at its maximum height?",
"correctAnswerText": "5.0 N, down",
"incorrectText1": "0.0 N",
"incorrectText2": "5.0 N, up",
"incorrectText3": "9.8 N, down"
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"questionText": "A vertical spring has a spring constant of 100. newtons per meter. When an object is attached to the bottom of the spring, the spring changes from its unstretched length of 0.50 meter to a length of 0.65 meter. The magnitude of the weight of the attached object is",
"correctAnswerText": "15 N",
"incorrectText1": "1.1 N",
"incorrectText2": "50. N",
"incorrectText3": "65 N"
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"questionText": "A 1.5-kilogram cart initially moves at 2.0 meters per second. It is brought to rest by a constant net force in 0.30 second. What is the magnitude of the net force?",
"correctAnswerText": "10. N",
"incorrectText1": "0.40 N",
"incorrectText2": "0.90 N",
"incorrectText3": "15 N"
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"questionText": "Which characteristic of a light wave must increase as the light wave passes from glass into air?",
"correctAnswerText": "wavelength",
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"incorrectText2": "frequency",
"incorrectText3": "period"
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"questionText": "A 0.0600-kilogram ball traveling at 60.0 meters per second hits a concrete wall. What speed must a 0.0100-kilogram bullet have in order to hit the wall with the same magnitude of momentum as the ball?",
"correctAnswerText": "360. m/s",
"incorrectText1": "3.60 m/s",
"incorrectText2": "6.00 m/s",
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"questionText": "When two point charges are a distance d apart, the magnitude of the electrostatic force between them is F. If the distance between the point charges is increased to 3d, the magnitude of the electrostatic force between the two charges will be",
"correctAnswerText": "1/9F",
"incorrectText1": "1/3F",
"incorrectText2": "2F",
"incorrectText3": "4F"
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"questionText": "Which energy transformation occurs in an operating electric motor?",
"correctAnswerText": "electrical → mechanical",
"incorrectText1": "mechanical → electrical",
"incorrectText2": "chemical → electrical",
"incorrectText3": "electrical → chemical"
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"itemType": "KKD3SKLBVTGFS6Y",
"questionText": "A block slides across a rough, horizontal tabletop. As the block comes to rest, there is an increase in the block-tabletop system’s",
"correctAnswerText": "internal (thermal) energy",
"incorrectText1": "gravitational potential energy",
"incorrectText2": "elastic potential energy",
"incorrectText3": "kinetic energy"
}, {
"itemType": "8PI4WKJV8PCMVVV",
"questionText": "If several resistors are connected in series in an electric circuit, the potential difference across each resistor",
"correctAnswerText": "varies directly with its resistance",
"incorrectText1": "varies inversely with its resistance",
"incorrectText2": "varies inversely with the square of its resistance",
"incorrectText3": "is independent of its resistance"
}, {
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"questionText": "The amplitude of a sound wave is most closely related to the sound’s",
"correctAnswerText": "loudness",
"incorrectText1": "speed",
"incorrectText2": "wavelength",
"incorrectText3": "pitch"
}, {
"itemType": "UUJV4DBV47BP4O3",
"questionText": "A duck floating on a lake oscillates up and down 5.0 times during a 10.-second interval as a periodic wave passes by. What is the frequency of the duck’s oscillations?",
"correctAnswerText": "0.50 Hz",
"incorrectText1": "0.10 Hz",
"incorrectText2": "2.0 Hz",
"incorrectText3": "50. Hz"
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"questionText": "A gamma ray and a microwave traveling in a vacuum have the same",
"correctAnswerText": "speed",
"incorrectText1": "frequency",
"incorrectText2": "period",
"incorrectText3": "wavelength"
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"itemType": "PP23100KZM74VPE",
"questionText": "A student produces a wave in a long spring by vibrating its end. As the frequency of the vibration is doubled, the wavelength in the spring is",
"correctAnswerText": "halved",
"incorrectText1": "quartered",
"incorrectText2": "unchanged",
"incorrectText3": "doubled"
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"questionText": "As a longitudinal wave moves through a medium, the particles of the medium",
"correctAnswerText": "vibrate parallel to the direction of the wave’s propagation",
"incorrectText1": "vibrate perpendicular to the direction of the wave’s propagation",
"incorrectText2": "are transferred in the direction of the wave’s motion, only",
"incorrectText3": "are stationary"
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"questionText": "Wind blowing across suspended power lines may cause the power lines to vibrate at their natural frequency. This often produces audible sound waves. This phenomenon, often called an Aeolian harp, is an example of",
"correctAnswerText": "resonance",
"incorrectText1": "diffraction",
"incorrectText2": "the Doppler effect",
"incorrectText3": "refraction"
}, {
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"questionText": "What is the minimum energy required to ionize a hydrogen atom in the n = 3 state?",
"correctAnswerText": "1.51 eV",
"incorrectText1": "0.00 eV",
"incorrectText2": "0.66 eV",
"incorrectText3": "12.09 eV"
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"questionText": "Without air resistance, a kicked ball would reach a maximum height of 6.7 meters and land 38 meters away. With air resistance, the ball would travel",
"correctAnswerText": "less than 38 m horizontally and less than 6.7 m vertically",
"incorrectText1": "6.7 m vertically and more than 38 m horizontally",
"incorrectText2": "38 m horizontally and less than 6.7 m vertically",
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"questionText": "A car is moving with a constant speed of 20. meters per second. What total distance does the car travel in 2.0 minutes?",
"correctAnswerText": "2400 m",
"incorrectText1": "10. m",
"incorrectText2": "40. m",
"incorrectText3": "1200 m"
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"questionText": "An electric motor has a rating of 4.0 × 102 watts. How much time will it take for this motor to lift a 50.-kilogram mass a vertical distance of 8.0 meters? [Assume 100% efficiency.]",
"correctAnswerText": "9.8 s",
"incorrectText1": "0.98 s",
"incorrectText2": "98 s",
"incorrectText3": "980 s"
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"questionText": "A compressed spring in a toy is used to launch a 5.00-gram ball. If the ball leaves the toy with an initial horizontal speed of 5.00 meters per second, the minimum amount of potential energy stored in the compressed spring was",
"correctAnswerText": "0.0625 J",
"incorrectText1": "0.0125 J",
"incorrectText2": "0.0250 J",
"incorrectText3": "0.125 J"
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"questionText": "What is the quark composition of a proton?",
"correctAnswerText": "uud",
"incorrectText1": "udd",
"incorrectText2": "csb",
"incorrectText3": "uds"
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"questionText": "Which term identifies a scalar quantity?",
"correctAnswerText": "time",
"incorrectText1": "displacement",
"incorrectText2": "momentum",
"incorrectText3": " velocity"
}, {
"itemType": "YKXL5HKYGU3K19I",
"questionText": "Two 20.-newton forces act concurrently on  an object. What angle between these forces will produce a resultant force with the greatest magnitude?",
"correctAnswerText": "0°",
"incorrectText1": " 45°",
"incorrectText2": "90.°",
"incorrectText3": " 180.°"
}, {
"itemType": "GY922F9GMKG33F6",
"questionText": " Which object has the greatest inertia?",
"correctAnswerText": " a 1500-kg car at rest in a parking lot",
"incorrectText1": "a 0.010-kg bullet traveling at 90. m/s",
"incorrectText2": "a 30.-kg child traveling at 10. m/s on her bike",
"incorrectText3": "a 490-kg elephant walking with a speed of 1.0 m/s"
}, {
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"questionText": "An 8.0-newton wooden block slides across a horizontal wooden floor at constant velocity. What is the magnitude of the force of kinetic friction between the block and the floor?",
"correctAnswerText": " 2.4 N",
"incorrectText1": " 3.4 N",
"incorrectText2": "8.0 N",
"incorrectText3": "27 N"
}, {
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"questionText": "Which situation represents a person in equilibrium?",
"correctAnswerText": "a man standing still on a bathroom scale",
"incorrectText1": "a child gaining speed while sliding down a slide",
"incorrectText2": " a woman accelerating upward in an elevator",
"incorrectText3": " a teenager driving around a corner in his car"
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"questionText": "A rock is thrown straight up into the air. At the highest point of the rock’s path, the magnitude of the net force acting on the rock is",
"correctAnswerText": "the same as the magnitude of the rock’s weight",
"incorrectText1": "less than the magnitude of the rock’s weight, but greater than zero",
"incorrectText2": " greater than the magnitude of the rock’s weight",
"incorrectText3": "zero"
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"questionText": "A spring gains 2.34 joules of elastic potential energy as it is compressed 0.250 meter from its equilibrium position. What is the spring constant of this spring?",
"correctAnswerText": "74.9 N/m",
"incorrectText1": "9.36 N/m",
"incorrectText2": "18.7 N/m",
"incorrectText3": " 37.4 N/m"
}, {
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"questionText": "When a teacher shines light on a photocell attached to a fan, the blades of the fan turn. The brighter the light shone on the photocell, the faster the blades turn. Which energy conversion is illustrated by this demonstration?",
"correctAnswerText": "light → electrical → mechanical",
"incorrectText1": "light → thermal → mechanical",
"incorrectText2": "light → nuclear → thermal",
"incorrectText3": " light → mechanical → chemical"
}, {
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"questionText": "Which statement describes a characteristic common to all electromagnetic waves and mechanical waves?",
"correctAnswerText": " Both types of waves transfer energy",
"incorrectText1": "Both types of waves travel at the same speed.",
"incorrectText2": " Both types of waves require a material medium for propagation.",
"incorrectText3": " Both types of waves propagate in a vacuum."
