[填空题]
Pilots can be tested for the stresses of flying highspeed jets in a a,0rnuolq -38k alv)o jqn.l, whirl/sod wdf: s875k+2xd5uibi mz ing “human centrifuge,” which takes 1.0 min t/kiz58s:odb7 dudwm 5 x2s+ ifo 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? $rpm$