2. A stone is dropped from the top of a high cliff with zero initial velocity. In which system is the net momentum zero as the stone falls freely? a. the stone and the Earth b. the stone itself C. None of these d. the stone and the person who drops it
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- 34. Imagine that a wood block is sliding along the surface of a desk. Can the frictional forces involved in this interaction change the momentum of the two-body system thought of as the Earth (including the desk) and the block? Yes, because it will provide a negative impulse to the block. Yes, because it will cause a negative impulse to the Earth. No, because the net force on the block will be zero. No, because there is no net external force on the system.A ball is thrown vertically up, reaches a maximum height, and then falls back down to the ground. Which of these is true during the flight of the ball? O a. The momentum of the ball stays constant O b. The speed of the ball changes at a constant rate O c. The momentum of the ball changes at a constant rate O d. The acceleration of the ball changes at a constant rateThe impulse - momentum theorem states that the impulse on an object is equal to:A. The change in its velocityB. The change in its accelerationC. The change in its momentum D. The change in its kinetic energy
- 3. When an apple falls from a tree and strikes the ground without bouncing, what happens to its momentum? a) The momentum of the apple after striking the ground is reversed. b) The speed of the apple is equal and opposite to the speed of the Earth. c) The momentum of the apple while falling is increasingly smaller. d) The momentum of the falling apple is transferred to the Earth.15. Each of the following scenarios involves a system containing 2 objects. In which of the scenarios is the total momentum of the 2 object system constant? (Assume that both the ice rink and the surface of the air track are frictionless) i. A ball bounces elastically off the wall of a building. ii. Two kids shove each other on very slippery ice skating rink A basketball player is standing with her feet stationary on the ground and catches a ball. iii. iv. Two gliders on a horizontal air track collide and stick together during the collision V. Two gliders on a horizontal air track collide and bounce off each other elastically A) i, ii and iv B) ii, iv, v C) i, iii D) i, iii, iv, v E) iv, v8. A machine gun is attached to a railroad flatcar, at rest, that can roll with negligible friction. If the railroad car (including the machine gun) has a mass of 6.25 x 104 kg, how many bullets of mass 25 g would have to be fired at 250 m/s off the back to give the railroad car a forward velocity of 0.5 m/s? A. 1000 bullets B. 2000 bullets C. 3000 bullets D. 4000 bullets E. 5000 bullets
- A 7400 kg truck traveling along a straight road at 14 m/s comes to a stop and remains stationary for several minutes. It then accelerates backward in reverse until it reaches 5.0 m/s in the opposite direction. What is the magnitude of the change in momentum of the truck for this entire process? A. 100,000 kg. m/s B. 140,000 kg. m/s C. 67,000 kgm/s D. 37,000 kgm/s O C O B OD O A7-18. If car A has a greater momentum than car B, what will happen to both vehicles immediately after they collide? A. They will travel to the right. B. They will travel to the left. C. They will stop immediately. D. It cannot be determined from this information. 19. If both cars are travelling the same speed and car B has a greater mass, what will happen to both vehicles after they collide? A. They will travel to the right. B. They will travel to the left. C. They will stop immediately. D. It cannot be determined from this information.