An 80-Cm Radius Disk with a Rotational Inertia of 0

Multiple Choice

An 8.0-cm radius disk with a rotational inertia of 0.12 kg.m² is 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