(Answered) A star of radius 78 times 105 km rotates about its axis

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A star of radius 7.8 × 10⁵km rotates about its axis with a period of 66 days. The star undergoes a supernova explosion, whereby its core collapses into a neutron star of radius 13 km. Estimate the period of the neutron star (assume the mass remains constant).

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