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
This is the end of the preview. Sign up
access the rest of the document.