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by davelondon
919 days ago
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> Fg = Gm1m2/d^2, you get infinite force when a marble (mass 1) is at the center of a planet (mass2) A non-point mass only approximates to a point mass when you're not inside it. The gravitational effect of being inside a shell is nothing... so as d tends to zero the mass that's not a shell also tends to zero, so you actually get zero force. |
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