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"questionText": "7 An electromagnetic wave is produced by charged particles vibrating at a rate of 3.9 × 108 vibrations per second. The electromagnetic wave is classified as",
"correctAnswerText": "a radio wave",
"incorrectText1": "an infrared wave",
"incorrectText2": " an x ray",
"incorrectText3": "visible light"
}, {
"itemType": "K44MG8ET3RHWJJQ",
"questionText": "The energy of a sound wave is most closely related to the wave’s",
"correctAnswerText": " amplitude",
"incorrectText1": "frequency",
"incorrectText2": "wavelength",
"incorrectText3": "speed"
}, {
"itemType": "E0TC6QUDUJ40AL2",
"questionText": "A sound wave traveling eastward through air causes the air molecules to",
"correctAnswerText": "vibrate east and west",
"incorrectText1": "vibrate north and south",
"incorrectText2": " move eastward, only",
"incorrectText3": " move northward, only"
}, {
"itemType": "5AHTK8MOSEY5GK5",
"questionText": "One vibrating 256-hertz tuning fork transfers energy to another 256-hertz tuning fork, causing the second tuning fork to vibrate. This phenomenon is an example of",
"correctAnswerText": "resonance",
"incorrectText1": "diffraction",
"incorrectText2": "reflection",
"incorrectText3": "refraction"
}, {
"itemType": "QLQ1ELH9KUEU7YR",
"questionText": "Sound waves are produced by the horn of a truck that is approaching a stationary observer.Compared to the sound waves detected by the driver of the truck, the sound waves detected by the observer have a greater",
"correctAnswerText": " frequency",
"incorrectText1": "wavelength",
"incorrectText2": "period",
"incorrectText3": "speed"
}, {
"itemType": "Y4G29E81L8TQ132",
"questionText": "The electronvolt is a unit of",
"correctAnswerText": " energy",
"incorrectText1": "charge",
"incorrectText2": "electric field strength",
"incorrectText3": " electric potential difference"
}, {
"itemType": "J7797GI7DNWRF75",
"questionText": "Which particle would produce a magnetic field?",
"correctAnswerText": "a moving charged particle",
"incorrectText1": "a neutral particle moving in a straight line",
"incorrectText2": "a neutral particle moving in a circle",
"incorrectText3": " a stationary charged particle"
}, {
"itemType": "6KVCEA4I38ZQTAT",
"questionText": " A physics student takes her pulse and determines that her heart beats periodically 60 times in 60 seconds. The period of her heartbeat is",
"correctAnswerText": "1 s",
"incorrectText1": "1 Hz",
"incorrectText2": "60 Hz",
"incorrectText3": " 60 s"
}, {
"itemType": "MJJCI61K3X8DUM4",
"questionText": "Moving 4.0 coulombs of charge through a circuit requires 48 joules of electric energy. What is the potential difference across this circuit?",
"correctAnswerText": "12 V",
"incorrectText1": "190 V",
"incorrectText2": "48 V",
"incorrectText3": "4.0 V"
}, {
"itemType": "5E9JJG8VV0R4GE5",
"questionText": "A photon is emitted as the electron in a hydrogen atom drops from the n = 5 energy level directly to the n = 3 energy level. What is the energy of the emitted photon?",
"correctAnswerText": "0.97 eV",
"incorrectText1": " 0.85 eV",
"incorrectText2": " 1.51 eV",
"incorrectText3": "2.05 eV"
}, {
"itemType": "A7YZEU8ND2LANXI",
"questionText": "In a process called pair production, an energetic gamma ray is converted into an electron and a positron. It is not possible for a gamma ray to be converted into two electrons because",
"correctAnswerText": "charge must be conserved",
"incorrectText1": "momentum must be conserved",
"incorrectText2": "mass-energy must be conserved",
"incorrectText3": " baryon number must be conserved"
}, {
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"questionText": "A baseball is thrown at an angle of 40.0° above the horizontal. The horizontal component of the baseball’s initial velocity is 12.0 meters per second. What is the magnitude of the ball’s initial velocity?",
"correctAnswerText": "15.7 m/s",
"incorrectText1": " 7.71 m/s",
"incorrectText2": "9.20 m/s",
"incorrectText3": " 18.7 m/s"
}, {
"itemType": "WG6AU8N7K75Z4KL",
"questionText": "Which object has the greatest inertia?",
"correctAnswerText": " a 15-kg mass traveling at 5.0 m/s",
"incorrectText1": " a 10.-kg mass traveling at 10. m/s",
"incorrectText2": "a 10.-kg mass traveling at 5.0 m/s",
"incorrectText3": "a 5.0-kg mass traveling at 15 m/s"
}, {
"itemType": "USLORHSX8WWYEGQ",
"questionText": "Which situation describes an object that has no unbalanced force acting on it?",
"correctAnswerText": "a hockey puck moving at constant velocity across ice",
"incorrectText1": "an apple in free fall",
"incorrectText2": "a satellite orbiting Earth",
"incorrectText3": " a laboratory cart moving down a frictionless 30.° incline"
}, {
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"questionText": "A child riding a bicycle at 15 meters per second accelerates at −3.0 meters per second2 for 4.0 seconds. What is the child’s speed at the end of this 4.0-second interval?",
"correctAnswerText": "3.0 m/s",
"incorrectText1": "12 m/s",
"incorrectText2": "27 m/s",
"incorrectText3": "7.0 m/s"
}, {
"itemType": "AAY72ZE3YSRW9FM",
"questionText": "An unbalanced force of 40. newtons keeps a  5.0-kilogram object traveling in a circle of radius 2.0 meters. What is the speed of the object?",
"correctAnswerText": " 4.0 m/s",
"incorrectText1": "8.0 m/s",
"incorrectText2": "2.0 m/s",
"incorrectText3": "16 m/s"
}, {
"itemType": "HLVQOFZNT76ZJ2G",
"questionText": "A 5.00-kilogram block slides along a horizontal, frictionless surface at 10.0 meters per second for 4.00 seconds. The magnitude of the block’s momentum is",
"correctAnswerText": " 50.0 kg•m/s",
"incorrectText1": "200. kg•m/s",
"incorrectText2": " 20.0 kg•m/s",
"incorrectText3": "12.5 kg•m/s"
}, {
"itemType": "BPTWCYPYPX7LKM7",
"questionText": "A 0.50-kilogram puck sliding on a horizontal shuffleboard court is slowed to rest by a frictional force of 1.2 newtons. What is the coefficient of kinetic friction between the puck and the surface of the shuffleboard court?",
"correctAnswerText": "0.24",
"incorrectText1": "0.42",
"incorrectText2": "0.6",
"incorrectText3": "4.1"
}, {
"itemType": "EXOGVT56OSTPSHJ",
"questionText": "On a small planet, an astronaut uses a vertical force of 175 newtons to lift an 87.5-kilogram boulder at constant velocity to a height of 0.350 meter above the planet’s surface. What is the magnitude of the gravitational field strength on the surface of the planet?",
"correctAnswerText": " 2.00 N/kg",
"incorrectText1": "0.500 N/kg",
"incorrectText2": " 9.81 N/kg",
"incorrectText3": "61.3 N/kg"
}, {
"itemType": "H3M6B02R96UG3FY",
"questionText": "A car uses its brakes to stop on a level road. During this process, there must be a conversion of kinetic energy into",
"correctAnswerText": " internal energy",
"incorrectText1": "light energy",
"incorrectText2": "nuclear energy",
"incorrectText3": " gravitational potential energy"
}, {
"itemType": "CEXN6PH66YIGZ9P",
"questionText": "Which change decreases the resistance of a piece of copper wire?",
"correctAnswerText": "decreasing the wire’s temperature",
"incorrectText1": "increasing the wire’s length",
"incorrectText2": "increasing the wire’s resistivity",
"incorrectText3": " decreasing the wire’s diameter"
}, {
"itemType": "FYMRXTNIT92NO3G",
"questionText": " How much work is done by the force lifting a  0.1-kilogram hamburger vertically upward at constant velocity 0.3 meter from a table?",
"correctAnswerText": " 0.3 J",
"incorrectText1": "0.03 J",
"incorrectText2": "0.1 J",
"incorrectText3": "0.4 J"
}, {
"itemType": "0ZQCO5086JV6D2T",
"questionText": "The wavelength of a wave doubles as it travels from medium Ainto medium B. Compared to the wave in medium A, the wave in medium B has",
"correctAnswerText": " twice the speed",
"incorrectText1": "half the speed",
"incorrectText2": " half the frequency",
"incorrectText3": " twice the frequency"
}, {
"itemType": "BPB92HRSAF1C42M",
"questionText": " The watt•second is a unit of",
"correctAnswerText": "energy",
"incorrectText1": "power",
"incorrectText2": "potential difference",
"incorrectText3": "electric field strength"
}, {
"itemType": "HHPQAMH7DC6EPY9",
"questionText": "Which quantity has both a magnitude and a direction?",
"correctAnswerText": " impulse",
"incorrectText1": "energy",
"incorrectText2": "power",
"incorrectText3": "work"
}, {
"itemType": "Y6ZRS4SKZL68BXB",
"questionText": "A tuning fork vibrates at a frequency of 512 hertz when struck with a rubber hammer. The sound produced by the tuning fork will travel through the air as a",
"correctAnswerText": " longitudinal wave with air molecules  vibrating parallel to the direction of travel",
"incorrectText1": "transverse wave with air molecules vibrating parallel to the direction of travel",
"incorrectText2": "longitudinal wave with air molecules vibrating perpendicular to the direction of travel",
"incorrectText3": "transverse wave with air molecules vibrating perpendicular to the direction of travel"
}, {
"itemType": "KKD3SKLBVTGFS6Y",
"questionText": " A 3-ohm resistor and a 6-ohm resistor are connected in parallel across a 9-volt battery. Which statement best compares the potential difference across each resistor?",
"correctAnswerText": "The potential difference across the 6-ohm resistor is the same as the potential difference across the 3-ohm resistor.",
"incorrectText1": " The potential difference across the 6-ohm resistor is twice as great as the potential  difference across the 3-ohm resistor.",
"incorrectText2": "The potential difference across the 6-ohm resistor is half as great as the potential  difference across the 3-ohm resistor.",
"incorrectText3": "The potential difference across the 6-ohm resistor is four times as great as the potential difference across the 3-ohm resistor."
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"questionText": "A 3.6-volt battery is used to operate a cell phone for 5.0 minutes. If the cell phone dissipates 0.064 watt of power during its operation, the current that passes through the phone is",
"correctAnswerText": "0.018 A",
"incorrectText1": " 5.3 A",
"incorrectText2": " 19 A",
"incorrectText3": "56 A"
}, {
"itemType": "V04KA3SO339ZRC0",
"questionText": "What is characteristic of both sound waves and electromagnetic waves?",
"correctAnswerText": " They transfer energy.",
"incorrectText1": "They require a medium.",
"incorrectText2": "They are mechanical waves.",
"incorrectText3": "They are longitudinal waves."
