10.72 CPA thin-walled, hollow spherical shell of mass m and radius rstarts from rest and rolls without slipping down a track (Fig. P10.72).Points A and B are on a circular part of the track having radius R. Thediameter of the shell is very small compared to ho and R, and the workdone by rolling friction is negligible. (a) What is the minimum height hofor which this shell will make a complete loop-the-loop on the circularpart of the track? (b) How hard does the track push on the shell at pointB, which is at the same level as the center of the circle? (c) Supposethat the track had no friction and the shell was released from the sameheight ho you found in part (a). Would it make a complete loop-the-loop? How do you know? (d) In part (c), how hard does the track pushon the shell at point A, the top of the circle? How hard did it push on theshell in part (a)?Figure P10.72Shellho

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