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Constant angular acceleration, velocity and centripetal acceleration ot point on a wheel

A wheel starts from rest and rotates about its axis with constant angular acceleration. After 6.8 seconds have elapsed, it has rotated through an angle of 25 radians.

A) What is the angular acceleration of the wheel?
B) What is the angular velocity when the time t = 6.8 seconds?
C) What is the centripetal acceleration of a point on the wheel a distance r = 0.45 meters from the axis at t = 6.8 seconds?

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