[填空题]
Pilots can be tested for the stwf 5d(oekfqewg1 4q z9 q /m+2rb(hfu4resses of flying highspeed s4u5d h s7fxv1jets in a whirling “hum5us7xd 4vfsh1 an centrifuge,” 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? $rpm$