. a 4.45-kg centrifuge takes 2 minutes to spin up from rest to its final angular speed with constant angular acceleration. a point located 8.00 cm from the axis of rotation of the centrifuge moves with a speed of 150 m/s when the centrifuge is at full speed. (a) what is the angular acceleration (in rad/s2) of the centrifuge as it spins up? (b) how many revolutions does the centrifuge make as it goes from rest to its final angular speed?