[填空题]
Pilots can be tested for the stresses c16o c:9va ntfjs9f-*+rw mvgof flying highspeed jets in a whirling “hk383tuxwbw 0rjq:vom*qa1 4cuman centrifuge,” which takes 1.0 min to turn through 20 complete revolutions before reachiumbr3j ao0tqwx 3q4wkc*v 81: ng its final speed. (a) What was its angular acceleration (assumed constant), $rev/min^2$ (b) what was its final angular speed in rpm? $rpm$