}, {
"itemType": "UUJV4DBV47BP4O3",
"questionText": "What is the wavelength of a 2.50-kilohertz sound wave traveling at 326 meters per second through air?",
"correctAnswerText": " 0.130 m",
"incorrectText1": " 1.30 m",
"incorrectText2": "7.67 m",
"incorrectText3": "130. m"
}, {
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"questionText": "Ultrasound is a medical technique that transmits sound waves through soft tissue in the human body. Ultrasound waves can break kidney stones into tiny fragments, making it easier for them to be excreted without pain. The shattering of kidney stones with specific frequencies of sound waves is an application of which wave phenomenon?",
"correctAnswerText": "resonance",
"incorrectText1": "the Doppler effect",
"incorrectText2": "reflection",
"incorrectText3": " refraction"
}, {
"itemType": "PP23100KZM74VPE",
"questionText": " While sitting in a boat, a fisherman observes that two complete waves pass by his position every 4 seconds. What is the period of these waves?",
"correctAnswerText": " 2 s",
"incorrectText1": " 0.5 s",
"incorrectText2": " 8 s",
"incorrectText3": " 4 s"
}, {
"itemType": "ZD5ZA4PTOJLOMUZ",
"questionText": "A wave passes through an opening in a barrier. The amount of diffraction experienced by the wave depends on the size of the opening and the wave’s",
"correctAnswerText": " wavelength",
"incorrectText1": "amplitude",
"incorrectText2": "velocity",
"incorrectText3": " phase"
}, {
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"questionText": "The length of a football field is closest to",
"correctAnswerText": "1000 dm",
"incorrectText1": " 1000 cm",
"incorrectText2": " 1000 km",
"incorrectText3": " 1000 mm"
}, {
"itemType": "NLBPULF6PZJ5M0U",
"questionText": " A student on an amusement park ride moves in a circular path with a radius of 3.5 meters once every 8.9 seconds. The student moves at an average speed of",
"correctAnswerText": " 2.5 m/s",
"incorrectText1": " 0.39 m/s",
"incorrectText2": "1.2 m/s",
"incorrectText3": " 4.3 m/s"
}, {
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"questionText": "When a 1.0-kilogram cart moving with a speed of 0.50 meter per second on a horizontal surface collides with a second 1.0-kilogram cart initially at rest, the carts lock together. What is the speed of the combined carts after the collision? [Neglect friction.]",
"correctAnswerText": "0.25 m/s",
"incorrectText1": "1.0 m/s",
"incorrectText2": " 0.50 m/s",
"incorrectText3": " 0 m/s"
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"questionText": "Two elevators, A and B, move at constant speed. Elevator B moves with twice the speed of elevator A. Elevator B weighs twice as much as elevator A. Compared to the power needed to lift elevator A, the power needed to lift elevator B is",
"correctAnswerText": "four times as great",
"incorrectText1": "the same",
"incorrectText2": "twice as great",
"incorrectText3": "half as great"
}, {
"itemType": "55ZNEVK6I9ZWO6D",
"questionText": "What is the maximum height to which a motor having a power rating of 20.4 watts can lift a 5.00-kilogram stone vertically in 10.0 seconds?",
"correctAnswerText": " 4.16 m",
"incorrectText1": " 0.0416 m",
"incorrectText2": "0.408 m",
"incorrectText3": "40.8 m"
}, {
"itemType": "DS2FJ7ZHHS9MRC3",
"questionText": "To increase the brightness of a desk lamp, a  student replaces a 50-watt incandescent  lightbulb with a 100-watt incandescent lightbulb. Compared to the 50-watt lightbulb, the 100-watt lightbulb has",
"correctAnswerText": " less resistance and draws more current",
"incorrectText1": "less resistance and draws less current",
"incorrectText2": " more resistance and draws more current",
"incorrectText3": "more resistance and draws less current"
}, {
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"questionText": "Electrons in excited hydrogen atoms are in the n = 3 energy level. How many different photon frequencies could be emitted as the atoms return to the ground state?",
"correctAnswerText": "3",
"incorrectText1": "1",
"incorrectText2": "2",
"incorrectText3": "4"
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{
"itemType": "8553A37AI0SANK8",
"questionText": " Scalar is to vector as",
"correctAnswerText": "speed is to velocity",
"incorrectText1": " displacement is to distance",
"incorrectText2": "displacement is to velocity",
"incorrectText3": "speed is to distance"
}, {
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"questionText": "A rock is dropped from a bridge. What happens to the magnitude of the acceleration and the speed of the rock as it falls? [Neglect friction.]",
"correctAnswerText": "Acceleration remains the same and speed increases.",
"incorrectText1": "Both acceleration and speed increase.",
"incorrectText2": " Both acceleration and speed remain the same.",
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}, {
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"questionText": "A student is standing in an elevator that is accelerating downward. The force that the student exerts on the floor of the elevator must be",
"correctAnswerText": "less than the weight of the student when at rest",
"incorrectText1": "greater than the weight of the student when at rest",
"incorrectText2": " less than the force of the floor on the student",
"incorrectText3": " greater than the force of the floor on the  student"
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"questionText": "The magnitude of the centripetal force acting on an object traveling in a horizontal, circular path will decrease if the",
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"questionText": "The centripetal force acting on the space shuttle as it orbits Earth is equal to the shuttle’s",
"correctAnswerText": "weight",
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"incorrectText2": " momentum",
"incorrectText3": " velocity"
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"questionText": " As a box is pushed 30. meters across a horizontal floor by a constant horizontal force of 25 newtons, the kinetic energy of the box increases by 300. joules. How much total internal energy is produced during this process?",
"correctAnswerText": "450 J",
"incorrectText1": "150 J",
"incorrectText2": " 250 J",
"incorrectText3": " 750 J"
}, {
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"questionText": " What is the power output of an electric motor that lifts a 2.0-kilogram block 15 meters vertically in 6.0 seconds?",
"correctAnswerText": "49 W",
"incorrectText1": "5.0 J",
"incorrectText2": " 5.0 W",
"incorrectText3": "49 J"
}, {
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"questionText": "What is the current through a wire if  240 coulombs of charge pass through the wire in 2.0 minutes?",
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"incorrectText2": "0.50 A",
"incorrectText3": "0.0083 A"
}, {
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"questionText": " An electric circuit consists of a variable resistor connected to a source of constant potential difference. If the resistance of the resistor is doubled, the current through the resistor is",
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"incorrectText1": "doubled",
"incorrectText2": " quartered",
"incorrectText3": "quadrupled"
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"questionText": "Circuit Ahas four 3.0-ohm resistors connected in series with a 24-volt battery, and circuit Bhas two 3.0-ohm resistors connected in series with a 24-volt battery. Compared to the total potential drop across circuit A, the total potential drop across circuit B is",
"correctAnswerText": "the same",
"incorrectText1": "one-half as great",
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"incorrectText3": " four times as great"
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"questionText": "How much total energy is dissipated in 10. seconds in a 4.0-ohm resistor with a current of 0.50 ampere?",
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"incorrectText1": " 2.5 J",
"incorrectText2": " 5.0 J",
"incorrectText3": "20. J"
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"questionText": "Moving a length of copper wire through a magnetic field may cause the wire to have a ",
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"incorrectText1": "lower temperature",
"incorrectText2": " lower resistivity",
"incorrectText3": "higher resistance"
}, {
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"questionText": " A pulse traveled the length of a stretched spring. The pulse transferred",
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"incorrectText2": " both energy and mass",
"incorrectText3": "neither energy nor mass"
}, {
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"questionText": "What is the period of a water wave if 4.0 complete waves pass a fixed point in 10. seconds?",
"correctAnswerText": "2.5 s",
"incorrectText1": "0.25 s",
"incorrectText2": "0.40 s",
"incorrectText3": "4.0 s"
}, {
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"questionText": "Which statement correctly describes one characteristic of a sound wave?",
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"questionText": "A 256-hertz vibrating tuning fork is brought near a nonvibrating 256-hertz tuning fork. The second tuning fork begins to vibrate. Which phenomenon causes the nonvibrating tuning fork to begin to vibrate?",
"correctAnswerText": "resonance",
"incorrectText1": "resistance",
"incorrectText2": "refraction",
"incorrectText3": "reflection"
}, {
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"questionText": "Astronauts traveling toward Earth in a fast-moving spacecraft receive a radio signal from an antenna on Earth. Compared to the frequency and wavelength of the radio signal emitted from the antenna, the radio signal received by the astronauts has a ",
"correctAnswerText": " higher frequency and a shorter wavelength",
"incorrectText1": "lower frequency and a shorter wavelength",
"incorrectText2": " lower frequency and a longer wavelength",
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"questionText": "On the atomic level, energy and matter exhibit the characteristics of",
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}, {
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"questionText": "Which particles are not affected by the strong force?",
"correctAnswerText": "electrons",
"incorrectText1": "hadrons",
"incorrectText2": "protons",
"incorrectText3": "neutrons"
}, {
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"questionText": "A 75-kilogram hockey player is skating across the ice at a speed of 6.0 meters per second. What is the magnitude of the average force required to stop the player in 0.65 second?",
"correctAnswerText": "690 N",
"incorrectText1": "120 N",
"incorrectText2": " 290 N",
"incorrectText3": "920 N"
}, {
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"questionText": "A deuterium nucleus consists of one proton and one neutron. The quark composition of a deuterium nucleus is",
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"questionText": "A baseball player runs 27.4 meters from the batter’s box to first base, overruns first base by 3.0 meters, and then returns to first base. Compared to the total distance traveled by the player, the magnitude of the player’s total displacement from the batter’s box is",
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"incorrectText2": "3.0 m longer",
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"questionText": "A motorboat, which has a speed of 5.0 meters per second in still water, is headed east as it crosses a river flowing south at 3.3 meters per second. What is the magnitude of the boat’s resultant velocity with respect to the starting point?",
"correctAnswerText": " 6.0 m/s",
"incorrectText1": " 3.3 m/s",
"incorrectText2": "5.0 m/s",
"incorrectText3": "8.3 m/s"
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"questionText": "A car traveling on a straight road at 15.0 meters per second accelerates uniformly to a speed of 21.0 meters per second in 12.0 seconds. The total distance traveled by the car in this 12.0-second time interval is",
"correctAnswerText": "216 m",
"incorrectText1": " 36.0 m",
"incorrectText2": " 180. m",
"incorrectText3": " 252 m"
