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Statement of a problem № 3240

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A star has initially a radius of 6x10^8 m and a period of rotation about its axis of 30 days. Eventually it evolves into a neutron star with a radius of only 10^4 m and a period of 0.1 s. Assuming that the mass has not changed, find the ratio of initial and final (a) angular momentum and (b) kinetic energy.

Solution:
A star has initially a radius of 6x10^8 m and a period of rotation about its axi

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