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LEGO Movie 70808 - Inseguimento sulla Super Cycle LEGO Movie 70805 - Divora-Spazzatura Visualizza la sezione Domande e risposte Consulta entrambe le recensioni cliente Principali recensioni dei clienti Vedi entrambe le recensioni cliente (dalla più recente) Ricerca articoli simili per categoria Giochi e giocattoli > Costruzioni View all Top LEGO Toys View all LEGO Angry Birds LEGO DC Super Heroes LEGO Marvel Super Heroes Free next day Click+Collect*File under "News to Me": you know that old story about how northern hemisphere toilets flush counter-clockwise, and southern hemisphere toilets (and buckets, drains, and such) flush clockwise, due to the Coriolis effect? Today I learned that while the Coriolis effect is significant for hurricanes, it's not strong enough to make toilets flush in different directions at different points on the Earth. The real cause of "backwards"-flushing toilets is just that the water jets point in the opposite direction.
(Mind blown even more because this was the inciting event on a Simpsons episode, and everybody knows cartoons are never wrong.) So there is indeed a Coriolis effect, and we see it on grand scales -- hurricanes in different hemispheres tend to rotate in different directions, because the underlying Earth is spinning, and the effect is exaggerated as you move farther from the equator. This Penn State science page by Professor of Meteorology Alistair B. Fraser explains: On the scale of hurricanes and large mid-latitude storms, the Coriolis force causes the air to rotate around a low pressure center in a cyclonic direction. Indeed, the term cyclonic not only means that the fluid (air or water) rotates in the same direction as the underlying Earth, but also that the rotation of the fluid is due to the rotation of the Earth. Thus, the air flowing around a hurricane spins counter-clockwise in the northern hemisphere, and clockwise in the southern hemisphere (as does the Earth, itself).
In both hemispheres, this rotation is deemed cyclonic. If the Earth did not rotate, the air would flow directly in towards the low pressure center, but on a spinning Earth, the Coriolis force causes that air to be deviated with the result that it travels around the low pressure center. So it works on large scales. But on small scales (like in your toilet, sink, or bucket), the rotation of the Earth itself (at a decidedly pokey rate of one rotation per day) is much weaker than other forces -- like the force of water jets in a toilet, or the force of water hitting slopes in a sink. In tracking down where this drain-direction myth originated and how it got so firmly lodged in the heads of people like me, many sources discuss the (otherwise awesome) Michael Palin documentary Pole to Pole, in which Palin visits the equator in Kenya and observes a tourist trap in which a man "demonstrates" (via fakery) the draining of water in different ways on the equator itself, and just north and south of it.
Palin doesn't point out that it's fake. I remember seeing this documentary when it came out, and it may be where I picked up the notion -- it seems like such an appealing demonstration of science, such an "ah-ha!" moment that of course the rotation of the Earth should cause such changes in draining water! We're all tiny ants on a huge spinning globe! Again, Fraser has a good write-up; [T]he faker must be forcing the rotation by other means, and by a sufficiently unobtrusive way that the busloads of tourists do not spot the means. Indeed, a colleague of mine, who witnessed the performance first hand and knew it was a cheat, was not able to spot how the fraud was perpetrated. (It is an interesting sidelight that when back on the bus, he informed his fellow tourists that they had just witnessed fakery --- the Earth did not cause the rotation they had just seen --- there was widespread disappointment. The tourists preferred the fantasy to the reality.) Fraser proceeds to explain how you can fake it yourself.
According to various sources, it is possible to demonstrate a Coriolis effect on water on a small scale, but only under extremely controlled circumstances -- involving predictably shaped water vessels, long periods of time of waiting for water to become as still as possible, carefully removing a stopper in the bottom of the vessel without adding spin, and other such crazy stuff. But in your typical toilet or sink, the Coriolis force is so small as to be undetectable relative to other forces. Even holding a bowl of water and turning around introduces sufficient spin to get things going in one direction or another. Go to your bathroom now and observe water going down the drain -- any drain you want. Depending on the efficiency of your plumbing, you may need to stop up the drain, fill the basin, then unplug it and wait. (It might also help to have something lightweight floating in there, to mark any motion -- a few bits of tissue may work, or a matchstick or two.) Observe whether the draining water forms a clockwise or counter-clockwise spiral.