[填空题]
Pilots can be tested for the stresses of flying highspee-)nslch x 8.azfv0*2ctv 58hi4z kbdnd jets in a whirling rtsx,78sj c1e“human centrifuge,” which takes 1.0 min to turn through 20 complete revolutions before reachij,ss xc7rte1 8ng its final speed. (a) What was its angular acceleration (assumed constant), $rev/min^2$ (b) what was its final angular speed in rpm? $rpm$