[填空题]
A centrifuge rotor rotating at 10,300 rpm is shuh f2w7qntgr 7 5igzn3.t off and is eventually brougk esdrfmxi)xr1yq./l:w4(* oht uniformly to rest by a frictiom.xrx )f*14o /ei kl(sr:qydw nal 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