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During its evolution, a star of 1 solar mass (the mass of our Sun) expands to 3.33 times its original radius. Assume that, during this expansion:

During its evolution, a star of 1 solar mass (the mass of our Sun) expands to 3.33 times its original radius. Assume that, during this expansion:
- the star has no appreciable loss of mass
- the mass is uniformly distributed through the volume
- the star remains spherical during the entire process

a) If the star was initially spinning with a period of To = 36.9 days: find Tf, the period of rotation of the star after the expansion
1 days

b) Calculate the ratio R., where


R = (final kinetic energy of the star)/(initial kinetic energy of the star)


NOTE: You may assume there is no translational motion.

R = 2
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