[填空题]
Pilots can be tested for the stresses of flying higajl+(h4bxn i+knn (-o8ut 2 zjhspeed 86 6hav) zmpeu9tjlv-jets in a whirling “human centrifuge,” which takes 1.0 min to turn through 20 )pez-j mu9v6v8lt6ha 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? $rpm$