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Science Homework Help. Suppose two worlds, each having mass M and radius R, coalesce into a single worl

Suppose two worlds, each having mass M and radius R, coalesce into a single world. Due to gravitational contraction, the combined world has a radius of only 

3
4

R.

 What is the average density of the combined world as a multiple of ρ0, the average density of the original two worlds? 
 ρ0


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