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The star 61 Ursae Majoris's mass is 1.7 10^30 kg, its radius is 6.5 10^5 km, and it has a rotational period of

The star 61 Ursae Majoris's mass is 1.7 ✕ 10^30 kg, its radius is 6.5 ✕ 10^5 km, and it has a rotational period of approximately 17 days. If 61 Ursae Majoris should collapse into a white dwarf of radius 6.8 ✕ 10^3 km, what would its period (in s) be if no mass were ejected and a sphere of uniform density can model 61 Ursae Majoris both before and after?

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