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A star is rotating with a period of 34.4 days. At the end of its lifetime...

A star is rotating with a period of 34.4 days. At the end of its lifetime it sheds its outermost layers, leaving a core of radius 5.36×108m. The core then collapses into a white dwarf of radius 4.81×106m.Assuming that no torques have acted on the core, find its rotation period after the collapse.

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