(m = 4.0 kg) the cockroach rides on the rim (at radius R) of a disk (M = 6.0 kg) that turns about its center like a merry-go-round at the rate of 2.0 rad/s. She then crawls from the rim to a point that is 0.50R from the center. At what rate (rad/s) does she and the disk then turn? [Chapter 11, Conservation of angular momentum.]

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