[填空题]
Pilots can be testedc/uj. uo2;7rg a-dy.f wsy gl3 for the stresses of4 dxxw6ry8 u0o flying highspeed jets in a whirling “human centrifuge,4 uxwx6r0 8doy” 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? $rpm$