A wheel 25.0 cm in radius turning at 120 rpm uniformly increases its frequency to 660 rpm

Question:

A wheel 25.0 cm in radius turning at 120 rpm uniformly increases its frequency to 660 rpm in 9.00 s. Find 

(a) The constant angular acceleration in rad/s2, and 

(b) The tangential acceleration of a point on its rim.

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