ch08-p047 - 47. (a) We take the initial gravitational...

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47. (a) We take the initial gravitational potential energy to be U i = 0. Then the final gravitational potential energy is U f = – mgL , where L is the length of the tree. The change is UU m g L fi −= = = −× (( . 25 12 2 9 10 3 kg) 9.8 m s m) J . 2 di (b) The kinetic energy is 22 2 11 (25 kg)(5.6 m/s) 3.9 10 J Km v == = × . (c) The changes in the mechanical and thermal energies must sum to zero. The change in
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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