[填空题]
A centrifuge rotor r)/ u+,;zyqa :wcbruuatvja 57otating at 10,3.lsj * 4b-d8rk5dsd ao00 rpm is shut off and is eventually brought uniformly told k -ojba4d5*.s8ds r 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