Question

An 8.0-cm radius disk with a rotational inertia of 0.12 kgm2is free to rotate on a horizontal axis. A string is fastened to the surface of the disk and a 10-kg mass hangs from the other end. The mass is raised by using a crank to apply a 9.0-N.m torque to the disk. The acceleration of the mass is:
A) 0.50 m/s2
B) 3.9 m/s2
C) 6.0 m/s2
D) 12 m/s2
E) 20 m/s2

Answer

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