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"questionText": " A 0.149-kilogram baseball, initially moving at 15 meters per second, is brought to rest in  0.040 second by a baseball glove on a catcher’s hand. The magnitude of the average force exerted on the ball by the glove is",
"correctAnswerText": "56 N",
"incorrectText1": "2.2 N",
"incorrectText2": "2.9 N",
"incorrectText3": "17 N"
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"questionText": " Which body is in equilibrium?",
"correctAnswerText": " a block sliding at constant velocity across a tabletop",
"incorrectText1": "a satellite moving around Earth in a circular orbit",
"incorrectText2": "a cart rolling down a frictionless incline",
"incorrectText3": " an apple falling freely toward the surface of Earth"
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"questionText": " A student pulls a 60.-newton sled with a force having a magnitude of 20. newtons. What is the magnitude of the force that the sled exerts on the student?",
"correctAnswerText": " 20. N",
"incorrectText1": " 40. N",
"incorrectText2": " 60. N",
"incorrectText3": "80. N"
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"questionText": "A ball is thrown vertically upward with an initial velocity of 29.4 meters per second. What is the maximum height reached by the ball? [Neglect friction.]",
"correctAnswerText": " 44.1 m",
"incorrectText1": " 14.7 m",
"incorrectText2": "29.4 m",
"incorrectText3": " 88.1 m"
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"questionText": "A 3.1-kilogram gun initially at rest is free to move. When a 0.015-kilogram bullet leaves the gun with a speed of 500. meters per second, what is the speed of the gun?",
"correctAnswerText": "2.4 m/s",
"incorrectText1": "0.0 m/s",
"incorrectText2": "7.5 m/s",
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"questionText": "Magnetic fields are produced by particles that are",
"correctAnswerText": "moving and charged",
"incorrectText1": " moving and neutral",
"incorrectText2": "stationary and charged",
"incorrectText3": "stationary and neutral"
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"questionText": "A charge of 30. coulombs passes through a  24-ohm resistor in 6.0 seconds. What is the current through the resistor?",
"correctAnswerText": "5.0 A",
"incorrectText1": " 1.3 A",
"incorrectText2": " 7.5 A",
"incorrectText3": "4.0 A"
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"questionText": "The wavelength of this wave is equal to the distance between points",
"correctAnswerText": "A and C",
"incorrectText1": "A and B",
"incorrectText2": "B and C",
"incorrectText3": "B and E"
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"questionText": "Playing a certain musical note on a trumpet causes the spring on the bottom of a nearby snare drum to vibrate. This phenomenon is an example of",
"correctAnswerText": "resonance",
"incorrectText1": "refraction",
"incorrectText2": " reflection",
"incorrectText3": " diffraction"
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"questionText": "In a vacuum, all electromagnetic waves have the same",
"correctAnswerText": "speed",
"incorrectText1": "phase",
"incorrectText2": "frequency",
"incorrectText3": "wavelength"
}, {
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"questionText": " A particle that is composed of two up quarks and one down quark is a  ",
"correctAnswerText": "proton",
"incorrectText1": "meson",
"incorrectText2": "neutron",
"incorrectText3": " positron"
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"questionText": " A helium atom consists of two protons, two electrons, and two neutrons. In the helium atom, the strong force is a fundamental interaction between the",
"correctAnswerText": "neutrons and protons",
"incorrectText1": " electrons, only",
"incorrectText2": "electrons and protons",
"incorrectText3": "neutrons and electrons"
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"questionText": " Compared to the mass and charge of a proton, an antiproton has",
"correctAnswerText": "the same mass and the opposite charge",
"incorrectText1": "the same mass and the same charge",
"incorrectText2": " greater mass and the same charge",
"incorrectText3": "greater mass and the opposite charge"
}, {
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"questionText": "As viewed from Earth, the light from a star has lower frequencies than the light emitted by the star because the star is",
"correctAnswerText": "moving away from Earth",
"incorrectText1": " moving toward Earth",
"incorrectText2": " stationary",
"incorrectText3": ""
}, {
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"questionText": "The total work done in lifting a typical high school physics textbook a vertical distance of 0.10 meter is approximately",
"correctAnswerText": "1.5 J",
"incorrectText1": " 0.15 J",
"incorrectText2": "15 J",
"incorrectText3": "150 J"
}, {
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"questionText": "Which electrical unit is equivalent to one joule?",
"correctAnswerText": "coulomb•volt",
"incorrectText1": "volt per meter",
"incorrectText2": "ampere•volt",
"incorrectText3": "volt per coulomb"
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"questionText": "A small electric motor is used to lift a  0.50-kilogram mass at constant speed. If the mass is lifted a vertical distance of 1.5 meters in 5.0 seconds, the average power developed by the motor is",
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"incorrectText1": " 0.15 W",
"incorrectText2": " 3.8 W",
"incorrectText3": " 7.5 W"
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"questionText": "A child, starting from rest at the top of a playground slide, reaches a speed of 7.0 meters per second at the bottom of the slide. What is the vertical height of the slide? [Neglect friction.]",
"correctAnswerText": " 2.5 m",
"incorrectText1": " 0.71 m",
"incorrectText2": "1.4 m",
"incorrectText3": " 3.5 m"
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"questionText": " A 5.0-kilogram sphere, starting from rest, falls freely 22 meters in 3.0 seconds near the surface of a planet. Compared to the acceleration due to gravity near Earth’s surface, the acceleration due to gravity near the surface of the planet is approximately",
"correctAnswerText": "one-half as great",
"incorrectText1": "the same",
"incorrectText2": "twice as great",
"incorrectText3": "four times as great"
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"questionText": "A 15.0-kilogram mass is moving at 7.50 meters per second on a horizontal, frictionless surface. What is the total work that must be done on the mass to increase its speed to 11.5 meters per second?",
"correctAnswerText": "570. J",
"incorrectText1": "120. J",
"incorrectText2": "422 J",
"incorrectText3": "992 J"
}, {
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"questionText": "A 0.686-meter-long wire has a cross-sectional area of 8.23 × 10–6 meter2 and a resistance of 0.125 ohm at 20° Celsius. This wire could be made of",
"correctAnswerText": "nichrome",
"incorrectText1": "aluminum",
"incorrectText2": "copper",
"incorrectText3": "tungsten"
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"questionText": "Increasing the amplitude of a sound wave produces a sound with",
"correctAnswerText": "greater loudness",
"incorrectText1": "lower speed",
"incorrectText2": "higher pitch",
"incorrectText3": "shorter wavelength"
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"questionText": "The product of a wave’s frequency and its period is",
"correctAnswerText": "one",
"incorrectText1": "its velocity",
"incorrectText2": "its wavelength",
"incorrectText3": "Planck’s constant"
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"questionText": "A periodic wave having a frequency of 5.0 hertz and a speed of 10. meters per second has a wavelength of",
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"incorrectText2": "5.0 m",
"incorrectText3": "50. m"
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"questionText": "Resonance occurs when one vibrating object transfers energy to a second object causing it to vibrate. The energy transfer is most efficient when, compared to the first object, the second object has the same natural",
"correctAnswerText": "frequency",
"incorrectText1": "loudness",
"incorrectText2": "amplitude",
"incorrectText3": "speed"
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"questionText": "A variable-frequency light source emits a series of photons. As the frequency of the photon increases, what happens to the energy and wavelength of the photon?",
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"questionText": "A joule is equivalent to a",
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"incorrectText3": "both attractive and repulsive"
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"questionText": "A particle unaffected by an electric field could have a quark composition of",
"correctAnswerText": "css",
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"incorrectText3": "uud"
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"questionText": "An electrical appliance draws 9.0 amperes of current when connected to a 120-volt source of potential difference. What is the total amount of power dissipated by this appliance?",
"correctAnswerText": "1100 W",
"incorrectText1": "13 W",
"incorrectText2": "110 W",
"incorrectText3": "130 W"
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"questionText": "A sound wave has a wavelength of 5.5 meters as it travels through air at STP. What is the wavelength of this sound in a medium where its speed is 1324 meters per second?",
"correctAnswerText": "22 m",
"incorrectText1": "1.4 m",
"incorrectText2": "2.2 m",
"incorrectText3": "14 m"
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As the car speeds up going away from a stationary spectator, the sound wave detected by the spectator","correctAnswerText":"decreases in amplitude and decreases in frequency","incorrectText1":"decreases in amplitude and increases in frequency","incorrectText2":"increases in amplitude and decreases in frequency","incorrectText3":"increases in amplitude and increases in frequency"}, {"itemType":"PP23100KZM74VPE","questionText":"An electron in a mercury atom drops from energy level f to energy level c by emitting a photon having an energy of","correctAnswerText":"2.84 eV","incorrectText1":"8.20 eV","incorrectText2":"5.52 eV","incorrectText3":"2.68 eV"}, {"itemType":"ZD5ZA4PTOJLOMUZ","questionText":"Moving electrons are found to exhibit properties of","correctAnswerText":"both particles and waves","incorrectText1":"particles, only","incorrectText2":"waves, only","incorrectText3":"neither particles nor waves"}, {"itemType":"JCYXI63DJ16TQE0","questionText":"The weight of a typical high school physics student is closest to","correctAnswerText":"600 N","incorrectText1":"1500 N","incorrectText2":"120 N","incorrectText3":"60 N"}, {"itemType":"VP0PAKNO4TMFZSX","questionText":"A child does 0.20 joule of work to compress the spring in a pop-up toy. If the mass of the toy is 0.010 kilogram, what is the maximum vertical height that the toy can reach after the spring is released?","correctAnswerText":"2.0 m","incorrectText1":"20. m","incorrectText2":"0.20 m","incorrectText3":"0.020 m"}, {"itemType":"55ZNEVK6I9ZWO6D","questionText":"What is the current in a 100.-ohm resistor connected to a 0.40-volt source of potential difference?","correctAnswerText":"4.0 Ma","incorrectText1":"250 mA","incorrectText2":"40. mA","incorrectText3":"2.5 mA"}, {"itemType":"DS2FJ7ZHHS9MRC3","questionText":"A 150-watt lightbulb is brighter than a 60.-watt lightbulb when both are operating at a potential difference of 110 volts. Compared to the resistance of and the current drawn by the 150-watt lightbulb, the 60.