A thin, massless string is wrapped around a 0.25 m radius grindstone supported by bearings that produce negligible frictional torque. A steady tension of 20 N in the string causes the grindstone to move from rest to a speed of 60 rad/s in 12 s. The moment of inertia of the grindstone is A) 1.0 kg · m². B) 2.0 kg · m². C) 3.0 kg · m². D) 4.0 kg · m². E) 5.0 kg · m².

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The Answer of A thin, massless string is wrapped around a 0.25 m radius grindstone supported by bearings that produce negligible frictional torque. A steady tension of 20 N in the string causes the grindstone to move from rest to a speed of 60 rad/s in 12 s. The moment of inertia of the grindstone is A) 1.0 kg · m². B) 2.0 kg · m². C) 3.0 kg · m². D) 4.0 kg · m². E) 5.0 kg · m².

A Thin, Massless String Is Wrapped Around a 0