[填空题]
Pilots can be tested for the stresses of flyin1g ozyo/fpmmn7,v+nf 16 (or ug highspeed jetk 7 8fuwrj om3q q:t s8o5jlei)xfj5:.s in a whirling “human centrifuge,” which takes k7l5wje58 mf:.q8f:jq3io)xuts rjo 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? $rpm$