A wheel of 40-cm radius rotates on a stationary central axle. It is uniformly sped up from

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A wheel of 40-cm radius rotates on a stationary central axle. It is uniformly sped up from rest to 900 rpm in a time of 20 s. Find 

(a) The constant angular acceleration of the wheel and 

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

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