Why do we sometimes think that the wheels of a moving car are spinning in the opposite direction? Detailed answer

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Why do we sometimes think that the wheels of a moving car are spinning in the opposite direction? Detailed answer

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Why do we sometimes think that the wheels of a moving car are spinning in the opposite direction?

When watching a moving car in some videos, it seems to us that its wheels are spinning backwards. This is a manifestation of the stroboscopic effect due to the inertia of vision. You can choose such a driving speed that in the time of 1/24 of a second (the standard duration of one frame of a film) the wheel makes several turns, but just barely reaches its previous position. Since the human eye is guided by the spokes of the wheel, we get the feeling that it is slowly rotating in the opposite direction. This phenomenon can also be observed in real life - for example, at night on the street, which is illuminated by lanterns with low-frequency pulsation.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

What building in New York cost the Americans, because of corruption, one and a half times more than the purchase of Alaska?

The construction of the three-story New York County Courthouse at 52 Chambers Street cost one and a half times more than buying Alaska from Russia due to the total corruption of the authorities that arose thanks to the leader of the organization of the Democratic Party of the State of New York, William Tweed. In the end, he became so compromising the Democrats that his party members became the main whistleblowers of Tweed. After the court verdict, Tweed died in Ludlow Prison, on the construction of which he also illegally enriched himself.

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The material from which the electrodes of lithium-ion batteries are made is critical to the capacity of the battery. Until now, the negative electrode is usually made of graphite, the layers of which are capable of storing lithium atoms. However, the capacity of graphite is limited to accepting 1 lithium atom per 6 carbon atoms. In comparison, silicon can take up to 10 times more lithium, but unfortunately, during this process, silicon expands greatly, which drastically reduces such important characteristics of lithium-ion batteries as durability, the ability to quickly charge and deliver powerful current.

Looking for an alternative to pure silicon, German scientists synthesized special three-dimensional structures consisting of boron and silicon (LiBSi2). Like carbon atoms, boron and silicon atoms are connected in a special structure in the form of a tetrahedron, but unlike diamond, they form channels that can store lithium atoms.

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It should be noted that the Germans made their new type of electrode in the laboratory of Arizona State University, where it was possible to create a pressure of 100 atmospheres and a temperature of about 900 degrees Celsius. Thanks to this, it was possible to produce a "diamond" capable of holding lithium.

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