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gaobo9109
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Homework Statement
A spherical star of uniform density p and radius R is formed by the condensation of the interstellar dust from large distance due to gravitational forces. Find the energy change that occurs at some intermediate stage as the radius increases from r to r+dr
Hence derive an expression for the total loss of the gravitational energy during the condensation
Homework Equations
The Attempt at a Solution
I don't quite understand this question. It mentions that the radius of star increases from r to r+dr, but the question ask for loss of gravitational potential energy during condensation. So does the star expand or contract? I don't know what the question is trying to ask. Can someone explain to me? Thanks