quiz4a - Physics 1A Winter 2009: Quiz 4 1. An elastic...

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Physics 1A Winter 2009: Quiz 4 Version A 1 02.27.08 Closed book. No work needs to be shown for multiple-choice questions. 1 . An elastic collision is one in which: a. momentum is not conserved but kinetic energy is conserved. b. total mass is not conserved but momentum is conserved. -> c. kinetic energy and momentum are both conserved. d. momentum is conserved but kinetic energy is not conserved. e. the kinetic energy of the system increases after the collision. 2 . A woman weighing 730N stands in the middle of a frozen pond of radius 5m. She is unable to get to the other side because of a lack of friction between her shoes and the ice. To propel herself, she throws a 1.2kg backpack horizontally towards the south shore at a speed of 5m/s. How long does it take her to reach the north shore? a. 30s -> b. 60s c. 90s d. 120s e. 150s 3 . The law of conservation of momentum applies to two colliding objects only if: a. there is no change in kinetic energy of the system. b.
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quiz4a - Physics 1A Winter 2009: Quiz 4 1. An elastic...

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