[填空题]
Suppose a star the sin h -9u6+tpyyhw(ml8o z1 n)kzxa -ti po6pj 0rgsr5*25knb2npe of our Sun, 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 collapse to a neutron star of radius 11 km, losing three-quarters of its mass in the process, what wba 2r1g5s)k p tzo2nxkn*0p n ip-j56rould 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. $\times10^{9 }$ $rev/day$