If you drop an object through a hole in the Earth stretching from the North Pole to the South Pole, it would oscillate back and forth about 17 times per daypic.twitter.com/crCfBFK2qp
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Just assume no resistance.
that's not what does it, it's the coriolis force that would do it.. Any point off axis of the rotation will have an additional angular velocity
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You're right. How much do you think that Coriolis effect would affect the oscillation? I should try to work out the math.
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depends on where you're standing. the closer you are to the equator the faster it will hit a wall
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