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rock.freak667
rock.freak667 is offline
#2
Feb24-13, 04:25 PM
HW Helper
P: 6,213
The gravitational force of attraction between two point masses, M & m2, separated by a distance 'r' is given by:

F= GMm/r2

If r=0, then you don't have two masses anymore but one mass. In which cases, gravity would vary with depth of the planet. Read more here.