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**Unformatted text preview: **Chapter 6, Momentum and Collisions 71 C HAPTER 6 6.1 Momentum and Impulse 1. A valid unit for momentum is which of the following? a. kg m/s 2 b. kg/m 2 c. kg m/s d. N m 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 divers 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? a. 900 N b. 450 N c. 525 N d. 1 500 N 4. A 0.12-kg ball is moving at 6 m/s when it is hit by a bat, causing it to reverse direction and have a speed of 14 m/s. What is the change in the magnitude of the momentum of the ball? a. 0.39 kg m/s b. 0.42 kg m/s c. 1.3 kg m/s d. 2.4 kg m/s 5. The impulse experienced by a body is equivalent to its change in: a. velocity. b. kinetic energy. c. momentum. d. None of the above choices are valid. Chapter 6, Momentum and Collisions 72 6. The dimensional equivalence of the quantity momentum in terms of the fundamental quantities (mass, length, time) is: a. MLT-1 . b. ML 2 T-2 . c. MLT. d. MLT-2 . 7. Alex throws a 0.15-kg rubber ball down onto the floor. The balls speed just before impact is 6.5 m/s, and just after is 3.5 m/s. What is the change in the magnitude of the balls momentum? a. 0.09 kg m/s b. 1.5 kg m/s c. 4.3 kg m/s d. 126 kg m/s 8. Alex throws a 0.15-kg rubber ball down onto the floor. The balls speed just before impact is 6.5 m/s, and just after is 3.5 m/s. If the ball is in contact with the floor for 0.025 s, what is the magnitude of the average force applied by the floor on the ball? a. 60 N b. 133 N c. 3.0 N d. 3.5 N 9. A crane drops a 0.30 kg steel ball onto a steel plate. The balls speeds just before impact and after are 4.5 m/s and 4.2 m/s, respectively. If the ball is in contact with the plate for 0.030 s, what is the magnitude of the average force that the ball exerts on the plate during impact? a. 87 N b. 133 N c. 3.0 N d. 3.5 N 10. Jerome pitches a baseball of mass 0.20 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Jerome with a return speed of 60 m/s. What is the magnitude of change in the balls momentum? a. 4.0 kg m/s b. 8.0 kg m/s c. 18 kg m/s d. 20 kg m/s Chapter 6, Momentum and Collisions 73 11. Lonnie pitches a baseball of mass 0.20 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Lonnie with a return speed of 60 m/s. If the bat is in contact with the ball for 0.050 s, what is the impulse experienced by the ball? ...

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