[填空题]
Suppose a star the si* o edjw/u;u 3r41arsdioqg5,c7cxapuph;a.n54 c3ap c* ) feze 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-qea.f x,;n a iacc5* po5c u)7p4pq3hcguarters 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. $\times10^{9 }$ $rev/day$