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A playground merry-go-round in the shape of a solid uniform disk of mass 105 kg and radius R = 2.20 m is rotating at 9.0 rev/min about a
frictionless vertical axle. Facing the axle, a 24.0-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?
O 10.6 rev/min
O 2.55 rev/min
0 5.33 rev/min
0 6.18 rev/min
O 4.50 rev/min

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A playground merry-go-round of radius R = 1.20 m has a moment of inertia I = 255 kg · m2 and is rotating at 9.0 rev/min about a frictionless vertical axle. Facing the axle, a 23.0-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? rev/min Need Help? Read It Watch It