216_Physics ProblemsTechnical Physics

216_Physics ProblemsTechnical Physics - 218 Potential...

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218 Potential Energy SOLUTIONS TO PROBLEMS Section 8.1 Potential Energy of a System P8.1 (a) With our choice for the zero level for potential energy when the car is at point B, U B = 0 . When the car is at point A, the potential energy of the car-Earth system is given by Um g y A = FIG. P8.1 where y is the vertical height above zero level. With 135 41 1 ft m = . , this height is found as: y = 41 1 40 0 26 4 .s i n . . m m af . Thus, U A 2 kg m s m J == × 1000 980 264 259 10 5 bg ej .. . . The change in potential energy as the car moves from A to B is UU BA J J −= × = −× 0 2 59 10 2 59 10 55 . (b) With our choice of the zero level when the car is at point A, we have
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