[填空题]
Suppose a star the siz.m0 n zpw6lwcrm +xr(0e of our Soe ( -hz1+eg jisk vi5q6*h,f2ztoai -un, but with mass 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 rotatione5z(ii jh26vi1 -o,ka -s+gohfe*t q z speed be? Assume that the star is a uniform sphere at all times, and that the lost mass carries off no angular momentum. $\times10^{9 }$ $rev/day$