226_Physics ProblemsTechnical Physics

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

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228 Potential Energy P8.25 (a) Fi j =+ 300 500 . ± . ± ej N m W = =− = 400 200 3 00 2 00 5 00 3 00 9 00 . . ± . ± .. . . . kg m J ri j af a f The result does not depend on the path since the force is conservative. (b) WK =∆ −= F H G I K J 900 2 2 2 2 . . . . v a f so v = = 32 0 9 00 339 . . m s (c) UW = J Section 8.4 Changes in Mechanical Energy for Nonconservative Forces P8.26 (a) UK KU fifi =− + U f =−+= 30 0 18 0 10 0 22 0 ... . J E = 40 0 J (b) Yes, ∆∆ EK U mech is not equal to zero. For conservative forces += 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 EF r FR = cos0 . We shall assign the gravitational energy of the ball-Earth system to be zero with the ball at the
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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