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- If you quadruple the radius of a sphere, how does its massdensity change?If the sun were half as massive (M=0.5) then the period of the Earth's orbit would be: 1) 0.5 years 2) 0.7 years 3) 1.4 years 4) 0.4 yearsOn planet LV- 426 it is observed that a person’s weight is the same as it is on Earth, but the planet has a radius half that of Earth. Which of the following must be true? -the mass of LV-426 is ¼ that of Earth -the mass of Earth is ¼ that of LV-426 -A rock dropped from 10m would hit the ground faster on Earth -A rock dropped 10m would hit the ground faster on LV-426 Why?