Well close but can you take the Earth in isolation? The moon, sun and everything else will move the CoG about so gravity will not be zero at the centre very often.
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7 years ago
OT (?): Lithostatic pressure ...
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7 years ago
The strength of the gravity is irrelevant. It pulls the ball towards the centre of the Earth, ending up at the deepest part of the tunnel because anywhere else would get a sideways component. Make a model with a rubber band.
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7 years ago
TNP has given the best answer in terms of what happens with a real version of the Earth. Mine applied to a simplified version where material density was uniform.
And don't just take it from me or TNP. See:
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7 years ago
WEll why not go the whole hog and say that a straight line is one parallel to the earth's surface?
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7 years ago
It is not
It pulls the ball towards the
Isn't an accurate model.
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7 years ago
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It doesn't really matter as the tides demonstrate stuff isn't pulled towards the Earth's centre but to the CoG of the system with the Sun and Moon having a significant effect.