[填空题]
Suppose a star the size oki-dpd-i6w- hg ;zj, of our Sun, a*f.fx3v* (*2j0foba deltiu but with mass 8.0 times as great, were rotating at a speed of 1.0 revolution every 12 days. If it were to undergo gravitational colla3adl0 *x*.j2a vubff *f(teiopse to a neutron star of radius 11 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. $\times10^{9 }$ $rev/day$