[填空题]
A centrifuge rotor rotatij9sy4tyt 7 pjg 2s90r8p0zkwlnw(/s bb zzrv68i2fo+y g at 10,300 rpm is shut off and is eventually brought uniformly to rest by a frictional torqw ( bsbvo28f iz+yrz/6ue 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