-watt lightbulb has","correctAnswerText":"more resistance and draws less current","incorrectText1":"less resistance and draws more current","incorrectText2":"less resistance and draws less current","incorrectText3":"more resistance and draws more current"}, {"itemType":"FHZABM4FBTDKYNT","questionText":"What is the minimum equipment needed to determine the power dissipated in a resistor of unknown value?","correctAnswerText":"a voltmeter and an ammeter, only","incorrectText1":"a voltmeter, only","incorrectText2":"an ammeter, only","incorrectText3":"a voltmeter, an ammeter, and a stopwatch"}, {"itemType":"DXSCDNW2RD05PQI","questionText":"The speedometer in a car does not measure the car’s velocity because velocity is a","correctAnswerText":"vector quantity and has a direction associated with it","incorrectText1":"vector quantity and does not have a direction associated with it","incorrectText2":"scalar quantity and has a direction associated with it","incorrectText3":"scalar quantity and does not have a direction associated with it"}, {"itemType":"VCARCL5DRVYOE9P","questionText":"A projectile launched at an angle of 45° above the horizontal travels through the air. Compared to the projectile’s theoretical path with no air friction, the actual trajectory of the projectile with air friction is","correctAnswerText":"lower and shorter","incorrectText1":"lower and longer","incorrectText2":"higher and shorter","incorrectText3":"higher and longer"}, {"itemType":"DR9SERCNMCVABGV","questionText":"Cart A has a mass of 2 kilograms and a speed of 3 meters per second. Cart B has a mass of 3 kilograms and a speed of 2 meters per second. Compared to the inertia and magnitude of momentum of cart A, cart B has","correctAnswerText":"greater inertia and the same magnitude of momentum","incorrectText1":"the same inertia and a smaller magnitude of momentum","incorrectText2":"the same inertia and the same magnitude of momentum","incorrectText3":"greater inertia and a smaller magnitude of momentum"}, {"itemType":"99K0OLTLQOOO4I5","questionText":"Two stones, A and B, are thrown horizontally from the top of a cliff. Stone A has an initial speed of 15 meters per second and stone B has an initial speed of 30. meters per second. Compared to the time it takes stone A to reach the ground, the time it takes stone B to reach the ground is","correctAnswerText":"the same","incorrectText1":"twice as great","incorrectText2":"half as great","incorrectText3":"four times as great"}, {"itemType":"0RR21EAVKBMQ72Z","questionText":"A 1200-kilogram space vehicle travels at 4.8 meters per second along the level surface of Mars. If the magnitude of the gravitational field strength on the surface of Mars is 3.7 newtons per kilogram, the magnitude of the normal force acting on the vehicle is","correctAnswerText":"4400 N","incorrectText1":"320 N","incorrectText2":"930 N","incorrectText3":"5800 N"}, {"itemType":"SXOXMHV5JKF18LC","questionText":"An airplane flies with a velocity of 750. kilometers per hour, 30.0° south of east. What is the magnitude of the eastward component of the plane’s velocity?","correctAnswerText":"650. km/h","incorrectText1":"866 km/h","incorrectText2":"433 km/h","incorrectText3":"375 km/h"}, {"itemType":"NAN2WYSD5M3LXBN","questionText":"An 80-kilogram skier slides on waxed skis along a horizontal surface of snow at constant velocity while pushing with his poles. What is the horizontal component of the force pushing him forward?","correctAnswerText":"40 N","incorrectText1":"0.05 N","incorrectText2":"0.4 N","incorrectText3":"4 N"}, {"itemType":"85NON9BAU2AR6HF","questionText":"A 0.45-kilogram football traveling at a speed of 22 meters per second is caught by an 84-kilogram stationary receiver. If the football comes to rest in the receiver’s arms, the magnitude of the impulse imparted to the receiver by the ball is","correctAnswerText":"9.9 N•s","incorrectText1":"1800 N•s","incorrectText2":"4.4 N•s","incorrectText3":"3.8 N•s"}, {"itemType":"BFGLSQMF5APDDL5","questionText":"A carpenter hits a nail with a hammer. Compared to the magnitude of the force the hammer exerts on the nail, the magnitude of the force the nail exerts on the hammer during contact is","correctAnswerText":"the same","incorrectText1":"less","incorrectText2":"greater","incorrectText3":""}, {"itemType":"Z2I7G984RII3Q5K","questionText":"An electric circuit contains a variable resistor connected to a source of constant voltage. As the resistance of the variable resistor is increased, the power dissipated in the circuit","correctAnswerText":"decreases","incorrectText1":"increases","incorrectText2":"remains the same","incorrectText3":""}, {"itemType":"5K0CGYDSFF2B5FD","questionText":"A circuit consists of a resistor and a battery. Increasing the voltage of the battery while keeping the temperature of the circuit constant would result in an increase in","correctAnswerText":"current, only","incorrectText1":"resistance, only","incorrectText2":"both current and resistance","incorrectText3":"neither current nor resistance"}, {"itemType":"0S2GJW7975DU7LS","questionText":"The time required for a wave to complete one full cycle is called the wave’s","correctAnswerText":"period","incorrectText1":"frequency","incorrectText2":"velocity","incorrectText3":"wavelength"}, {"itemType":"ORSHYBY66EMSW55","questionText":"An electromagnetic AM-band radio wave could have a wavelength of","correctAnswerText":"500 m","incorrectText1":"0.005 m","incorrectText2":"5 m","incorrectText3":"5 000 000 m"}, {"itemType":"I3ELSRC87JU9905","questionText":"When a light wave enters a new medium and is refracted, there must be a change in the light wave’s","correctAnswerText":"speed","incorrectText1":"color","incorrectText2":"frequency","incorrectText3":"period"}, {"itemType":"024S2SOHE5RGJYO","questionText":"Wave X travels eastward with frequency f and amplitude A. Wave Y, traveling in the same medium, interacts with wave X and produces a standing wave. Which statement about wave Y is correct?","correctAnswerText":"Wave Y must have a frequency of f, an amplitude of A, and be traveling westward.","incorrectText1":"Wave Y must have a frequency of f, an amplitude of A, and be traveling eastward.","incorrectText2":"Wave Y must have a frequency of 2f, an amplitude of 3A, and be traveling eastward.","incorrectText3":"Wave Y must have a frequency of 3f, an amplitude of 2A, and be traveling westward."}, {"itemType":"BU1NCY32KRLWLOH","questionText":"A car’s horn is producing a sound wave having a constant frequency of 350 hertz. If the car moves toward a stationary observer at constant speed, the frequency of the car’s horn detected by this observer may be","correctAnswerText":"380 Hz","incorrectText1":"320 Hz","incorrectText2":"330 Hz","incorrectText3":"350 Hz"}, {"itemType":"XZ3WKOZ2AH5S4PT","questionText":"A mercury atom in the ground state absorbs 20.00 electronvolts of energy and is ionized by losing an electron. How much kinetic energy does this electron have after the ionization?","correctAnswerText":"9.62 eV","incorrectText1":"6.40 eV","incorrectText2":"10.38 eV","incorrectText3":"13.60 eV"}, {"itemType":"OYOPO4YUABEOV5J","questionText":"Which fundamental force is primarily responsible for the attraction between protons and electrons?","correctAnswerText":"electromagnetic","incorrectText1":"strong","incorrectText2":"weak","incorrectText3":"gravitational"}, {"itemType":"74SLBYX5EFRFQV7","questionText":"Which is a vector quantity?","correctAnswerText":"displacement","incorrectText1":"speed","incorrectText2":"work","incorrectText3":"mass"}, {"itemType":"XV0ZT4FHIAGUK60","questionText":"A race car starting from rest accelerates uniformly at a rate of 4.90 meters per second2. What is the car’s speed after it has traveled 200. meters?","correctAnswerText":"44.3 m/s","incorrectText1":"1960 m/s","incorrectText2":"62.6 m/s","incorrectText3":"31.3 m/s"}, {"itemType":"5BDNYTIIR6PRI5O","questionText":"A ball is thrown straight downward with a speed of 0.50 meter per second from a height of 4.0 meters. What is the speed of the ball 0.70 second after it is released? [Neglect friction.]","correctAnswerText":"7.4 m/s","incorrectText1":"0.50 m/s","incorrectText2":"9.8 m/s","incorrectText3":"15 m/s"}, {"itemType":"0P1AURZ9I1I79FY","questionText":"A soccer player kicks a ball with an initial velocity of 10. meters per second at an angle of 30.° above the horizontal. The magnitude of the horizontal component of the ball’s initial velocity is","correctAnswerText":"8.7 m/s","incorrectText1":"5.0 m/s","incorrectText2":"9.8 m/s","incorrectText3":"10. m/s"}, {"itemType":"7URL948HFH3GPTC","questionText":"Which object has the greatest inertia?","correctAnswerText":"a 20.0-kg mass moving at 1.00 m/s","incorrectText1":"a 5.00-kg mass moving at 10.0 m/s","incorrectText2":"a 10.0-kg mass moving at 1.00 m/s","incorrectText3":"a 15.0-kg mass moving at 10.0 m/s"}, {"itemType":"413L0WXGYD7P5LU","questionText":"Two spheres, A and B, are simultaneously projected horizontally from the top of a tower. Sphere A has a horizontal speed of 40. meters per second and sphere B has a horizontal speed of 20. meters per second. Which statement best describes the time required for the spheres to reach the ground and the horizontal distance they travel? [Neglect friction and assume the ground is level.]","correctAnswerText":"Both spheres hit the ground at the same time, but sphere A lands twice as far as sphere B from the base of the tower.","incorrectText1":"Both spheres hit the ground at the same time and at the same distance from the base of the tower.","incorrectText2":"Both spheres hit the ground at the same time, but sphere B lands twice as far as sphere A from the base of the tower.","incorrectText3":"Sphere A hits the ground before sphere B, and sphere A lands twice as far as sphere B from the base of the tower."}, {"itemType":"BDIU47S418GFISE","questionText":"A car’s performance is tested on various horizontal road surfaces. The brakes are applied, causing the rubber tires of the car to slide along the road without rolling. The tires encounter the greatest force of friction to stop the car on","correctAnswerText":"dry concrete","incorrectText1":"dry asphalt","incorrectText2":"wet concrete","incorrectText3":"wet asphalt"}, {"itemType":"FQECJJ87SAHEX03","questionText":"A 6.0-kilogram block, sliding to the east across a horizontal, frictionless surface with a momentum of 30. kilogram•meters per second, strikes an obstacle. The obstacle exerts an impulse of 10. newton•seconds to the west on the block. The speed of the block after the collision is","correctAnswerText":"3.3 m/s","incorrectText1":"1.7 m/s","incorrectText2":"5.0 m/s","incorrectText3":"20. m/s"}, {"itemType":"NKLNKG96VJZFY29","questionText":"If a 65-kilogram astronaut exerts a force with a magnitude of 50. newtons on a satellite that she is repairing, the magnitude of the force that the satellite exerts on her is","correctAnswerText":"50. N","incorrectText1":"0 N","incorrectText2":"50. N less than her weight","incorrectText3":"50. N more than her weight"}, {"itemType":"LOU0U6SR6KSI51D","questionText":"A 1.0-kilogram laboratory cart moving with a velocity of 0.50 meter per second due east collides with and sticks to a similar cart initially at rest. After the collision, the two carts move off together with a velocity of 0.25 meter per second due east. The total momentum of this frictionless system is","correctAnswerText":"the same before and after the collision","incorrectText1":"zero before the collision","incorrectText2":"zero after the collision","incorrectText3":"greater before the collision than after the collision"}, {"itemType":"8KHKFDP7AKKO6QB","questionText":"Student A lifts a 50.-newton box from the floor to a height of 0.40 meter in 2.0 seconds. Student B lifts a 40.-newton box from the floor to a height of 0.50 meter in 1.0 second. Compared to student A, student B does","correctAnswerText":"the same work but develops more power","incorrectText1":"the same work but develops less power","incorrectText2":"more work but develops less power","incorrectText3":"less work but develops more power"}, {"itemType":"7Y72QCG1CI1B1YI","questionText":"The work done on a slingshot is 40.0 joules to pull back a 0.10-kilogram stone. If the slingshot projects the stone straight up in the air, what is the maximum height to which the stone will rise? [Neglect friction.]","correctAnswerText":"41 m","incorrectText1":"0.41 m","incorrectText2":"410 m","incorrectText3":"4.1 m"}]
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{
"itemType": "8553A37AI0SANK8",
"questionText": "Which is not a vector quantity?",
"correctAnswerText": "electric charge",
"incorrectText1": "magnetic field strength",
"incorrectText2": "velocity",
