[填空题]
Pilots can be testedts )ylf7- bzvf j)hbt,vx: c14 forf9:vj w8vrp(r the stresses of flying highspeed jets in a whirling “human centrifuge,” w:j pv vr9(f8rwhich 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? $rpm$