Closed coin. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Closed coin. Focus Secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

Pour a handful of coins onto the table, turn away from the table and ask the spectator to start turning over the coins at random, one at a time, saying the word “ready” with each turn.

In this case, the spectator has the right to turn over the same coin several times. Then have the spectator place his or her hand over one of the coins. Turn to the table and say whether the closed coin is heads or tails.

Focus secret:

Before you turn away, you need to count the number of heads. Each time you say “ready,” one is added to this number. If the last sum turns out to be even, then the number of heads, after the spectator has finished turning over the coins, will also be even; if the sum turns out to be odd, then the number of heads will be odd.

By carefully looking at the open coins, you can immediately determine how the closed coin lies.

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Friction turns metal into liquid 22.09.2012

Researchers from Purdue University unexpectedly found that during the process of friction, the metal acquires the properties of a liquid. This discovery allows us to take a fresh look at the seemingly long-studied friction processes and improve the wear and strength parameters of metal parts.

Studying the behavior of metals, scientists observed a wedge-shaped piece of steel sliding on a flat bar of copper. For the first time, scientists have used high-speed imaging at the mesoscale - from 100 microns to 1 mm. It suddenly turned out that tiny bumps in a piece of steel form vortex-like structures, which then turn into small cracks. This was most evident when the piece of steel was at an acute angle to the piece of copper.

The results were unexpected because the experiment was carried out at room temperature, and under such conditions friction could not generate enough heat to soften the metal. However, scientists have seen phenomena usually associated with liquids rather than solids.

It was known that small pieces of metal were removed from the friction surface. It is generally believed that this requires many cycles of friction, but the "liquid" properties of metals can lead to the rapid formation of microcracks and greatly accelerate the wear of the part. Therefore, in the manufacture of numerous mechanical parts, from bearings to pistons in engines, this phenomenon must be taken into account.

Scientists believe that the "liquid" properties of metals are directly related to the size of the grain - the tiny crystalline "bricks" that make up the metal.

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