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Acceleration processes EssayWhen the bus stops suddenly, the book slides forward off the seat. In the reference frame of the ground, which of the succeeding(a) is correct? a) b) c) d) e) A net force acted on it. No net force acted on it. It remained at rest. It did not move, simply only seemed to. Gravity in brusque stopped acting on it. 7. Consider a cart on a horizontal frictionless table. Once the cart has been given a beseech in the x-direction and released, what will happen to the cart? a) b) c) d) e) It slowly comes to a stop. It continues with constant acceleration. It continues with decreasing acceleration.It continues with constant velocity. It immediately comes to a stop. 8. Off to the Races F v From rest, we measure on the gas of our Ferrari, providing a force F for 4s, speeding it up to a final speed v. If the applied force were only 1/2 F, how long would it have to be applied to reach the same final speed? a) 16s b) 8s c) 4s d) 2s e) 1s 9. Two blocks of the same spile are connected by a string and are pulled across a frictionless surface by a constant force. Will the two blocks move with constant velocity? a) Yes, two blocks move with constant velocity. b) No, both blocks move with constant acceleration. ) The two blocks will have different velocities and/or accelerations. 10. Referring to figure in Q9, will the tension in the connecting string be greater than, less than, or equal to the force F ? a) Greater than. b) Less than. c) Equal to. 11. Force and Two Masses F m1 a1 a2 = 2a1 F m2 F m2 m1 a3 A force F acts on mass m1 giving acceleration a1. The same force acts on a different mass m2 giving acceleration a2 = 2a1. If m1 and m2 are glued together and the same force F acts on this combination, what is the resulting acceleration? a) 3/4 a1 b) 3/2 a1 c) 1/2 a1 d) 4/3 a1 e) 2/3 a1 12.Bowling vs. Ping-Pong I F12 F21 In outer space, a bowling ball and a table tennis ball attract each other due to gravitative forces. How do the magnitudes o f these attractive forces compare? a) b) c) d) e) The bowling ball exerts a greater force on the ping-pong ball. The ping-pong ball exerts a greater force on the bowling ball. The forces are equal in magnitude. The forces are zero because they cancel out. on that point are actually no forces at all. 13. Bowling vs. Ping-Pong II In outer space, gravitational forces exerted by a bowling ball and a ping-pong ball on each other are equal and opposite.How do their accelerations compare? a) b) c) d) e) They do not accelerate because they are weightless. Accelerations are equal, but not opposite. Accelerations are opposite, but bigger for the bowling ball. Accelerations are opposite, but bigger for the ping-pong ball. Accelerations are equal and opposite. 14. A ball tied to a string is being whirled around in a circle. What can you say about the work done by tension? T v a) accent does no work at all. b) Tension does negative work. c) Tension does positive work. 15. You lift a book with y our hand in such a fashion that it moves up at constant speed.While it is moving, what is the total work done on the book? ?r FHAND v = const a=0 mg a) b) c) d) e) mg ? ?r FHAND ? ?r (FHAND + mg) ? ?r Zero None of the higher up. 16. Two paths lead to the top of a big hill. One is steep and direct, while the other is twice as long but less steep. How much more potential energy would you gain if you take the longer path? a) b) c) d) e) The same as the short path. Twice as much. Four quantifys as much. Half as much. No PE gained in either case. 17.A hole is drilled through the effect of Earth and emerges on the other side. You jump into the hole. What will happen to you? Hint Inside earth, when you are at a distance r away from the center, the gravitational force on you is just the force due to your body mass and the earth mass of sphere of radius r from the center. ) a) b) c) d) You fall to the center and stop. You go all the way through and continue off into space. You fall to t he other side of Earth and then return. You wont fall at all. 18. A proton and an electron are held apart a distance of 1 m and then released. As they approach each other, what will happen to the force mingled with them? a) It gets bigger. b) It gets smaller. c) It stays the same. 19.Continuing from Q18, which particle has the larger acceleration at any time? a) Proton. b) Electron. c) Both the same. 20. Continuing from Q19, where would they meet? a) In the middle. b) Closer to the electrons side. c) Closer to the protons side. 21. Considering a vibrating pendulum as shown in the figure. i) At which of the above time is the kinetic energy a maximum? ii) At which of the above time is the potential energy a maximum? iii) At which of the above time is kinetic energy being transformed to potential energy? iv) At which of the above time is potential energy being transformed to kinetic energy?