a pottery wheel is rotating initially with an angular velocity of 4.0rad/s clockwise. Sometime later it is rotating with an angular velocity of 9.0 rad/s counterclockwise. At the later time, the wheel is at an angle of 3.0 rad counterclockwise relative to the initial orientation of the wheel. Assuming that the whell undergoes uniform acceleration
a. what is the magnitude of the angular acceleration of the wheel?
b. what is the direction of the angular acceleration of the wheel?