Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Specific impulse wikipedia , lookup
Hunting oscillation wikipedia , lookup
Internal energy wikipedia , lookup
Eigenstate thermalization hypothesis wikipedia , lookup
Classical central-force problem wikipedia , lookup
Work (thermodynamics) wikipedia , lookup
Theoretical and experimental justification for the Schrödinger equation wikipedia , lookup
Physics: Momentum, Work, Energy, Power Name: 1. 2. The momentum of a 5-kilogram object moving at 6 meters per second is A. 1 kg C. 11 kg 4. 5. 6. m/sec B. m/sec 5 kg 7. m/sec D. 30 kg m/sec A 60-kilogram student running at 3.0 meters per second has a kinetic energy of A. 3. Date: 180 J B. 270 J C. 540 J 8. D. 8100 J A cart of mass m traveling at speed v has kinetic energy KE. If the mass of the cart is doubled and its speed is halved, the kinetic energy of the cart will be A. half as great B. C. one-fourth as great D. four times as great 9. twice as great Which of the following objects has the greatest momentum? 10. As the unbalanced force applied to an object increases, the time rate of change of the object's momentum A. decreases C. remains the same B. increases A cart weighing 10 newtons is pushed 10 meters on a level surface by a force of 5 newtons. What is the increase in its potential energy? A. 1 joule B. 50 joules C. 100 joules D. 0 joules An unbalanced 6.0-newton force acts eastward on an object for 3.0 seconds. The impulse produced by the force is A. 18 N s east B. 2.0 N s east C. 18 N s west D. 2.0 N s west What is the magnitude of the velocity of a 25-kilogram mass that is moving with a momentum of 100 kilogram-meters per second? A. a 1-kg object moving at 200 m/sec B. a 10-kg object moving at 30 m/sec C. a 20-kg object moving at 20 m/sec A. 0.25 m/s B. D. a 100-kg object moving at 2 m/sec C. 40 m/s D. 4.0 m/s One joule is equivalent to one A. newton meter3 C. watt2 newton 11. B. kilogram meter3 D. kilogram meter2 second2 As a 1.0-kilogram mass falls freely to the Earth, its momentum A. decreases C. remains the same B. increases page 1 2500 m/s A 25-kilogram mass travels east with a constant velocity of 40 meters per second. The momentum of this mass is A. 1:0 103 kg m=s east B. 9:8 103 kg m=s east C. 1:0 103 kg m=s west D. 9:8 103 kg m=s west 12. 13. A 0.025-kilogram bullet is red from a ri e by an unbalanced force of 200 newtons. If the force acts on the bullet for 0.1 second, what is the maximum speed attained by the bullet? A. 5 m/s B. C. 400 m/s D. 800 m/s 17. A. 20 m/s A pendulum swings as shown in the diagram. At which position is the kinetic energy of the pendulum bob least? A. A B. C. C D. D Each of the blocks in the diagrams is lifted vertically for the distance indicated. Which block will gain the most gravitational potential energy? B. B C. 14. 15. 16. A constant braking force of 10 newtons applied for 5 seconds is used to stop a 2.5-kilogram cart traveling at 20 meters per second. The magnitude of the impulse applied to stop the cart is A. 10 N s B. 30 N C. 50 N s D. 100 N D. s s Two rocks weighing 5 newtons and 10 newtons, respectively, fall freely from rest near the Earth's surface. After 3 seconds of free-fall, compared to the 5-newton rock, the 10-newton rock has greater A. acceleration B. C. momentum D. speed 18. height In a baseball game, a batter hits a ball for a home run. Compared to the magnitude of the impulse imparted to the ball, the magnitude of the impulse imparted to the bat is A. less B. greater C. A student drops two eggs of equal mass simultaneously from the same height. Egg A lands on the tile oor and breaks. Egg B lands intact without bouncing, on a foam pad lying on the oor. Compared to the magnitude of the impulse on egg A as it lands, the magnitude of the impulse on egg B as it lands is A. 19. the same B. greater C. the same An object 10 meters above the ground has Z joules of potential energy. If the object falls freely, how many joules of kinetic energy will it have gained when it is 5 meters above the ground? A. page 2 less Z B. 2Z C. Z 2 D. 0 Physics: Momentum, Work, Energy, Power 20. A 0.60-kilogram softball initially at rest is hit with a bat. The ball is in contact with the bat for 0.20 second and leaves the bat with a speed of 25 meters per second. What is the magnitude of the average force exerted by the ball on the bat? A. 21. 