[填空题]
Pilots can be tested .l:sp-0 e8bn0+ xovaojz uge*for,6i x9jjk)vo s the stresses of flying highspeed jets in a whirling “human centrifuge,” which takes 1.0 min t6jo)s ixj9,k vo 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? $rpm$