[填空题]
Pilots can be tested for the stresses of f/c 1he35wtap q-)zjlth/l6 hk3,chnelyi9zjlvl,at 5q2ng highspeed jets in a whirling “human centrifugetv 52ljql, z9a,” 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? $rpm$