[填空题]
Pilots can be tested for the stresses of flyinv6n u+ k;buab.mj2;8r.3 mwxisef; kvg highspeed jpemht c878 /yfets in a whirling “human centrifuge,” which takes 1.0 min to turn m fhtp8/yc7e8through 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? $rpm$