[填空题]
Pilots can be tested for the stresses of 1aa dna2z: f0h,v-pidflying highspeed jetsl9c7ud 7n((6elejur3o) qngw in a whirling “human centrifuge,” which takes 1. l( clu 93g7r ewq(nj7e)dnu6o0 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? $rpm$