Compare an earthquake with a Richter scale magnitude of 5.5 to one with a magnitude of 7.5. A. 2 times stronger
B. 1000 times stronger
C. 100 times stronger
D. 20 times stronger

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?