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1. A spherical star of one solar mass and R = 0.5 solar radii rotates once every 60 days. At the end of its

1. A spherical star of one solar mass and R = 0.5 solar radii rotates once every 60 days. At the end of its nuclear burning it collapses to a radius of 70 km. If 4 of the mass is lost in the collapse, what is the final period of rotation of the star? (The radius of the Sun is 696,000 km.)

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