A disk, with a radius of 0.25m, is to be rotated like a merry-go-round through 800rad, starting from rest, gaining angular speed at the constant rate α1 through the first 400rad and then losing angular speed at the constant rate −α1 until it is again at rest. The magnitude of the centripetal acceleration of any portion of the disk is not to exceed 400m/s^2. (a) What is the least time required for the rotation?

A disk, with a radius of 0.25m, is to be rotated like a merry-go-round

1.	A disk, with a radius of 0.25m, is to be rotated like a merry-go-round through 800rad, starting from rest, gaining angular speed at the constant rate α1 through the first 400rad and then losing angular speed at the constant rate −α1 until it is again at rest. The magnitude of the centripetal acceleration of any portion of the disk is not to exceed 400m/s^2. (a) What is the least time required for the rotation?
Answer» it's too MUCH LONGER. I can not ANSWER it.sorryExplanation:

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