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A jojo, with a slight twist methinks You have those 'imaginary forces' to consider too, as the Coriolis force
Adam McGuirk asked the Naked Scientists: If you could dig a hole straight through the Earth and decided to jump into the hole, what would happen when you reached the centre point?What do you think?
Quote from: thedoc on 12/03/2012 08:50:03Adam McGuirk asked the Naked Scientists: If you could dig a hole straight through the Earth and decided to jump into the hole, what would happen when you reached the centre point?What do you think?hi, im glas i found this question, years ago , arround 2004 i think i asked myself this exact question. Adding to it:what is gravity? at the centre of the earth (im in a heat proof tunnel does the earth's mass: shrink me or stretch me.once again, i was about to ask your question on this forum, and was amazed to find it already asked what i learned from the question is: that there is actually no exact understanding og what gravity actually is in phisics, so the question remains valid and i think unanswered.
There is no net force from the body and no stress on the body if it is at the centre of gravity of that body. It is easily provable (by integrating the equations) that the gravitational acceleration (force) inside a massive uniform thick spherical shell is zero at all points inside the shell. Outside of the shell it behaves as if all the mass in the shell was concentrated at the centre of the sphere and when you move through the shell from the outside to the inside the gravitational acceleration (force) falls linearly from the value outside of the shell to zero linearly. There may be slight deviations from this for non uniform, not precisely spherical and rotating bodies but there is always a centre of gravity where the forces are zero.
2. You would hit the side of the hole. At the equator you are doing at 1600kmph laterally, you would end up going faster than the hole... But if you were to dig pole to pole...
Thank for the demolition of my hypophosis I have learnt not to argue with maths.
It would appear from the graph that a stationary long body at the centre would be compressed.