194_Physics ProblemsTechnical Physics

194_Physics ProblemsTechnical Physics - 196 P7.13 Energy...

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196 Energy and Energy Transfer P7.13 WF d x x = z and W equals the area under the Force-Displacement curve (a) For the region 05 0 0 ≤≤ x . m , W == 300 500 2 750 .. . N m J af (b) For the region 500 100 x , W 3 00 5 00 15 0 . m J (c) For the region 10 0 15 0 x , W 2 . m J a fa f (d) For the region 01 5 0 x . W =+ + = 7 50 7 50 15 0 30 0 . . J J FIG. P7.13 P7.14 Wd x y d x i f =⋅= + zz Fr i j i 43 0 5 ±± ± ej N m 40 4 2 50 0 0 5 2 0 5 ±Nm ± J m m bg xdx x += = z . P7.15 k F y Mg y = × 400 980 250 10 157 10 2 3 . . N m (a) For 1.50 kg mass y mg k × = 150 980 0938 3 . . cm (b) Work = 1 2 2 ky Work × =
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