[填空题]
Suppose a star the ssmf+x)e2z rxeeo 02t1 ize of our Sun, but with mass 8.0 times a zj46an fws:e;sm 4(/)zhhjjws great, were rotating at a speed of 1.0 revolution every 12 days. If it were to undergo gravitational collapse to a neutron star of radius 11jm; w6jsn/az zseh) 4:j4hfw ( km, losing three-quarters of its mass in the process, what would its rotation speed be? Assume that the star is a uniform sphere at all times, and that the lost mass carries off no angular momentum. $\times10^{9 }$ $rev/day$