[填空题]
Pilots can be tested for the stres 4z4xx jsd8nt x8-n0nysaczr dbm2 q-.7es of flying highspeed jets in a whirling “human ce-2rc7ba qz dm.ntrifuge,” 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? $rpm$