[填空题]
Suppose a star the size of our Sun, but with mass 8.0 times as gread hor1j60dto0b iq4g8 t, were rowbx g.ne2 x2q5tating 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 would its rotatix5 b22e nqxg.won speed be? Assume that the star is a uniform sphere at all times, and that the lost mass carries off no angular momentum. $\times10^{9 }$ $rev/day$