218 Potential EnergySOLUTIONS TO PROBLEMSSection 8.1Potential Energy of a SystemP8.1(a)With our choice for the zero level for potential energy when the caris at point B,UB=0 .When the car is at point A, the potential energy of the car-Earthsystem is given byUmgyA=FIG. P8.1where yis the vertical height above zero level. With 13541 1ftm=., this height is found as:y=°=41 140 026 4.sin..mmaf.Thus,UA2kgmsmJ==×1 0009 8026 42 59105bgejaf....The change in potential energy as the car moves from A to B isUUBAJJ−=−×=−×02 59102 591055...(b)With our choice of the zero level when the car is at point A, we have
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