Quiz 4

# Quiz 4 - Physics 1A(a Fall 2010 Quiz 4 Version A 1 Closed...

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Physics 1A (a) Fall 2010: Quiz 4 Version A 1 11.19.2010 Closed book. No work needs to be shown for multiple-choice questions. 1 . Patrick 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 Patrick with a return speed of 60 m/s. If the bat is in contact with the ball for 0.10 s, what is the magnitude of the impulse experienced by the ball? a. 4.0 kg(m/s). b. 12 kg(m/s). c. 40 kg(m/s). d. 20 kg(m/s). e. 200 kg(m/s). 2 . 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 e. 12 m/s 3 . A 20-kg object sitting at rest is struck elastically in a head-on collision with a 10-kg object initially moving at +3.0 m/s. Find the final velocity of the 20-kg object after the collision.

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Quiz 4 - Physics 1A(a Fall 2010 Quiz 4 Version A 1 Closed...

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