Midterm2Solutionsa

# Midterm2Solutionsa - PHYSICS 9A MIDTERM 2 November 19, 2007...

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PHYSICS 9A MIDTERM 2 November 19, 2007 I certify by my signature below that I will abide by the UC Davis Code of Academic Conduct. This includes not copying from anyone else’s exam not letting any other student copy from my exam not discussing this exam with any student who has not yet taken it, nor providing any information, written or oral, that might get to a student who has not yet taken it. Anyone suspected of cheating will be automatically reported to Student Judicial Affairs. LAST NAME: FIRST NAME: STUDENT ID: (P R I N T) (P R I N T) (LAST 4 DIGITS) Signature: Problem 1. (2 points) In a paintball small and light bullets (with red paint inside) bombard players. Would the average force experienced by you be larger or smaller if the bullets stick to you after the collision or bounce back elastically? A. The force is larger when the bullets stick B. The force is larger when the bullets bounce back C. The force is about the same in both cases Solution: Since the force is proportional to the change in the momentum of the bullets, the change in the

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## Midterm2Solutionsa - PHYSICS 9A MIDTERM 2 November 19, 2007...

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