[填空题]
A centrifuge rotor rotating at 10 4kxztz 5(8xlx0tn4qli1kmtkr6s2 s 7,300 rpm is s zs1)-n3 .ts(hmqsuyg e9+fm,,tc : x iwmcx+qhut off and is eventually brought uniformly to rest by a frictional torque of c 9iysqe n t,:sq1(ut)sg .mxfhxz+mm+w-3c,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