> Right... So since the Earth's mass is so large, the force of gravity is
more
> or less exactly equal to 9.8006 * m(2)? (Well, at sea level anyway!)
>

I think (?) you've got the wrong 'G' here  - the 9.8 one is the acceleration
due to gravity - the one you need is the universal gravitational consant.

Also for the point charge thing there is a very simple equation (which
totally escapes me at the mo) but I try a web search for "coulombs law"

jim

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