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What happens to the formulas about gravity in the center of the earth?
Im talking about the formulas like Fg=GMMe/R^2, v=sqrt GMe/r and such. Most of theses formulas have r in the denominator and when we hit the center of the earth, these formulas don't exist anymore. So how are we supposed to do problems regarding gravity and the center of the earth.
Ok so then what formulas would I use once we are discussing beneath the earth's surface?
2 Answers
- Anonymous7 years ago
These formula's only work for the effect of one distinct body on another.
Once you enter the earth, there is mass all around you, which causes a force of gravity to pull on you at all sides.
So, if you're in the very middle, there will be an equal amount of earth on all sides of you, pulling equally, cancelling themselves out, so you will float without gravity.
- TechnobuffLv 77 years ago
No r, no gravity.
Gravity at the CM of the earth is 0, because there is equal and opposite gravitational forces in any direction you choose.