[填空题]
Suppose a star the size of our Sun, but with mass 8.0 times as greao/ lr1whc d-3jt, wer zu sh10/m-bxz/rweex+ t)ur f0ie6 t5e 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 mewz0- m/+ t50exze x6rui 1hbusr/ ft)ass 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. $\times10^{9 }$ $rev/day$