[填空题]
Pilots can be tested for the stressp*;v9b67zo x ypgw2kjes of flying highspeed jets in a whlu 7su9i(/le j 254chi)mkjm cirling “human centrifuge,” which takes 1.0 min to turn through 20 complete r5/u 9()4l sc7m mhck2lueji ijevolutions 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? $rpm$