Surprising Water Bridge Physics | Bouyancy And Boats
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- Опубліковано 16 вер 2016
- In this video I show you the awesome science behind water bridges. I expose a very intriguing fact, that is that you don't need to design water bridges to hold the weight of the boats that cross it. This is a very unique phenomenon with water bridges. I talk about the Magdeburg Water Bridge. This is a large navigable aqueduct in central Germany, located near Magdeburg.
Surprisingly this bridge and others like it only need to hold the weight of the water, but not the weight of the boats! Watch the video to find out why!
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I was thinking about this for a couple of days and it was driving me crazy. Think about the implications of this. Every boat in a canal theoretically displaces some amount of water along the entire continuous segment of the canal. I assume the effect of those boats ends as soon as the water drop off or steps up, that is, at a lock. If you have dozens narrowboats in a marina somewhere in the English countryside, a water bridge 10 miles away feels some amount weight for every boat in that marina. As soon as you launch a new narrowboat into the canal, it's weight is added to the entire length of the canal (between the first upstream and downstream locks). It must take some time for that weight to travel up/down the canal...
I've been trying to figure this out for years and finally ran into this video, my life is complete.
glad I found your channel... You're the new mr. science! Thanks for sharing the info...
A mr. science that can´t account for the weight of his boat in his final weighing and thinks that 10g of water is stuck to his dish.
This was great! I was just debating this exact thing with some friends. So interesting!
I am civil engineering student. This is much needed information for me. Thanks 👍👌
This video may be 7yrs old but I'm so glad I found it! My 2 are going to love your channel! Big thanks from a grateful mother trying to balance the nothingness they're indoctrinated with at school with awesome content that stimulates their natural curiosity!
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I just watched a TV programme where the presenter said that an aqaduct had to be able to support the weight of the bridge structure plus the water and the weight of any boats crossing it. I knew he was wrong as a boat displaces it's own weight in water in order to float. You confirmed it experimentally which I like.
oh wow way cool! loved it and thanks for making this video!
I think some of the 10g loss might also be the part of the boat that extended above the surface of the water
Wonderful demonstration of the science behind the water Bridge....
Great ! very Informative
You are so smart and I love watching your videos. Hope you make more. Your content are amazing.
Superb!
Really like your channels , very enjoyable Indeed , my question would be, regarding the bridge , do they allow for build up of silt from the water flow and possible debris or boating accidents , i.e sinking boats , when they design and build the bridge regarding the weight issue .
Thanks for the hard work you put in !!
Much appreciated from this UK fan
awesome...
That was neat!
I always wondered about this but it got clear for me rn
if you have a perfect sphere of mirrors on the inside. and it were possible to shine a light in there without disrupting the perfekt mirror room. how long would the light bounce inside there before the energy of the light was all used.
Good question! If you have an absolute perfect mirror. This means that no photons of light are ever absorbed by the mirror, then the light will forever bounce off the mirror ad infinitum. However, a perfect mirror does not exist and is in fact an impossible feat. There is always a slight chance that a photon of light is absorbed by the mirror. So, lets assume we just have a really good mirror. In this case lets say it reflects 99.99% of photons and absorbs only 0.01% of photons (the absorbed photons then becomes heat in the mirror). Even in this case, if we have a spherical mirror that is 1 meter in diameter, since light moves so fast (300 million m/s), the light would all be absorbed in less than 33 microseconds (For reference a human eye blink takes about 350,000 microseconds). So, no matter how good you make your mirror, light will always be absorbed faster than the blink of an eye!
The falkirk wheel uses the same principle. You can have multiple boats on one side and none on the other but since they displace their own weight in water the weight of both sides of the wheel remain equal.
good...
I never Knew that! Btw, what would happen if there was too much water? Like from rainfall or something
You can cut a wine bottle in half length wise, poor water inside and balance it at its center of mass and you can then add a weight to one side and as long as it floats the bottle won't fall over.
We have aqueducts like that in the Netherlands aswell. After Genshin Impact's Fontaine update I just needed to know how these bridges work.
