A Thin, Massless String Is Wrapped Around a 0

question 25

Multiple Choice

A thin, massless string is wrapped around a 0.25m 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 12s. 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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