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A playground merry-go-round of radius R = 1.20 m has a moment of inertia I = 265 kg · m2 and is rotating at 12.0 rev/min about a frictionless vertical axle. Facing the axle, a 27.0-kg child hops onto the merry-go-round and manages to sit down on the edge. What is the new angular speed of the merry-go-round?

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