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..m maf.Thus,UA2kgm smJ==×1000980264259 105bgej....The change in potential energy as the car moves from A to B isUUBAJ J−=−×=−×0 2 59 102 59 1055.(b)With our choice of the zero level when the car is at point A, we have
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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 .