[填空题]
Pilots can be tested for the stresses of flyp:9rka)hd y* oing highspeed jet65li b rz1ads3 z(fa: -ye3ggks in a whirling “human centrifuge,” which takes 1.0 min to turn lr 6k35zz:y-f ai3gbags(1 dethrough 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? $rpm$