[填空题]
Pilots can be tested for the stresses of flying highspeed jet8z 5;qu7) ejrezzzuy 2s in a whirloc bybl7r(3nrly4n //ing “human cenn(7/c3 o yl4/bryrblntrifuge,” 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? $rpm$