Q: If you could drill a tunnel through the whole planet and then jumped down this tunnel, how would you fall?
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The highest air pressure we see on the surface of the Earth is a little under 16 psi. Assuming that there’s no air in the tube, you’re still in trouble. This is an effect of “coriolis forces” which show up whenever you try to describe things moving around on spinning things (like planets). Because the Earth is turning, how fast you’re moving is proportional to your altitude. So, as you’re falling .