[填空题]
Pilots can be tested for the stress:7nr+ej dfggv jw-y65 es of flying highspeed jets in a whirl-1m82w2 9p adzzi zrbling “human centrifuge,” which takes 1.0 min to t92iz8dlbz1ap-rmw 2 z urn 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? $rpm$