[填空题]
Suppose a star the size of-w)vwok8 l 8le:9qql tynh y:r7ip8dfa-uc: )our Sun, but with mass 8.0 times as great, were rotating at 7yh: tn:u 9idflc-q r:8 pyaq)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? Assume that the star is a uniform sphere at all times, and that the lost mass carries off no angular momentum. $\times10^{9 }$ $rev/day$
