[填空题]
Pilots can be tested for the stresses + a / x;yfu:shba/ 3 mom5nhi.mma8)izx uy xi. +mudfruovz0x2bz(m d/7)/h4of flying highspeed jets in a whirling “human centrifuge,0(/4mdb ) x uixrdofy.u+h 7xvu/ z2zm” 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? $rpm$