Holy Shit! Coriolis Effect between Northern and Southern Hemisphere seen in feet - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: December 08, 2023, 08:58:19 pm
content: Gotta see this... Holy Shit! Coriolis Effect measured/seen in draining water between Northern and Southern Hemisphere in only a few feet apart from each other.I had no clue the switch was sooooo bloody sensitive compared to the size and scale of the entire planet Earth.I would have figured that at least a few miles separation from the equator would have been needed to see anything at all, not 10 feet.OK, it appears to be a scam.The actual effect measured by Veritasium:https://www.eevblog.com/forum/chat/holy-shit!-coriolis-effect-between-northern-and-southern-hemisphere-seen-in-feet/msg5211456/#msg5211456

author: iMo
author_rank: Super Contributor
timestamp: December 08, 2023, 09:03:57 pm
content: A CW and CCW spiral in the pipe would do it, imho..

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 08, 2023, 09:08:25 pm
content: Junk -- IIRC, calculations show the size of tank required to observe the effect is some ~m large, and would need to sit perfectly still for weeks before being opened very carefully so as not to disturb the flow upstream of the valve. The spin would only become evident by the time the tank is nearly empty.It would be responsible to add an actual citation, preferably paper, showing the above claims though.Tim

author: ataradov
author_rank: Super Contributor
timestamp: December 08, 2023, 09:18:59 pm
content: Yeah, this is just a tourist trap. There is no way you setup a clean experiment in an environment like this.And "equator" is not a neat straight line with a known precise location. At least for the purposes of the Coriolis effect.

author: 807
author_rank: Frequent Contributor
timestamp: December 08, 2023, 09:22:15 pm
content: It has long been disprooved that water spiraling down a plug hole has anything to do with the Coriolis effect...https://www.loc.gov/everyday-mysteries/physics/item/does-water-go-down-the-drain-counterclockwise-in-the-northern-hemisphere-and-clockwise-in-the-southern-hemisphere/https://theconversation.com/does-the-direction-water-rotates-down-the-drain-depend-on-which-hemisphere-youre-in-debunking-the-coriolis-effect-in-your-sink-208761

author: SiliconWizard
author_rank: Super Contributor
timestamp: December 08, 2023, 09:29:20 pm
content: As I remember, the only way of experimentally showing the Coriolis effect with simple equipment is to build a pretty large pendulum. As shown above, this sink stuff is just scam.

author: BrianHG
author_rank: Super Contributor
timestamp: December 08, 2023, 09:35:42 pm
content: Ahh, Veritasium attempted a real measurement of the effect on draining water in this video:Now, this is the authentic minuscule effect I expected to be observed only over a huge distance, hundreds of miles above or below the equator.

author: iMo
author_rank: Super Contributor
timestamp: December 08, 2023, 09:36:18 pm
content: Quote from: SiliconWizard on December 08, 2023, 09:29:20 pmSo, how would Foucault pendulum work +/- 10feet off the equator?Any math handy?PS: wiki:QuotePS1:w = 360 * sin (0.0000274) = +/- 1.72159E-4 degree per sidereal day..

author: EPAIII
author_rank: Super Contributor
timestamp: December 09, 2023, 10:06:57 am
content: It is far more likely that the three basins were chosen for the slight imperfections in them that influence the direction of the rotation of the water. And the middle one, "on the equator" was probably the hardest one to "tune up" to get zero rotation.It is quite possible they all have some fins inside the drain tubes which direct the water.If you have ever played with a sink full of water and started the rotation when the stopper is pulled, you may have noticed that it does not take much of a start to get it to go one way or the other. Once it starts going one way, the effect is amplified by the velocity of the water going down the drain so it goes faster and faster as it drains. Try it in your bathroom or kitchen. Drain some sitting water a few times to see which way it wants to go. Then, do a run and give it a bit of a nudge in the other direction and watch it go that way just as fast.Oh, and if you want to see the effect more easily, use a larger diameter drain. The larger the drain, the greater the effect because there will be more amplification.

author: electr_peter
author_rank: Unknown
timestamp: December 09, 2023, 11:16:30 am
content: Nice trick for local attraction. Spin in water bowl can also be skilfully induced manuallyCoriolis effect is easier to visualize using bigger objects as demonstrated by professor Clarkson