How many parts are soccer ball tires made from? Detailed answer

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How many parts are soccer ball tires made from? Detailed answer

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How many parts are soccer ball tires made from?

The tire of a modern soccer ball is made of 32 parts: 20 hexagons and 12 pentagons. The ball must have a circumference of 68,7 to 71,5 cm and weigh between 369 and 453 g.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

How do we distinguish colors?

Taking color photographs is a physical process. But the perception of color by a person is connected with his psyche.

The eyes receive some visual information (but do not "see" in the literal sense of the word), it is transmitted to the brain, which processes it, and only after that we are able to distinguish objects.

Although we "see" with our brain and distinguish colors with it, the eyes perform a very important and irreplaceable function. They perceive seven colors: red, orange, yellow, green, blue, indigo and violet. Some retinal receptors are irritated by twilight light, others are only irritated by bright light, and color vision is associated with them.

How does the eye distinguish colors? This is how the Yang-Helmholtz theory of color vision explains it. The eye contains three types of nerve cells that react respectively to red, green, blue-violet color.

Thus, if all three types of nerve cells receive the same stimulation, we see white. If the eye receives mainly green light, the cells responsible for the green part of the spectrum are excited more than others, and we see green. When the object is yellow, "green" and "red" cells are stimulated.

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Relativistic contraction of the electric field 02.12.2022

Scientists at Osaka University's Institute of Laser Engineering have used ultra-fast electro-optical measurements for the first time to visualize the contraction of the electric field surrounding an electron beam traveling at near-light speed and demonstrated the generation process.

According to the theory of relativity, to accurately describe the movement of objects flying past the observer at a speed close to the speed of light, it is necessary to use the "Lorentz transformation", which combines spatial and temporal coordinates. The Dutch physicist was able to explain how these transformations lead to self-consistent equations for electric and magnetic fields.

Although the various effects of relativity have been proven many times with a very high degree of experimental accuracy, there are still parts of the general theory of relativity (including special relativity) that have yet to be revealed in experiments. Oddly enough, electric field compression is one of them: the modern understanding of electromagnetism is based on the principles of Einsteinian physics.

Now, a research team at Osaka University has demonstrated this effect experimentally for the first time. They measured the profile of the Coulomb field in space and time around a high-energy electron beam generated by a linear particle accelerator. Using ultrafast electro-optical sampling, they were able to register the electric field with extremely high temporal resolution.

Previously, the Lorentz transformations of time and space, as well as energy and momentum, were demonstrated in experiments on time dilation and rest-mass energy, respectively. Then physicists considered a similar relativistic effect, which corresponds to the Lorentz transformation of electromagnetic potentials.

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