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A dad pushes tangentially on a small hand-driven merry-go-round and is able to accelerate it from rest to a frequency of 16 rpm in 11.5s . Assume the merry-go-round is a uniform disk of radius 2.5m and has a mass of 800 kg , and two children (each with a mass of 20kg ) sit opposite each other on the edge. What force is required at the edge?

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