[填空题]
A centrifuge rotor rotating at 10,300 rpm is shut of1r ( pv2y7 f-e1zuhz2 5lbuqb3yet+fr f andz6*z/xlry1 x(qf lw *k q-kwk( is eventually brought uniformly to rest by a frictional xk/r6y (l* kfw*1x(zwq k-zl qtorque 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