[填空题]
Suppose a star the size of our Sun, but 3 z ko wx cv3*;b9 b-u,zhntwhjgx2f7*with myy:hbxa: p26f ass 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 pfyyx 2 h:6:pbarocess, 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. $\times10^{9 }$ $rev/day$