ChatterBank0 min ago
Gravity at the centre of the earth
12 Answers
Is all the matter at the centre of the earth weightless?????
Answers
Best Answer
No best answer has yet been selected by caracasjim. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.I have speculated that since the earth is spinning, the angular momentum at the equator would counter the effect of gravity some but that this would effect the shape of the earth so as to equalize this difference. Perhaps electromagnetic attraction does not allow the shape of the earth to completely compensate? Why do things weight more at the poles? How does this difference compare to the effects of tidal pull of the sun and moon?
yeah the a level students have to work out the field inside an arc of a circle . And when the whole circle is considered, the atraction from the nearer arc is exactly counter balanced by the further greater arc.
obviously if it is true for a circle by doing a spinny sort of intergration, it will be true for a shell.
this is true for any inverse square law
and so der daaah... the electric field inside a hollow ball is zero and so is the magnetic field, as well as gravity.
a sort of good mornings work for an a level student