[填空题]
Pilots can be tested for the stresses of flying highspeed jets i(6iuy9 .y5d3navjq 1( rlt zdfn a0lbg pky+ sc 8c-3l(y,nlvq0e whirling “human centrifuge,” which takes 1.0 min to turn through 20 complete revolutions before reaching its final speednle ly0q,3 +0bvpsyl8gcc k-(. (a) What was its angular acceleration (assumed constant), $rev/min^2$ (b) what was its final angular speed in rpm? $rpm$