[填空题]
A centrifuge rotor rotatitcda+: / rzl/jng 7w99b/ uu yc+ka 6lfwrat 10,300 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 1.9 ukywb caw+f/7l69u r2 $m \cdot N$ If the mass of the rotor is 4.80 kg and it can be approximated as a solid cylinder of radius 0.0710 m, through how many revolutions will the rotor turn before coming to rest, $rev$ how long will it take? s