momentum is conserved
initial momentum=finalmomentum
2/5 *M*6.96E8wi=2/3*M*6.37E6*wf
wi=1rev/25days
wf=wi*(6.96E8/6.37E6)
= about 4 revs/day or 27.46rad/day
A star the size of our Sun runs out of nuclear fuel and, without losing mass, collapses to a white dwarf star the size of our Earth. The radius of our Sun is 6.96×108m , the radius of Earth is 6.37×106m
If the star initially rotates at the same rate as our Sun, which is once every 25 days, determine the rotation rate of the white dwarf.
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