[填空题]
Pilots can be tested for the stres 8ly75rc/d)2moui palses tc2kthhr)f+nj 1za75n a6,pb8ugpg. of flying highspeed jets in a whirling “human cengpaz1ht u8h bpn6ja ,frc.5k+7)2 tgntrifuge,” which 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? $rpm$