[填空题]
Pilots can be tested for the stresses of flrr r6bby .34w5tjp -ztying highspeed jets in a whirlin0jmz*)r q v.i, 9fo o kwz1jlx8x*,umng “human centrifuge,” which takes 1.0 min to turn through 20 complete revolutions before reaching it *)q uznoi0 wk,jm1,m.v9zjlox8 frx*s final speed. (a) What was its angular acceleration (assumed constant), $rev/min^2$ (b) what was its final angular speed in rpm? $rpm$