[填空题]
Pilots can be tested fo7 5:tta2qpdh(5d h b:uklbx. er the stresdcpi3+x tnt l 3:gx6-vses of flying highspeed jets in a whirling “human centrifuge,” which takes 1.0 min to turn through 20 complete revolutions before reaching its finaltl6i t-g+xxv :3np3dc speed. (a) What was its angular acceleration (assumed constant), $rev/min^2$ (b) what was its final angular speed in rpm? $rpm$