4. The sun has a rotation period (about an axis through its center) of about 25 days,rather than the one day for our earth. In about 5 billion years, the sun willbecome a red giant star and its radius will expand to about the orbit of the earth.Determine the new rotational period of the sun once it becomes a red giant. Hint:If your system is the sun, then there are no external torques acting on thesystem during this process. Also, assume the sun (and the red giant) to be solidspheres.

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Answered: The sun has a rotation period (about an…

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