[填空题]
Pilots can be tested for the s6y/vj n6u8acpu7 -hut tresses of flying hi5 ad wxa, knafrtfh6)ad6s9- (ghspeed jets in a whirling “human centrifuge,” which takes x6fkda6-)atwfadha5, (r s9 n 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? $rpm$