[填空题]
Suppose a star the sf*hm j cz2ehua+;lfnn,ggm71g-tb, ) ize of our Sun, but with mas csea42zh3 yq5igm( w;s 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 would its rotation speed be? qz4;(s 2 mah5ig e3wcyAssume that the star is a uniform sphere at all times, and that the lost mass carries off no angular momentum. $\times10^{9 }$ $rev/day$