"incorrectText3": "displacement"
}, {
"itemType": "YKXL5HKYGU3K19I",
"questionText": "As the angle between two concurrent forces decreases, the magnitude of the force required to produce equilibrium",
"correctAnswerText": "increases",
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"incorrectText2": "remains the same",
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"questionText": "A child walks 5.0 meters north, then 4.0 meters east, and finally 2.0 meters south. What is the magnitude of the resultant displacement of the child after the entire walk?",
"correctAnswerText": "5.0 m",
"incorrectText1": "1.0 m",
"incorrectText2": "3.0 m",
"incorrectText3": "11.0 m"
}, {
"itemType": "UNIMIO4TFZNMGIG",
"questionText": "Which situation will produce the greatest change of momentum for a 1.0-kilogram cart?",
"correctAnswerText": "applying a net force of 5.0 N for 2.0 s",
"incorrectText1": "accelerating it from rest to 3.0 m/s",
"incorrectText2": "accelerating it from 2.0 m/s to 4.0 m/s",
"incorrectText3": "applying a net force of 10.0 N for 0.5 s"
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"questionText": "A horizontal force of 5.0 newtons acts on a 3.0-kilogram mass over a distance of 6.0 meters along a horizontal, frictionless surface. What is the change in kinetic energy of the mass during its movement over the 6.0-meter distance?",
"correctAnswerText": "30. J",
"incorrectText1": "6.0 J",
"incorrectText2": "15 J",
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"questionText": "The current through a 10.-ohm resistor is 1.2 amperes. What is the potential difference across the resistor?",
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"incorrectText1": "8.3 V",
"incorrectText2": "14 V",
"incorrectText3": "120 V"
}, {
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"questionText": "What is the total current in a circuit consisting of six operating 100-watt lamps connected in parallel to a 120-volt source?",
"correctAnswerText": "5:00 AM",
"incorrectText1": "20 A",
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"questionText": "A microwave and an x ray are traveling in a vacuum. Compared to the wavelength and period of the microwave, the x ray has a wavelength that is",
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"incorrectText1": "longer and a period that is shorter",
"incorrectText2": "longer and a period that is longer",
"incorrectText3": "shorter and a period that is longer"
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"questionText": "Which type of wave requires a material medium through which to travel?",
"correctAnswerText": "sound",
"incorrectText1": "electromagnetic",
"incorrectText2": "infrared",
"incorrectText3": "radio"
}, {
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"questionText": "A car traveling at 70 kilometers per hour accelerates to pass a truck. When the car reaches a speed of 90 kilometers per hour the driver hears the glove compartment door start to vibrate. By the time the speed of the car is 100 kilometers per hour, the glove compartment door has stopped vibrating. This vibrating phenomenon is an example of",
"correctAnswerText": "resonance",
"incorrectText1": "the Doppler effect",
"incorrectText2": "diffraction",
"incorrectText3": "destructive interference"
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"questionText": "A student sees a train that is moving away from her and sounding its whistle at a constant frequency. Compared to the sound produced by the whistle, the sound observed by the student is",
"correctAnswerText": "lower in pitch",
"incorrectText1": "greater in amplitude",
"incorrectText2": "a transverse wave rather than a longitudinal wave",
"incorrectText3": "higher in pitch"
}, {
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"questionText": "Light demonstrates the characteristics of",
"correctAnswerText": "both particles and waves",
"incorrectText1": "particles, only",
"incorrectText2": "waves, only",
"incorrectText3": "neither particles nor waves"
}, {
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"questionText": "The slope of a graph of photon energy versus photon frequency represents",
"correctAnswerText": "Planck’s constant",
"incorrectText1": "the mass of a photon",
"incorrectText2": "the speed of light",
"incorrectText3": "the speed of light squared"
}, {
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"questionText": "Which is a vector quantity?",
"correctAnswerText": "electric field strength",
"incorrectText1": "electric charge",
"incorrectText2": "electric potential difference",
"incorrectText3": "electric resistance"
}, {
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"questionText": "What is the speed of a 2.5-kilogram mass after it has fallen freely from rest through a distance of 12 meters?",
"correctAnswerText": "15 m/s",
"incorrectText1": "4.8 m/s",
"incorrectText2": "30. m/s",
"incorrectText3": "43 m/s"
}, {
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"questionText": "A machine launches a tennis ball at an angle of 25° above the horizontal at a speed of 14 meters per second. The ball returns to level ground. Which combination of changes must produce an increase in time of flight of a second launch?",
"correctAnswerText": "increase the launch angle and increase the ball’s initial speed",
"incorrectText1": "decrease the launch angle and decrease the ball’s initial speed",
"incorrectText2": "decrease the launch angle and increase the ball’s initial speed",
"incorrectText3": "increase the launch angle and decrease the ball’s initial speed"
}, {
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"questionText": "A plane flying horizontally above Earth’s surface at 100. meters per second drops a crate. The crate strikes the ground 30.0 seconds later. What is the magnitude of the horizontal component of the crate’s velocity just before it strikes the ground? [Neglect friction.]",
"correctAnswerText": "100. m/s",
"incorrectText1": "0 m/s",
"incorrectText2": "294 m/s",
"incorrectText3": "394 m/s"
}, {
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"questionText": "A woman with horizontal velocity v1 jumps off a dock into a stationary boat. After landing in the boat, the woman and the boat move with velocity v2. Compared to velocity v1, velocity v2 has",
"correctAnswerText": "smaller magnitude and the same direction",
"incorrectText1": "the same magnitude and the same direction",
"incorrectText2": "the same magnitude and opposite direction",
"incorrectText3": "larger magnitude and the same direction"
}, {
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"questionText": "Which object has the greatest inertia?",
"correctAnswerText": "a 20.-kg object at rest",
"incorrectText1": "a 5.0-kg object moving at a speed of 5.0 m/s",
"incorrectText2": "a 10.-kg object moving at a speed of 3.0 m/s",
"incorrectText3": "a 15-kg object moving at a speed of 1.0 m/s"
}, {
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"questionText": "As an astronaut travels from the surface of Earth to a position that is four times as far away from the center of Earth, the astronaut’s",
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"incorrectText1": "mass decreases",
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"incorrectText3": "weight remains the same"
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"questionText": "A spring with a spring constant of 80. newtons per meter is displaced 0.30 meter from its equilibrium position. The potential energy stored in the spring is",
"correctAnswerText": "3.6 J",
"incorrectText1": "7.2 J",
"incorrectText2": "12 J",
"incorrectText3": "24 J"
}, {
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"questionText": "The work done in accelerating an object along a frictionless horizontal surface is equal to the change in the object’s",
"correctAnswerText": "kinetic energy",
"incorrectText1": "momentum",
"incorrectText2": "velocity",
"incorrectText3": "potential energy"
}, {
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"questionText": "As a block slides across a table, its speed decreases while its temperature increases. Which two changes occur in the block’s energy as it slides?",
"correctAnswerText": "a decrease in kinetic energy and an increase in internal energy",
"incorrectText1": "an increase in kinetic energy and a decrease in internal energy",
"incorrectText2": "a decrease in both kinetic energy and internal energy",
"incorrectText3": "an increase in both kinetic energy and internal energy"
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"questionText": "If 60. joules of work is required to move 5.0 coulombs of charge between two points in an electric field, what is the potential difference between these points?",
"correctAnswerText": "12 V",
"incorrectText1": "5.0 V",
"incorrectText2": "60. V",
"incorrectText3": "300 V"
}, {
"itemType": "HLVQOFZNT76ZJ2G",
"questionText": "Which statement best describes a proton that is being accelerated?",
"correctAnswerText": "It produces electromagnetic radiation.",
"incorrectText1": "The magnitude of its charge increases.",
"incorrectText2": "It absorbs a neutron to become an electron.",
"incorrectText3": "It is attracted to other protons."
}, {
"itemType": "BPTWCYPYPX7LKM7",
"questionText": "If the distance separating an electron and a proton is halved, the magnitude of the electrostatic force between these charged particles will be",
"correctAnswerText": "quadrupled",
"incorrectText1": "unchanged",
"incorrectText2": "doubled",
"incorrectText3": "quartered"
}, {
"itemType": "EXOGVT56OSTPSHJ",
"questionText": "If the amplitude of a wave traveling in a rope is doubled, the speed of the wave in the rope will",
"correctAnswerText": "decrease",
"incorrectText1": "increase",
"incorrectText2": "remain the same",
"incorrectText3": ""
}, {
"itemType": "H3M6B02R96UG3FY",
"questionText": "A ringing bell is located in a chamber. When the air is removed from the chamber, why can the bell be seen vibrating but not be heard?",
"correctAnswerText": "Light waves can travel through a vacuum, but sound waves cannot.",
"incorrectText1": "Sound waves have greater amplitude than light waves.",
"incorrectText2": "Light waves travel slower than sound waves.",
"incorrectText3": "Sound waves have higher frequency than light waves."
}, {
"itemType": "CEXN6PH66YIGZ9P",
"questionText": "As a transverse wave travels through a medium, the individual particles of the medium move",
"correctAnswerText": "perpendicular to the direction of wave travel",
"incorrectText1": "parallel to the direction of wave travel",
"incorrectText2": "in circles",
"incorrectText3": "in ellipses"
}, {
"itemType": "FYMRXTNIT92NO3G",
"questionText": "What happens to the speed and frequency of a light ray when it passes from air into water?",
"correctAnswerText": "The speed decreases and the frequency remains the same.",
"incorrectText1": "The speed decreases and the frequency increases.",
"incorrectText2": "The speed increases and the frequency increases.",
"incorrectText3": "The speed increases and the frequency remains the same."
}, {
"itemType": "0ZQCO5086JV6D2T",
"questionText": "Parallel wave fronts incident on an opening in a barrier are diffracted. For which combination of wavelength and size of opening will diffraction effects be greatest?",
"correctAnswerText": "long wavelength and narrow opening",
"incorrectText1": "short wavelength and narrow opening",
"incorrectText2": "short wavelength and wide opening",
"incorrectText3": "long wavelength and wide opening"
}, {
"itemType": "BPB92HRSAF1C42M",
"questionText": "Which wave phenomenon occurs when vibrations in one object cause vibrations in a second object?",
"correctAnswerText": "resonance",
"incorrectText1": "reflection",
"incorrectText2": "intensity",
"incorrectText3": "tuning"
}, {
"itemType": "HHPQAMH7DC6EPY9",
"questionText": "A photon having an energy of 9.40 electronvolts strikes a hydrogen atom in the ground state. Why is the photon not absorbed by the hydrogen atom?",
"correctAnswerText": "The photon’s energy is too small.",
"incorrectText1": "The atom’s orbital electron is moving too fast.",
"incorrectText2": "The photon striking the atom is moving too fast.",
"incorrectText3": "The photon is being repelled by electrostatic force."