Never gonna drive a car over a water bridge again
Bruh u did? Lol
Magdeburg water brigde enables a canal to cross a river - not another canal. The river Elbe is between 11 to 18 meters below the canal, depending on the water height in the river, but it infamous for having not anough water for larger ships to pass.
it was a cool demonstration. i think that is called the arquimedes princile right? Well here is my question if a hose is throwing water at an angle of 20° and with a velocity of 20 m/s, at what altitude will the water arrive to a wall one meter away from the hose?
I have a feeling that I'm being asked to do your physics homework...but just this one time I'll help you out since I can't resist a good physics problem:) So I'm assuming that the hose is on the ground aimed at a 20 degree angle. In that case given that the time it takes the water to hit the wall would be about 0.05 seconds (t=d/cos(20deg)*v), then you just solve for the height (h=v*sin(20deg)*t-0.5*g*t^2) and get about 0.35 meters!
that wasn't a homework, it was a problem of a physics contest that my teacher couldn't answer
Make some videos on quantum entanglement
The fact that the boats float, ( at least I hope they do) means that they’re lighter than the water and displacing it. So, if the bridge can hold the necessary amount of water to function, then in will hold up the canal with boats crossing.
It is a great video, sir.But I have doubts regarding the loads.
1.How do you determine the wave action or load due to wave action on the water?
2.To compensate for the minuscule load due to ship can we reduce the amount of water in the bridge to reduce the load on the structure.
3.Last but not the least.Is the MAGDEBURG WATER BRIDGE a prestressed structure or a conventional structure?
Well the weight of the boat in the entire body of water is spread across the entire bottom of the water not just the bridge that is why it is such a small amount of extra load on the bridge. Water level rises evenly so it adds weight everywhere evenly.
To calculate the load added by waves you would have to do really complex math but in most cases it evens out because a wave has a peak and valley that cancel out. It is the wake in front (I think wake is behind don´t know what it is called in front) of the boat that adds load as it pushes the water level higher than what it would normally be. You would have to calculate the shape of that wave above the normal high water level which should look like a triangle times the width of the channel - the volume of the part of the boat protruding into that wave but only the part in the wave above the normal high water mark . Like this >/\- The first > is the bow of the boat pushing the water /\ is the wave and - is the normal high water mark with no waves. So the volume of water above the - is the extra load added to the bridge.
Wow that was pretty cool! Do you own a boat yourself?
Nope, not yet:)
alright. that was pretty cool. and that's a nice shirt. how do you think of this stuff??? of wait. you are jimmy joe. it's what you do. Q&A ..... what are your thoughts on "global warming"???
Ha ha,yes this channel is just an outlet to my normal thoughts. Hmm global warming...What I should do is present all the evidence for and against global warming and let the people choose:)
Hey i dont get a thing about relativity that it is based on the fact that velocity of light is constant in all frames .
So can u plz make a video on that
If you are moving in the same direction as a laser at light speed than the light will take 1 second to move 299792458 meters, for someone standing at the source of the laser it will move the same distance in 1 second, but they will observe the light moving a shorter distance in that amount of time relative to you, although that is because for you it hasn’t been 1 second yet. In short their seconds are faster than yours. By the time the light has traveled 299792458 meters for you, the light would have traveled 599584916 meters for them, because for them it has been 2 seconds.
now in 2021, I can say your experiments will be more fastidious
Why we don't build each bridge with a layer of water and a floating asphalt on top :D
the bridge would be to heavy
Cost is probably the reason you would probably get
But the problem is, you have to have connected both ends of the water in sea or lake, otherwise your water is going to spill over the edges when there is enought weight on boat which stays on surface. And that leads to other problems like water level changes and size of the "bridge" and canal width which should be enormous if you want to move bigger loads.
but it changes evenly across the surface so it would really need to cover a large portion of your lakes to cause a problem. You will have a traffic jam long before that.
I was wondering how do the spiders make spider webs?
I don't think so Tim...😂
River elbe under this kanal
Doesn't it just displace the water that would be there?
Q - at what age did you first know that you wanted to get into or study science?
I guess it would be fine as long as a boat never sank on it.
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Beacuse the boat is flouting on the water
Dead simple. Almost no thinking needed. A floating boat displaces exactly as much water as the boat weighs. Design it without boats.