# mechanics

A string is wound around a uniform disk of radius R and mass M. The disk is released from
rest when the string is vertical and its top end is tied to a fixed bar.
(a) Draw a free body diagram indicating all the forces acting on the disk.
(b) Calculate the acceleration of the center of mass of the disk.
(c) Calculate the tension in the string.
(d) Calculate the speed of the center of mass as the disk descends a distance h. (Do not use energy
conservation)
(e) Use energy conservation to verify your result in part (d)
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