Trained dog. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Trained dog. Focus Secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

Fold up the paper square. Fold the paper from corner to corner, and then unfold it. Connect the opposite corners at the point of the center line. Fold in the top corner to make a triangle. Bend the resulting two outer corners inward, to the junction of the other two corners, to get the shape of a kite.

Focus Trained dog

Next, fold the top corner inward to form a triangle. Fold the two outer corners inward to get the kite shape again. Fold the paper in half into a dog shape. Color the dog.

Focus Trained dog

Showing the trick, tightly fold the "dog" and put it on the table. Wait a few seconds, then command: "Serve!" And she jumps up on her hind legs. (You will need a little practice before the show in order to give the command in time. If the doggie jumps up too quickly, fold it tighter. If it is too slow, press the inner folds closer together.)

Focus Trained dog

Focus secret:

After you've done all the folds, most of the paper is in the middle, a little ahead of the center of rotation, but just a little. When the "pawl" opens, the center of gravity moves closer to the table surface not in a straight line, but in an arc, and as a result shifts slightly back. At the same time, the center of rotation also shifts not in a straight line, but in an arc, and also somewhat forward. As a result of these two small displacements, the center of gravity is behind the axis of rotation and the dog jumps up.

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Forest of white pipes 26.02.2010

Michigan scientists have grown nanotubes from boron nitride. White boron nitride nanotubes differ from the more well-known black carbon nanotubes not only in color, but also in properties. For example, heating up to 1100 ° C is beyond their control.

The electrical properties of nitride tubes are also good, with the help of doping they can easily be turned into a semiconductor and used for power electronics. Their hydrophobicity is also very high - a coating of such nanotubes will have a lotus effect, and if it is applied to glass, it will retain transparency. However, it is not easy to obtain tubes from boron nitride: they grow unstable, and the components are poisonous, and the temperature is high, and they readily absorb impurities.

Scientists from the Michigan Technological University, led by Associate Professor Ek Kin Yap, coped with these problems and grew a forest of more or less identical boron nitride nanotubes on a substrate. The mechanism of their growth is similar to carbon ones, that is, one cannot do without a catalyst - in the experiment of Ek Kin Yap it was magnesium oxide with iron and nickel. Since nanotubes only grow where there is a catalyst, many different patterns can be created from them.

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