Rotational Dynamics: A cinder block of mass m = 4.0 kg is hung from a nylon string that is wrapped around a frictionless pulley having the shape of a cylindrical shell, as shown in the figure. If the cinder block accelerates downward at 4.90 m/s2 when it is released, what is the mass M of the pulley?
A. 2.0 kg
B. 4.0 kg
C. 6.0 kg
D. 8.0 kg
E. 10 kg
Answer: D
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