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Homework Statement
Under some circumstances, a star can collapse into an extremely dense object made mostly of neutrons and called a neutron star. The density of a neutron star is roughly 10^{14} times as great as that of ordinary solid matter. Suppose we represent the star as a uniform, solid, rigid sphere, both before and after the collapse. The star's initial radius was 9.0×10^5 km (comparable to our sun); its final radius is 16 km.
If the original star rotated once in 31 days, find the angular speed of the neutron star.
The Attempt at a Solution
Rotation of Original Star: (31 days/rev)(86400s/1day)(1rev/2pi) = 288770.73 rad/s
My first attempt was proportions
[(288770.72 rad/s) / (9.0x10^5 km)] = [(w)/(16km)]
w = 5.13x10^10