[填空题]
A centrifuge rotor ri7oqafc 59)0z,u,om7n nm iqjotating at 10,30p6v/g g8 s; opdlskf1h8+v ai50 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 1.+8v f1ggo5pks; hv86sap dl/ i2 $m \cdot N$ 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