1AbQuiz4

1AbQuiz4 - Physics 1A (b) Fall 2006: Quiz 4 Version D 1...

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Physics 1A (b) Fall 2006: Quiz 4 Version D 1 10.29.06 Closed book. No work needs to be shown for multiple-choice questions. 1 . 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? a. 9.0 N s b. 400 N s c. 360 N s d. 20 N s 2 . A valid unit for impulse is which of the following? a. kg m 2 b. kg m/s c. kg m/s 2 d. N m 3 . A 75-kg swimmer dives horizontally off a 500-kg raft (the raft is initially stationary). 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. 0.6 m/s c. 0.5 m/s d. 4.0 m/s 4 . 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
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1AbQuiz4 - Physics 1A (b) Fall 2006: Quiz 4 Version D 1...

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