}, {
"itemType": "Y6ZRS4SKZL68BXB",
"questionText": "What fundamental force holds quarks together to form particles such as protons and neutrons?",
"correctAnswerText": "strong force",
"incorrectText1": "electromagnetic force",
"incorrectText2": "gravitational force",
"incorrectText3": "weak force"
}, {
"itemType": "KKD3SKLBVTGFS6Y",
"questionText": "What is the magnitude of the force needed to keep a 60.-newton rubber block moving across level, dry asphalt in a straight line at a constant speed of 2.0 meters per second?",
"correctAnswerText": "40. N",
"incorrectText1": "51 N",
"incorrectText2": "60. N",
"incorrectText3": "120 N"
}, {
"itemType": "8PI4WKJV8PCMVVV",
"questionText": "What is the current measured by ammeter A?",
"correctAnswerText": "2.0 A",
"incorrectText1": "0.50 A",
"incorrectText2": "72 A",
"incorrectText3": "4.0 A"
}, {
"itemType": "V04KA3SO339ZRC0",
"questionText": "How much power is dissipated in the 36-ohm resistor?",
"correctAnswerText": "4.0 W",
"incorrectText1": "110 W",
"incorrectText2": "48 W",
"incorrectText3": "3.0 W"
}, {
"itemType": "UUJV4DBV47BP4O3",
"questionText": "A 1.00-kilogram ball is dropped from the top of a building. Just before striking the ground, the ball’s speed is 12.0 meters per second. What was the ball’s gravitational potential energy, relative to the ground, at the instant it was dropped? [Neglect friction.]",
"correctAnswerText": "72.0 J",
"incorrectText1": "6.00 J",
"incorrectText2": "24.0 J",
"incorrectText3": "144 J"
}, {
"itemType": "GFXWS6SN49151J3",
"questionText": "A 110-kilogram bodybuilder and his 55-kilogram friend run up identical flights of stairs. The bodybuilder reaches the top in 4.0 seconds while his friend takes 2.0 seconds. Compared to the power developed by the bodybuilder while running up the stairs, the power developed by his friend is",
"correctAnswerText": "the same",
"incorrectText1": "twice as much",
"incorrectText2": "half as much",
"incorrectText3": "four times as much"
}, {
"itemType": "PP23100KZM74VPE",
"questionText": "Which wavelength is in the infrared range of the electromagnetic spectrum?",
"correctAnswerText": "100 μm",
"incorrectText1": "100 nm",
"incorrectText2": "100 mm",
"incorrectText3": "100 m"
}, {
"itemType": "ZD5ZA4PTOJLOMUZ",
"questionText": "What is the total number of quarks in a helium nucleus consisting of 2 protons and 2 neutrons?",
"correctAnswerText": "12",
"incorrectText1": "16",
"incorrectText2": "8",
"incorrectText3": "4"
}, {
"itemType": "JCYXI63DJ16TQE0",
"questionText": "A rock falls from rest off a high cliff. How far has the rock fallen when its speed is 39.2 meters per second? [Neglect friction.]",
"correctAnswerText": "78.3 m",
"incorrectText1": "19.6 m",
"incorrectText2": "44.1 m",
"incorrectText3": "123 m"
}, {
"itemType": "VP0PAKNO4TMFZSX",
"questionText": "A golf ball is propelled with an initial velocity of 60. meters per second at 37° above the horizontal. The horizontal component of the golf ball’s initial velocity is",
"correctAnswerText": "48 m/s",
"incorrectText1": "30. m/s",
"incorrectText2": "36 m/s",
"incorrectText3": "40. m/s"
}, {
"itemType": "55ZNEVK6I9ZWO6D",
"questionText": "Which object has the greatest inertia?",
"correctAnswerText": "a 15-kilogram object at rest",
"incorrectText1": "a 1.0-kilogram object moving at 15 meters per second",
"incorrectText2": "a 5.0-kilogram object at rest",
"incorrectText3": "a 10.-kilogram object moving at 2.0 meters per second"
}, {
"itemType": "DS2FJ7ZHHS9MRC3",
"questionText": "A 3-newton force and a 4-newton force are acting concurrently on a point. Which force could not produce equilibrium with these two forces?",
"correctAnswerText": "9 N",
"incorrectText1": "1 N",
"incorrectText2": "7 N",
"incorrectText3": "4 N"
}, {
"itemType": "FHZABM4FBTDKYNT",
"questionText": "A positively charged glass rod attracts object X. The net charge of object X",
"correctAnswerText": "may be zero or negative",
"incorrectText1": "may be zero or positive",
"incorrectText2": "must be negative",
"incorrectText3": "must be positive"
}, {
"itemType": "DXSCDNW2RD05PQI",
"questionText": "A 2.0-kilogram block sliding down a ramp from a height of 3.0 meters above the ground reaches the ground with a kinetic energy of 50. joules. The total work done by friction on the block as it slides down the ramp is approximately",
"correctAnswerText": "9 J",
"incorrectText1": "6 J",
"incorrectText2": "18 J",
"incorrectText3": "44 J"
}, {
"itemType": "VCARCL5DRVYOE9P",
"questionText": "The potential energy stored in a compressed spring is to the change in the spring’s length as the kinetic energy of a moving body is to the body’s",
"correctAnswerText": "speed",
"incorrectText1": "mass",
"incorrectText2": "radius",
"incorrectText3": "acceleration"
}, {
"itemType": "DR9SERCNMCVABGV",
"questionText": "Radio waves are propagated through the interaction of",
"correctAnswerText": "electric and magnetic fields",
"incorrectText1": "nuclear and electric fields",
"incorrectText2": "gravitational and magnetic fields",
"incorrectText3": "gravitational and electric fields"
}, {
"itemType": "99K0OLTLQOOO4I5",
"questionText": "A 6.0-ohm resistor that obeys Ohm’s Law is connected to a source of variable potential difference. When the applied voltage is decreased from 12 V to 6.0 V, the current passing through the resistor",
"correctAnswerText": "is halved",
"incorrectText1": "remains the same",
"incorrectText2": "is doubled",
"incorrectText3": "is quadrupled"
}, {
"itemType": "0RR21EAVKBMQ72Z",
"questionText": "A 50-watt lightbulb and a 100-watt lighbulb are each operated at 110 volts. Compared to the resistance of the 50-watt bulb, the resistance of the 100-watt bulb is",
"correctAnswerText": "half as great",
"incorrectText1": "twice as great",
"incorrectText2": "one-fourth as great",
"incorrectText3": "four times as great"
}, {
"itemType": "SXOXMHV5JKF18LC",
"questionText": "A device operating at a potential difference of 1.5 volts draws a current of 0.20 ampere. How much energy is used by the device in 60. seconds?",
"correctAnswerText": "18 J",
"incorrectText1": "4.5 J",
"incorrectText2": "8.0 J",
"incorrectText3": "12 J"
}, {
"itemType": "NAN2WYSD5M3LXBN",
"questionText": "As the number of resistors in a parallel circuit is increased, what happens to the equivalent resistance of the circuit and total current in the circuit?",
"correctAnswerText": "Equivalent resistance decreases and total current increases.",
"incorrectText1": "Both equivalent resistance and total current decrease.",
"incorrectText2": "Both equivalent resistance and total current increase.",
"incorrectText3": "Equivalent resistance increases and total current decreases."
}, {
"itemType": "85NON9BAU2AR6HF",
"questionText": "The energy of a sound wave is most closely related to its",
"correctAnswerText": "amplitude",
"incorrectText1": "period",
"incorrectText2": "frequency",
"incorrectText3": "wavelength"
}, {
"itemType": "BFGLSQMF5APDDL5",
"questionText": "A girl on a swing may increase the amplitude of the swing’s oscillations if she moves her legs at the natural frequency of the swing. This is an example of",
"correctAnswerText": "the Doppler effect",
"incorrectText1": "destructive interference",
"incorrectText2": "wave transmission",
"incorrectText3": "resonance"
}, {
"itemType": "Z2I7G984RII3Q5K",
"questionText": "An earthquake wave is traveling from west to east through rock. If the particles of the rock are vibrating in a north-south direction, the wave must be classified as",
"correctAnswerText": "transverse",
"incorrectText1": "longitudinal",
"incorrectText2": "a microwave",
"incorrectText3": "a radio wave"
}, {
"itemType": "5K0CGYDSFF2B5FD",
"questionText": "A 2.0-kilogram object is falling freely near Earth’s surface. What is the magnitude of the gravitational force that Earth exerts on the object?",
"correctAnswerText": "20. N",
"incorrectText1": "2.0 N",
"incorrectText2": "0.20 N",
"incorrectText3": "0.0 N"
}, {
"itemType": "0S2GJW7975DU7LS",
"questionText": "A force of 6.0 newtons changes the momentum of a moving object by 3.0 kilogram•meters per second. How long did the force act on the mass?",
"correctAnswerText": "0.50 s",
"incorrectText1": "1.0 s",
"incorrectText2": "2.0 s",
"incorrectText3": "0.25 s"
}, {
"itemType": "ORSHYBY66EMSW55",
"questionText": "Which two quantities can be expressed using the same units?",
"correctAnswerText": "impulse and momentum",
"incorrectText1": "energy and force",
"incorrectText2": "impulse and force",
"incorrectText3": "momentum and energy"
}, {
"itemType": "I3ELSRC87JU9905",
"questionText": "A 512-hertz sound wave travels 100. meters to an observer through air at STP. What is the wavelength of this sound wave?",
"correctAnswerText": "0.646 m",
"incorrectText1": "0.195 m",
"incorrectText2": "1.55 m",
"incorrectText3": "5.12 m"
}, {
"itemType": "024S2SOHE5RGJYO",
"questionText": "Compared to the speed of microwaves in a vacuum, the speed of x rays in a vacuum is",
"correctAnswerText": "the same",
"incorrectText1": "less",
"incorrectText2": "greater",
"incorrectText3": ""
}, {
"itemType": "BU1NCY32KRLWLOH",
"questionText": "Which type of photon is emitted when an electron in a hydrogen atom drops from the n = 2 to the n = 1 energy level?",
"correctAnswerText": "ultraviolet",
"incorrectText1": "visible light",
"incorrectText2": "infrared",
"incorrectText3": "radio wave"
}, {
"itemType": "XZ3WKOZ2AH5S4PT",
"questionText": "A lithium atom consists of 3 protons, 4 neutrons, and 3 electrons. This atom contains a total of",
"correctAnswerText": "21 quarks and 3 leptons",
"incorrectText1": "9 quarks and 7 leptons",
"incorrectText2": "12 quarks and 6 leptons",
"incorrectText3": "14 quarks and 3 leptons"
}, {
"itemType": "OYOPO4YUABEOV5J",
"questionText": "A 1.0-kilogram ball is dropped from the roof of a building 40. meters tall. What is the approximate time of fall? [Neglect air resistance.]",
"correctAnswerText": "2.9 s",
"incorrectText1": "2.0 s",
"incorrectText2": "4.1 s",
"incorrectText3": "8.2 s"
}, {
"itemType": "74SLBYX5EFRFQV7",
"questionText": "Which is a scalar quantity?",
"correctAnswerText": "speed",
"incorrectText1": "acceleration",
"incorrectText2": "momentum",
"incorrectText3": "displacement"
}, {
"itemType": "XV0ZT4FHIAGUK60",
"questionText": "A 2.0-kilogram laboratory cart is sliding across a horizontal frictionless surface at a constant velocity of 4.0 meters per second east. What will be the cart’s velocity after a 6.0-newton westward force acts on it for 2.0 seconds?",
"correctAnswerText": "2.0 m/s west",
"incorrectText1": "2.0 m/s east",
"incorrectText2": "10. m/s east",
"incorrectText3": "10. m/s west"
}, {
"itemType": "5BDNYTIIR6PRI5O",
"questionText": "A 25.0-kilogram space probe fell freely with an acceleration of 2.00 meters per second2 just before it landed on a distant planet. What is the weight of the space probe on that planet?",
"correctAnswerText": "50.0 N",
"incorrectText1": "12.5 N",
"incorrectText2": "25.0 N",
"incorrectText3": "250. N"
}, {
"itemType": "0P1AURZ9I1I79FY",
"questionText": "When the index card is quickly pulled away from the glass in a horizontal direction, the disk falls straight down into the glass. This action is a result of the disk’s",
"correctAnswerText": "inertia",
"incorrectText1": "charge",
"incorrectText2": "shape",
"incorrectText3": "temperature"
}, {
"itemType": "7URL948HFH3GPTC",
"questionText": "A vertical spring 0.100 meter long is elongated to a length of 0.119 meter when a 1.00-kilogram mass is attached to the bottom of the spring. The spring constant of this spring is",
"correctAnswerText": "520 N/m",
"incorrectText1": "9.8 N/m",
"incorrectText2": "82 N/m",
"incorrectText3": "98 N/m"
}, {
"itemType": "413L0WXGYD7P5LU",
"questionText": "Compared to the force needed to start sliding a crate across a rough level floor, the force needed to keep it sliding once it is moving is",
