Two children each of mass 20 kg ride on the perimeter of a, Ask an Expert

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Two children, each of mass 20 kg, ride on the perimeter of a small merry-go-round that is rotating at the rate of 0.25 rev/s. The merry-go-round is a solid disk of mass 30 kg and radius 3 m. The children now both move halfway in toward the center to positions 1.5 m from the axis of rotation. Calculate the final rate of rotation.

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