248 Potential Energy*P8.73(a)At the top of the loop the car and riders are in freefall:Fmayy∑=:mgmvRdowndown=2vRg=Energy of the car-riders-Earth system is conservedbetween release and top of loop:KU K Uigifgf+=+:01222+mghmvmgRafghRggRhR=+=122250af.(b)Let hnow represent the height ≥25.Rof the releasepoint. At the bottom of the loop we havemghmvb=122orvghb22=a∑=:nmgmvRbb−=2upbggmghRb2At the top of the loop,
This is the end of the preview. Sign up
access the rest of the document.