Why aren't tides the same everywhere? Detailed answer

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Why aren't tides the same everywhere? Detailed answer

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Why aren't tides the same everywhere?

Have you ever been on a beach where, in low tide, you have to walk quite a distance out to sea to even get into knee-deep water? And yet there are places where you can hardly tell high tide from low tide. The reason for this has nothing to do with the influence of the moon. Tides are due to gravity. In the same way that the Earth pulls on the Moon, the Moon also pulls on the Earth, but with much less force. Due to the influence of the Moon on the Earth, the waters of the ocean are attracted towards the Moon and form a bulge or wave. This results in a high tide.

Water on the opposite side of the Earth is much less attracted to the Moon because the Moon is farther away, and so a bulge forms here as well. Therefore, a high tide is observed both from the side facing the Moon and from the opposite side of the Earth. As the Moon passes around the Earth, these two water "humps" and lower water levels continue to remain approximately in the same position relative to the Moon. And if the surface of the Earth were completely covered with water, then the alternation of high and low tides would be very regular.

But many other factors interfere with this. One of them is huge arrays of continents. They cause tidal currents that curve around coastlines and accumulate in certain places, such as bays. On gently sloping coastlines with a straight coastline, the rising tide has enough room to spread and does not rise very high.

But where the tide meets a narrow bay or channel, it cannot spread wide, and therefore the water can reach a great height. For example, in the Bay of Fundy, the difference between high and low tide can be more than 21 meters. At the same time, at high tide in the Mediterranean Sea, the water does not rise higher than 0,5 m.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

What is a mold and casting mold?

Many of the things we use in everyday life are made with molds and molds. A mold is a device for extruding shaped parts of a certain shape from sheet metal or plastic. If you have ever watched how cookies in the form of stars and hearts are cut out of rolled out dough, then you have an elementary idea of \uXNUMXb\uXNUMXbhow this device works.

A casting mold is a device for casting figured parts made of metal, plastic, and the like. These substances in a liquid state are poured into a hollow mold (mould) and remain there until they solidify. A jelly mold is the simplest example of a mold. Molds are used in industry to make parts that are difficult to make with other methods.

For example, parts of a passenger car, such as a bumper and a hood. Casting molds are also used in industry to make parts such as refrigerator handles, radio housings, and car grilles. The production of such parts by conventional methods (cutting, sawing, drilling, and so on) will take too much time and will consume too much material. With the help of molds and casting molds, they can be made as easily and quickly as cookies. In addition to the manufacture of complex profiles, the mold is used when it is necessary to make a large number of identical parts. The advantage of this method is also that the details in this case do not need special refinement.

Complex castings sometimes need to be sanded and polished to eliminate roughness and roughness. And sharp corners are filed on stamping. Forms usually consist of two parts. When connected together, they form the desired profile. Casting makes only the outer part of the part. Stamping can be done both external and internal parts.

Did you know that molds were being used as early as 650 BC. e. and that Greek blacksmiths used them to make silver coins? A piece of silver was placed in a template cut from a harder metal and flattened with hammer blows, and at the same time the pattern from the template was transferred to it.

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Soft electronics has become multi-layered 22.08.2018

Soft PCBs could change the way we think about electronic devices. Flexible and soft electronics will allow you to create medical sensors that you can comfortably wear on yourself without fear of breaking. But how soon will we have such devices?

Various research groups have repeatedly demonstrated prototypes of soft electronics. As a rule, in such cases, they try to combine existing electronic components with a soft and durable substrate, or they try to create new flexible transistors and microcircuits. The employees of the University of California at San Diego have taken another step towards the release of "electronic-soft" technologies beyond the walls of laboratories. They took the first path by incorporating microscopic components into elastomer substrates, a polymer with high elasticity and viscosity.

However, unlike previous attempts, this time the soft board was made multi-layered. Previously, this did not work: the main difficulty was that it was not possible to create strong electrical connections between the layers. In ordinary, solid boards, this is no longer a problem, modern printed circuit boards can have several dozen layers, and the power of devices can be increased without changing their size.

To create a soft "layer cake", Zhenlong Huang (Zhenlong Huang) and his colleagues used laser technology: holes were burned into the thinnest elastomer substrates and then filled with a conductor material. Inside the layer, the components are connected using flexible copper threads twisted into spirals, which the authors of the work called "bridges"; There were four layers in total.

A soft device the size of a coin was literally stuffed with functions: a wireless communication module and a whole set of sensors (accelerometer, etc.) fit in it. A soft board was attached to the neck, head, hands, which made it possible to take an electroencephalogram, monitor heart rate and breathing. With the help of the board, it was also possible to control the robot's hand, tracking nerve impulses in the hand of one of the researchers: the robot moved its "fingers" and "hand" after the person.

In the future, the California laboratory intends to further increase the number of layers. Perhaps thanks to this technology, amazing new medical devices and all kinds of agile and agile soft robots will appear faster than we think.

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