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The star Tau Ceti's mass is 1.6 ✕ 1030 kg, its radius is 5.5 ✕ 105...

The star Tau Ceti's mass is 1.6 ✕ 1030 kg, its radius is 5.5 ✕ 105 km, and it has a rotational period of approximately 34 days. If Tau Ceti should collapse into a white dwarf of radius 9.7 ✕ 103 km, what would its period (in s) be if no mass were ejected and a sphere of uniform density can model Tau Ceti both before and after?

_______ s

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Answer #1

Since no external torque acts on the star, its angular momentum remains conserved.

Now, time period is given as

Thus,

and

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