[填空题]
A centrifuge rotor rotating at 10,300 rpm is shu(d-dq ry* )m*ofoyxh vkoh6 . 4wh,t8st off and is ev2gka 2wm lh(i4wc6:d* vx7wmw entually brought uniformly to rest by a frictional torquwxl *cdg:m2hawv6 k (7wi 4mw2e 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