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Thread: Drain direction

  1. #1
    SitePoint Zealot LunaC's Avatar
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    Drain direction

    I have a question that has been annoying me for hours...

    If the water goes down the drain in the northern hemishere, and counter-clockwise in the southern....

    what does it do at the equator? Go down straight? Change depending on the season?



  2. #2
    Fried Gold Polymath's Avatar
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    It goes up, due to centrifugal force over-balancing the coriolis force, which reverses the polarity of the neutron flow.

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    SitePoint Guru sowen's Avatar
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    It goes straight down! There is a place in Kenya I think with a sink right on the Equator where you can watch it happen.

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    SitePoint Enthusiast sparq-l's Avatar
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    some one was watching the simpsons today

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    One website at a time mmj's Avatar
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    The forces involved are extremely small, so small that it can be influenced by other factors. The most influencing factor is the movement of your hand as you pull out the plug! This could determine which way the water eventually swirls as it drains. This means that it can be difficult to reproduce the behaviour consistently on individual trials.

    At the equator, it could go in either direction, since the coriolis force is negligible and the direction of the water will be determined by the other factors such as the movement of a butterfly, etc

    By the way, you also asked whether it would change according to the season. This is because the axis of the earth tilts relative to the path of the earth around the sun. The answer is no, because it is the rotation of the earth that influences these forces, not the path around the sun. The earth still rotates around the same axis no matter what the season (what point it is in the path around the sun). It is the tilt that stays the same, and the position of the earth in relation to the sun that changes.
    Last edited by mmj; Jul 19, 2001 at 06:34.
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    e=2.718281828459045235360 HyperBaseball's Avatar
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    Originally posted by sparq-l
    some one was watching the simpsons today
    "Australia, America, Australia, America"- Homer
    lol
    Jason Unger is me.
    "Homer no function beer well without"
    http://www.jasonunger.com

  7. #7
    Procrastinator Extraordinaire lucas's Avatar
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    Originally posted by Polymath
    It goes up, due to centrifugal force over-balancing the coriolis force, which reverses the polarity of the neutron flow.

    thats has to suck for the people on the equator


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