[填空题]
Pilots can be tested *nshy:ygi znm t,*9;sfor the stresses of flying highspeed jets in a whircuf b(qo3n -l(ling “human centrifuge,” which takes 1.0 min to turn thron(( bu-l3q fcough 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? $rpm$