A string is wound around a uniform disk of radius R and mass M. The disk is released from rest with the string vertical and its top end tied to a fixed bar. Using kinematics, calculate: A) the tension in the string as the disk unwinds and falls, B) the acceleration of the center of mass of the disk, C) the speed of the disk after falling a distance H. D) Verify your answer to C) by using the energy method.

A string is wound around a uniform disk of radius R and mass M. The disk is released from rest with the string vertical and its top end tied to a fixed bar. Using kinematics, calculate: A) the tension in the string as the disk unwinds and falls, B) the acceleration of the center of mass of the disk, C) the speed of the disk after falling a distance H. D) Verify your answer to C) by using the energy method.

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