8.3 N B. 15 N C. 3.0 N 24. D. 75 N If the speed of a moving object is doubled, which quantity associated with the object must also double? A. its momentum B. its kinetic energy C. its acceleration What is the magnitude of the impulse applied to the 30.-kilogram rollerskater? D. its gravitational potential energy 22. 23. In the diagram below, a 60.-kilogram rollerskater exerts a 10.-newton force on a 30.-kilogram rollerskater for 0.20 second. The magnitude of the momentum of an object is 64.0 kilogram meters per second. If the velocity of the object is doubled, the magnitude of the momentum of the object will be 25. A. 50. N s B. 2.0 N s C. 6.0 N s D. 12 N s Which two quantities can be expressed using the same units? A. 32.0 kg m/s B. 64.0 kg m/s A. energy and force C. 128 kg m/s D. 256 kg m/s B. impulse and force C. momentum and energy Which is an acceptable unit for impulse? A. N m B. C. J s D. kg m/s D. impulse and momentum J/s 26. Four machines do the amounts of work listed in the table shown. The time they take to do the work is also listed. Which machine develops the most power? Machine A B C D A. page 3 A Work Time 1,000 joules 10 sec 2,000 joules 10 sec 1,000 joules 2,000 joules B. B 5 sec 5 sec C. C D. D Physics: Momentum, Work, Energy, Power 27. 28. 29. 30. 31. How much work is required to lift a 2-kilogram mass to a height of 10 meters? A. 5 joules B. C. 100 joules D. 200 joules 32. 20 joules A garden tractor drags a plow with a force of 500 newtons a distance of 10 meters in 20 seconds. How much work is done? A. 25 joules B. C. 2,500 joules D. 5,000 joules 33. 1,000 joules As the length of time it takes a student to swim 100 meters decreases, the power developed by the student A. decreases C. remains the same B. 34. increases How much work will a 500-watt motor do in 10 seconds? A. 0.02 joule B. C. 500 joules D. 5,000 joules 35. 50 joules What force is required to do 60 joules of work in sliding an object a distance of 10 meters across a level oor? A. 6 newtons B. 10 newtons C. 60 newtons D. 600 newtons Car A and car B are of equal mass and travel up a hill. Car A moves up the hill at a constant speed that is twice the constant speed of car B. Compared to the power developed by car B, the power developed by car A is A. the same B. twice as much C. half as much D. four times as much What is the maximum distance that a 60-watt motor may vertically lift a 90-newton weight in 7.5 seconds? A. 2.3 m B. 5.0 m C. 140 m D. 1100 m The graph shows the force exerted on a block as a function of the block's displacement in the direction of the force. How much work did the force do in displacing the block 5.0 meters? The diagram here shows a 1-kilogram aluminum sphere and a 3-kilogram copper sphere of equal radius located 20 meters above the ground. A. 36. Just before striking the ground, the speed of the copper sphere is 20 meters per second. What is the momentum of the copper sphere? A. 10 kg-m/sec B. 20 kg-m/sec C. 60 kg-m/sec D. 600 kg-m/sec page 4 0J B. 20 J C. 0.80 J D. 4.0 J If a net force of 10 newtons acts on a 6.0-kilogram mass for 8.0 seconds, the total change of momentum of the mass is A. 48 kg m/s B. 60 kg C. 80 kg m/s D. 480 kg m/s m/s Physics: Momentum, Work, Energy, Power 37. 38. 