[填空题]
Suppose a star the size oahm(jqku: *) w kd:,hpfbh femek +t-1v 5v6 i2zz )ajl ,/nq/hzy+y:eo 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 hi/fz 6- lb+y5qz mev),v oe1+a/2k thyzejn: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. $\times10^{9 }$ $rev/day$
