Question
Sat December 15, 2012 By:
 

Why do we consider earth to be point mass knowing that mass of earth is uniform?

Expert Reply
Sun December 16, 2012
there is no such thing as a point mass in the universe.
even an atom or an electron has a density.
it depends on what frame we are talking about.
eg. earth can be considered as a point mass in universe where distnces are very large and much bigger things are present.
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