40. The diagram shows a 1:0 103 -newton crate to be lifted at constant speed from the ground to a loading dock 1.5 meters high in 5.0 seconds. What power is required to lift the crate? A. 1:5 103 W B. 2:0 102 W C. 3:0 102 W D. 7:5 103 W A force is applied to a block, causing it to accelerate along a horizontal, frictionless surface. The energy gained by the block is equal to the A. work done on the block B. power applied to the block C. impulse applied to the block D. momentum given to the block 41. A box is pushed to the right with a varying horizontal force. The graph below represents the relationship between the applied force and the distance the box moves. A 75-kilogram boy initially at rest skis down the slope as shown. Assuming no frictional loss, what will be his kinetic energy at the bottom of the slope? Force vs.Distance 42. What is the total work done in moving the box 6.0 meters? A. 39. 9.0 J B. 18 J C. 27 J D. 36 J 43. A 100-kilogram person acquires a velocity of 15 meters per second down a ski slope. What is the skier's kinetic energy? A. 22,500 joules B. 11,250 joules C. 1,500 joules D. 115 joules A. 1,500 joules B. 7,500 joules C. 15,000 joules D. 75,000 joules As a falling apple approaches the ground, its potential energy A. decreases C. remains the same B. increases The work done in raising an object must result in an increase in the object's A. internal energy B. kinetic energy C. gravitational potential energy D. heat energy page 5 Physics: Momentum, Work, Energy, Power 44. As the pendulum swings from position A to position B as shown in the diagram, what is the relationship of kinetic energy to potential energy? [Neglect friction.] 48. Work is being done when a force A. acts vertically on a cart that can only move horizontally B. is exerted by one team in a tug of war when there is no movement C. is exerted while pulling a wagon up a hill D. of gravitational attraction acts on a person standing on the surface of the Earth A. The kinetic energy decrease is more than the potential energy increase. B. The kinetic energy increase is more than the potential energy decrease. C. The kinetic energy decrease is equal to the potential energy increase. 49. D. The kinetic energy increase is equal to the potential energy decrease. 45. 46. A. 5,000 sec B. C. 10 sec D. 0.2 sec 50 sec A. January B. March C. July D. September Three people of equal mass climb a mountain using paths A, B, and C shown in the diagram. Along which path(s) does a person gain the greatest amount of gravitational potential energy from start to nish? A basketball player who weighs 600 newtons jumps 0.5 meter vertically o the oor. What is her kinetic energy just before hitting the oor? A. 47. 50. How long would it take a machine to do 5,000 joules of work if the power rating of the machine is 100 watts? The Earth is closest to the Sun during January and farthest from the Sun during July. During which month is the gravitational potential energy of the Earth with respect to the Sun the greatest? 30 J B. 60 J C. 300 J D. 600 J A. A, only If the speed of an object is doubled, its kinetic energy will be B. B, only C. C, only A. halved B. D. The gain is the same along all paths. C. quartered D. quadrupled doubled page 6 Physics: Momentum, Work, Energy, Power Problem-Attic format version 4.4.236 c 2011–2015 EducAide Software _ Licensed for use by Wilson McConkie Terms of Use at www.problem-attic.com Physics: Momentum, Work, Energy, Power 01/27/2016 1. Answer: D 21. Answer: A 2. Answer: B 22. Answer: C 3. Answer: A 23. Answer: D 4. Answer: C 24. Answer: B 5. Answer: D 25. Answer: D 6. Answer: B 26. Answer: C 7. Answer: B 27. Answer: D 8. Answer: D 28. Answer: D 9. Answer: A 29. Answer: B 10. Answer: D 30. Answer: D 11. Answer: A 31. Answer: C 12. Answer: D 32. Answer: A 13. Answer: D 33. Answer: B 14. Answer: C 34. Answer: B 15. Answer: C 35. Answer: B 16. Answer: C 36. Answer: C 17. Answer: B 37. Answer: C 18. Answer: C 38. Answer: C 19. Answer: C 39. Answer: B 20. Answer: D 40. Answer: A Teacher's Key 41. Answer: C 42. Answer: A 43. Answer: C 44. Answer: D 45. Answer: B 46. Answer: C 47. Answer: D 48. Answer: C 49. Answer: C 50. Answer: D Page 2