qz6sp08sol - February29,2008 PHY2053Discussion...

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February 29, 2008 PHY2053 Discussion Quiz 6 (Chapter 6.1 -6.3) Name:                                   UFID: *1. (5 pts) A 0.50 kg ball is dropped from rest from a height of 40.0 m above the ground.  It rebounds from the ground and reaches the maximum height of 20.0 m. What impulse  is given to the ball by the ground? Taking the positive x direction upward, the velocity the ball just before and just after it   hits the ground are given by mgh = 1/2mv²   v = -√(2gh) = -28.0 m/s  mgh’ = 1/2mv’²   v = +√(2gh’) = 19.8 m/s Using the impulse momentum theorem we get I = Δp = m(v’-v) = 0.5(19.8-(-28)) = 23.9 Ns ***2. (5 pts) A 60.0 kg skater is moving at 3.00 m/s toward a 30.0 kg skater at rest.  They are on a frictionless frozen lake. The 60 kg skater throws a 0.500 kg ball forward  with a ground speed of 20.0 m/s and the 30 kg skater catches the ball. Assuming they 
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This note was uploaded on 12/13/2011 for the course PHY 2053 taught by Professor Buchler during the Fall '06 term at University of Florida.

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qz6sp08sol - February29,2008 PHY2053Discussion...

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