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# TB_chapter6 - Chapter 6 Momentum and Collisions CHAPTER 6...

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Chapter 6, Momentum and Collisions C HAPTER 6 Conceptual Problems C1. Two masses collide and stick together. Before the collision one of the masses was at rest. Is there a situation in which the kinetic energy is conserved in such a collision? a. Yes, if the less massive particle is the one initially at rest. b. Yes, if the more massive particle is the one initially at rest. c. Yes, if the two particles have the same mass. d. No, kinetic energy is always lost is such a collision. C2. In an automobile collision, how does an airbag lessen the blow to the passenger? Assume as a result of the collision, the passenger stops. a. The air bag decreases the momentum change of the passenger in the collision. b. During the collision, the force from the air bag is greater than would be the force from the windshield or dashboard so the passenger cannot hit the hard objects. c. The stopping impulse is the same for either the hard objects or the airbag. Unlike the windshield or dashboard, the air bag gives some increasing the time for the slowing process and thus decreasing the average force on the passenger. d. The airbag is there to insure the seatbelt holds. C3. Two masses m 1 and m 2 , with m 1 = 3 m 2 , undergo a head-on elastic collision. If the particles were approaching with speed v before the collision, with what speed are they moving apart after collision? C4. Two masses m 1 and m 2 , with m 1 < m 2 , have momenta with equal magnitudes. How do their kinetic energies compare? a. KE 1 < KE 2 b. KE 1 = KE 2 c. KE 1 > KE 2 d. More information is needed. C5. Two particles collide, one of them initially being at rest. Is it possible for both particles to be at rest after the collision? 76

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Chapter 6, Momentum and Collisions 6.1 Momentum and Impulse 1. A valid unit for momentum is which of the following? 2. The dimensional equivalent of the quantity impulse in terms of the fundamental quantities (mass, length, time) is which of the following? a. MLT - 1 b. ML 2 T - 2 c. MLT d. MLT - 2 3. A 75-kg swimmer dives horizontally off a 500-kg raft. The diver’s speed immediately after leaving the raft is 4.0 m/s. A micro-sensor system attached to the edge of the raft measures the time interval during which the diver applies an impulse to the raft just prior to leaving the raft surface. If the time interval is read as 0.20 s, what is the magnitude of the average horizontal force by diver on the raft?
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TB_chapter6 - Chapter 6 Momentum and Collisions CHAPTER 6...

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