A 90-kg person stands at the edge of a stationary childrens merrygo- round (essentially a disk) at

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A 90-kg person stands at the edge of a stationary children’s merrygo- round (essentially a disk) at a distance of 5.0 m from its center. The person starts to walk around the perimeter of the disk at a speed of 0.80 m/s relative to the ground. What rotation rate does this motion impart to the disk if Idisk = 20 000 kg · m2?

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