Ch06 - Chapter 6, Momentum and Collisions CHAPTER 6 3. A...

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Chapter 6, Momentum and Collisions C HAPTER 6 3. A 75-kg swimmer dives horizontally off a 500-kg raft. If the diver’s speed immediately after leaving the raft is 4 m/s, what is the corresponding raft speed? a. 0.2 m/s b. 0.5 m/s c. 0.6 m/s d. 4.0 m/s 4. 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? a. 900 N b. 450 N c. 525 N d. 1 500 N 5. During a snowball fight two balls with masses of 0.4 and 0.6 kg, respectively, are thrown in such a manner that they meet head-on and combine to form a single mass. The magnitude of initial velocity for each is 15 m/s. What is the speed of the 1.0-kg mass immediately after collision? a. zero b. 3 m/s c. 6 m/s d. 9 m/s 61

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Chapter 6, Momentum and Collisions 6. A 2 500-kg truck moving at 10.00 m/s strikes a car waiting at a traffic light, hooking bumpers. The two continue to move together at 7.00 m/s. What was the mass of the struck car? a. 1 730 kg b. 1 550 kg c. 1 200 kg d. 1 070 kg 7. 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 of 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 8. A cannon of mass 1 500 kg fires a 10-kg shell with a velocity of 200 m/s at an angle of 45 ° above the horizontal. Find the recoil velocity of the cannon across the level ground. a. 1.33 m/s b. 0.94 m/s c. 2.41 m/s d. 1.94 m/s 9. A billiard ball collides in an elastic head-on collision with a second stationary identical ball. After the collision which of the following conditions applies to the first ball? a. maintains the same velocity as before b. has one half its initial velocity c. comes to rest d. moves in the opposite direction 10. A billiard ball collides in an elastic head-on collision with a second identical ball. What is the kinetic energy of the system after the collision compared to that before collision? a. the same as b. one fourth c. twice d. four times 11. In a two-body collision, if the momentum of the system is conserved, then which of the following best describes the kinetic energy after the collision? a. must be less b. must also be conserved c. may also be conserved d. is doubled in value 62
Chapter 6, Momentum and Collisions 12. In a two-body collision, if the kinetic energy of the system is conserved, then which of the following best describes the momentum after the collision?

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This note was uploaded on 07/25/2008 for the course PHY 231C taught by Professor Pratt during the Spring '06 term at Michigan State University.

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Ch06 - Chapter 6, Momentum and Collisions CHAPTER 6 3. A...

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