[填空题]
Pilots can be tested f6mtm vpa9). nvmj4 oo 1grnrp,+v *-xhgu::d ;x.8ccq:fe cq zv -(devor the stresses of flying highspeed jets in a whirling “human centv x ue :.c:qf(c-dc :ge8;dzqvrifuge,” which takes 1.0 min to turn through 20 complete revolutions before reaching its final speed. (a) What was its angular acceleration (assumed constant), $rev/min^2$ (b) what was its final angular speed in rpm? $rpm$