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Starting from rest, a fan accelerates with constant angular acceleration. At one time it is rotating...

Starting from rest, a fan accelerates with constant angular acceleration. At one time it is rotating at 10 rev/s; 20 revolutions later, its angular speed is 150 rev/s.

(a) The angular acceleration.

(b) The time required by the fan to complete the 20 revelations.

(c) The number of revolutions from rest until the fan reaches the 10 rev/s angular speed.

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