Posted by **Meghan** on Sunday, December 5, 2010 at 7:42pm.

A disk, with a radius of 0.25 m, is to be rotated like a merry-go-round through 800 rad, starting from rest, gaining angular speed at the constant rate α1 through the first 400 rad 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 400 m/s2. (a) What is the least time required for the rotation? (b) What is the corresponding value of α1?

- physics -
**Anonymous**, Wednesday, March 11, 2015 at 12:47pm
210651.035102351

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