"correctAnswerText": "less",
"incorrectText1": "greater",
"incorrectText2": "the same",
"incorrectText3": ""
}, {
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"questionText": "A 400-newton girl standing on a dock exerts a force of 100 newtons on a 10 000-newton sailboat as she pushes it away from the dock. How much force does the sailboat exert on the girl?",
"correctAnswerText": "100 N",
"incorrectText1": "25 N",
"incorrectText2": "400 N",
"incorrectText3": "10 000 N"
}, {
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"questionText": "A 6.8-kilogram block is sliding down a horizontal, frictionless surface at a constant speed of 6.0 meters per second. The kinetic energy of the block is approximately",
"correctAnswerText": "120 J",
"incorrectText1": "20. J",
"incorrectText2": "41 J",
"incorrectText3": "240 J"
}, {
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"questionText": "Through what vertical distance is a 50.-newton object moved if 250 joules of work is done against the gravitational field of Earth?",
"correctAnswerText": "5.0 m",
"incorrectText1": "2.5 m",
"incorrectText2": "9.8 m",
"incorrectText3": "25 m"
}, {
"itemType": "LOU0U6SR6KSI51D",
"questionText": "When a mass is placed on a spring with a spring constant of 15 newtons per meter, the spring is compressed 0.25 meter. How much elastic potential energy is stored in the spring?",
"correctAnswerText": "0.47 J",
"incorrectText1": "0.94 J",
"incorrectText2": "1.9 J",
"incorrectText3": "3.8 J"
}, {
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"questionText": "Two students of equal weight go from the first floor to the second floor. The first student uses an elevator and the second student walks up a flight of stairs. Compared to the gravitational potential energy gained by the first student, the gravitational potential energy gained by the second student is",
"correctAnswerText": "the same",
"incorrectText1": "less",
"incorrectText2": "greater",
"incorrectText3": ""
}, {
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"questionText": "A 55.0-kilogram diver falls freely from a diving platform that is 3.00 meters above the surface of the water in a pool. When she is 1.00 meter above the water, what are her gravitational potential energy and kinetic energy with respect to the water’s surface?",
"correctAnswerText": "PE = 540 J and KE = 1080 J",
"incorrectText1": "PE = 1620 J and KE = 0 J",
"incorrectText2": "PE = 1080 J and KE = 540 J",
"incorrectText3": "PE = 810 J and KE = 810 J"
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"questionText": "A 0.25-kilogram baseball is thrown upward with a speed of 30. meters per second. Neglecting friction, the maximum height reached by the baseball is approximately",
"correctAnswerText": "46 m",
"incorrectText1": "15 m",
"incorrectText2": "74 m",
"incorrectText3": "92 m"
}, {
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"questionText": "In a series circuit containing two lamps, the battery supplies a potential difference of 1.5 volts. If the current in the circuit is 0.10 ampere, at what rate does the circuit use energy?",
"correctAnswerText": "0.15 W",
"incorrectText1": "0.015 W",
"incorrectText2": "1.5 W",
"incorrectText3": "15 W"
}, {
"itemType": "",
"questionText": "How are electromagnetic waves that are produced by oscillating charges and sound waves that are produced by oscillating tuning forks similar?",
"correctAnswerText": "Both have the same frequency as their respective sources.",
"incorrectText1": "Both require a matter medium for propagation.",
"incorrectText2": "Both are longitudinal waves.",
"incorrectText3": "Both are transverse waves."
}, {
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"questionText": "When observed from Earth, the wavelengths of light emitted by a star are shifted toward the red end of the electromagnetic spectrum. This redshift occurs because the star is",
"correctAnswerText": "moving away from Earth",
"incorrectText1": "at rest relative to Earth",
"incorrectText2": "moving toward Earth at decreasing speed",
"incorrectText3": "moving toward Earth at increasing speed"
}, {
"itemType": "",
"questionText": "All photons in a vacuum have the same",
"correctAnswerText": "speed",
"incorrectText1": "wavelength",
"incorrectText2": "energy",
"incorrectText3": "frequency"
}, {
"itemType": "",
"questionText": "Which phenomenon best supports the theory that matter has a wave nature?",
"correctAnswerText": "electron diffraction",
"incorrectText1": "electron momentum",
"incorrectText2": "photon momentum",
"incorrectText3": "photon diffraction"
}, {
"itemType": "",
"questionText": "Which pair of quantities can be expressed using the same units?",
"correctAnswerText": "work and kinetic energy",
"incorrectText1": "power and momentum",
"incorrectText2": "impulse and potential energy",
"incorrectText3": "acceleration and weight"
}, {
"itemType": "",
"questionText": "An electrical generator in a science classroom makes a lightbulb glow when a student turns a hand crank on the generator. During its operation, this generator converts",
"correctAnswerText": "mechanical energy to electrical energy",
"incorrectText1": "chemical energy to electrical energy",
"incorrectText2": "electrical energy to mechanical energy",
"incorrectText3": "electrical energy to chemical energy"
}, {
"itemType": "",
"questionText": "Which changes would cause the greatest increase in the rate of flow of charge through a conducting wire?",
"correctAnswerText": "increasing the applied potential difference and decreasing the length of wire",
"incorrectText1": "increasing the applied potential difference and increasing the length of wire",
"incorrectText2": "decreasing the applied potential difference and decreasing the length of wire",
"incorrectText3": "decreasing the applied potential difference and increasing the length of wire"
}, {
"itemType": "",
"questionText": "According to the Standard Model of Particle Physics, a meson is composed of",
"correctAnswerText": "a quark and an antiquark",
"incorrectText1": "a quark and a muon neutrino",
"incorrectText2": "three quarks",
"incorrectText3": "a lepton and an antilepton"
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"questionText": "How much total energy is dissipated in 10. seconds in a 4.0-ohm resistor with a current of 0.50 ampere?",
"correctAnswerText": "10. J",
"incorrectText1": "2.5 J",
"incorrectText2": "5.0 J",
"incorrectText3": "20. J"
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"questionText": "A circuit has a current of 5.0 amperes  owing through it. How long does it take for 30 coulombs of charge to be transferred past a given point in the circuit?",
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"incorrectText1": "5.0 sec",
"incorrectText2": "3.0 sec",
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"incorrectText1": "mechanical energy to electrical energy",
"incorrectText2": "heat energy to electrical energy",
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"incorrectText3": "4 mho"
},
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"questionText": "Eight coulombs of electric charge  ow through a wire in two seconds. What is the current?",
"correctAnswerText": "4 amperes",
"incorrectText1": "2 amperes",
"incorrectText2": "8 amperes",
"incorrectText3": "10 amperes"
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"incorrectText2": "one-fourth as much",
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"incorrectText2": "1,500 joules",
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"incorrectText2": "100 joules",
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"incorrectText3": "volume"
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"questionText": "Which of the following is a physical change?",
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"incorrectText2": "rust forming on an iron fence",
"incorrectText3": "a copper roof changing color from red to green"
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"questionText": "Flammability is a material’s ability to burn in the presence of",
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"incorrectText2": "hydrogen.",
"incorrectText3": "nitrogen."
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"incorrectText3": "has a high boiling point."
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"questionText": "Which of the following is NOT a clue that a chemical change has occurred?",
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"questionText": "Who provided evidence for the existence of a nucleus in an atom?",
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"questionText": "What can you assume has happened if an electron moves to a higher energy level?",
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"incorrectText3": "The electron has gained energy."
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"questionText": "How was Bohr’s atomic model similar to Rutherford’s model?",
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"incorrectText2": "It described electron position in terms of the electron cloud model.",
"incorrectText3": "It described how electrons gain or lose energy."
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"questionText": "What does the electron cloud model describe?",
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"incorrectText3": "number of protons."
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"questionText": "At room temperature, none of the metals are",
"correctAnswerText": "gases.",
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"incorrectText2": "liquids.",
"incorrectText3": "malleable."
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"questionText": "Atoms of the most reactive elements tend to have",
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"questionText": "When 100 identical steel balls are placed on a triple beam balance, their mass is determined to be 1,450 grams. The mass of a single steel ball would be closest to",
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"incorrectText2": "90",
"incorrectText3": "180"
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"questionText": "A person travels 6 meters north, 4 meters east, and 6 meters south. What is the total displacement?",
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"incorrectText2": "16m east",
"incorrectText3": "6m south"
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"questionText": "A student walks 3 blocks south, 4 blocks west, and 3 blocks north. What is the displacement of the student?",
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"incorrectText1": "10 blocks west",
"incorrectText2": "10 blocks east",
"incorrectText3": "4blocks east"
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"questionText": "A force of 6.0 newtons north and a force of 8.0 newtons east act concurrently on an object. The magnitude of the resultant of the two forces is",
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"incorrectText1": "14N",
"incorrectText2": "2N",
"incorrectText3": "1.3N"
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"questionText": "A student walks 1.0 kilometer due east and 1.0 kilometer due south. Then she runs 2.0 kilometers due west. The magnitude of the student's resultant displacement is closest to",
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"incorrectText1": "0 km",
"incorrectText2": "4.0 km",
"incorrectText3": "3.4 km"
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"questionText": "Two concurrent forces have a maximum resultant of 45 newtons and a minimum resultant of 5.0 newtons. What is the magnitude of each of these forces?",
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"incorrectText2": "5.0N and 9.0N",
"incorrectText3": "0.0N and 50N"
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