A 200-kg merry-go-round in the shape of a uniform solid, Ask an Expert

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A 200-kg merry-go-round in the shape of a uniform, solid, horizontal disk of radius 2.0 m is set in motion by wrapping a rope about the rim of the disk and pulling on the rope. A force of 60 N is exerted on the rope to bring the merry-go-round to rotate from rest. How long is the elapsed time from rest to an angular speed of 1.8 rad/s? The moment of inertia of a solid disk is Πmr².

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