[填空题]
A centrifuge rotor rotating at 10,300 rpm is shut off and is eventuo 6wmmwurnstaa 3vu);p*0h6 7ally b-h4zew -9 tcfurought uw 9-hu ft4cze-niformly to rest by a frictional torque of 1.2 $m \cdot N$ 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