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A playground merry-go-round has a disk-shaped platform that rotates with negligible friction about a vertical axis....

A playground merry-go-round has a disk-shaped platform that rotates with negligible friction about a vertical axis. The disk has a mass of 200 kg and a radius of 2.1 m. A 36- kg child rides at the center of the merry-go-round while a playmate sets it turning at 0.50rpm. If the child then walks along a radius to the outer edge of the disk, how fast will the disk be turning? (in rpm - but enter no unit)

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