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226_Physics ProblemsTechnical Physics

# 226_Physics ProblemsTechnical Physics - 228 P8.25 Potential...

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228 Potential Energy P8.25 (a) F i j = + 3 00 5 00 . ± . ± e j N m W = = = + = 4 00 2 00 3 00 3 00 2 00 5 00 3 00 9 00 . . ± . ± . . . . . kg m J r i j e j a f a f The result does not depend on the path since the force is conservative. (b) W K = ∆ = F H G I K J 9 00 4 00 2 4 00 4 00 2 2 2 . . . . v a f so v = = 32 0 9 00 2 00 3 39 . . . . m s (c) U W = − = 9 00 . J Section 8.4 Changes in Mechanical Energy for Nonconservative Forces P8.26 (a) U K K U f i f i = + U f = + = 30 0 18 0 10 0 22 0 . . . . J E = 40 0 . J (b) Yes, E K U mech = + is not equal to zero. For conservative forces K U + = 0. P8.27 The distance traveled by the ball from the top of the arc to the bottom is π R . The work done by the non-conservative force, the force exerted by the pitcher, is E F r F R = °= cos0 π a f . We shall assign the gravitational energy of the ball-Earth system to be zero with the ball at the
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