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A disk, with a radius of 0.25 m, is to be rotated like a merry-go-round through 1000 rad, starting from rest, gaining angular speed at the constant rate ?1 through the first 500 rad and then losing angular speed at the constant rate -?1 until it is again at rest. The magnitude of the centripetal acceleration of any portion of the disk is not to exceed 100 m/s2. (a) What is the least time required for the rotation? (b) What is the corresponding value of ?1?

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