[填空题]
Pilots can be tested for the stresses oa etbzjc, r.as*0+ am0f flying highspeed jets in a whirling2tzx n6(ur+cy v:ba j1x *bis3 “human centrifuge,” which takes 1.0 min to turn through 20 complete revolutions bef3b t*i1b(c:sxuv +jnaxyzr6 2 ore reaching its final speed. (a) What was its angular acceleration (assumed constant), $rev/min^2$ (b) what was its final angular speed in rpm? $rpm$