[填空题]
Pilots can be tested for the stresses of flying highspeed jets in 4i x17 yetst, tx*k7 ,d-xpmzma whirling “h5 zxqo.b hwf:6oht2u ,uman centrifuge,” which takes 1.0 min to turn through 20 comp,of:qw.xuz t6h 2hb5olete 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? $rpm$