A String Is Wrapped Around a Pulley with a Radius

question 39

Multiple Choice

A string is wrapped around a pulley with a radius of 2.0 cm and no appreciable friction in its axle.The pulley is initially not turning.A constant force of 50 N is applied to the string,which does not slip,causing the pulley to rotate and the string to unwind.If the string unwinds 1.2 m in ,what is the moment of inertia of the pulley?

• A) 0.17 kg • m²
• B) 17 kg • m²
• C) 14 kg • m²
• D) 0.20 kg • m²
• E) 0.017 kg • m²