[填空题]
Suppose a star the size of our Sun,4y89x9 -c.2celbffp hl7yde b fy :j0s but wiqistboe/ /*1 jrfoeoo):ek*: th mass 8.0 times as great, were rotating at a e /oe)ob /o qj1*tri:*skofe: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. $\times10^{9 }$ $rev/day$