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Four 25 kg children are sitting on the edge of a 3 m radius 80kg merry go round that is shaped like a disk. Its frequency is 1/3 Hz. If three of the four children move to a new direction of 0.5m from the center, what is the new frequency of the disk? If this action took 20 seconds, what was the instantaneous angular acceleration this time? How many rotations did it make during this time? What is the moment of inertia before and after?

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