The simplest submarine. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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The simplest submarine. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

After experiences with eggs in salt water и с vegetable oil bowl, this submarine experience will seem easy.

Cut out a model of a submarine from wood, only 5-6 cm long. The body is elongated, like a cigar, and slightly squeezed from the sides. There is a cabin in the middle... Done? Drop it on the water, in a glass jar.

The only bad thing is that the boat does not sink, but calmly floats on the surface, as if forgetting that it is not a simple boat, but an underwater one.

Well, nothing, now we will remind her. Take a few short carnations with a large hat (the so-called wallpaper) and drive them in a chain along the bottom of the boat. Now she sits in the water much deeper, and besides, she does not fall on her side. Distribute the carnations so that the boat, as the submariners say, "stands on an even keel", that is, it does not peck either bow or stern.

Now we need to add a small load with everything so that the boat is completely submerged. Wrap it with thin copper wire, preferably bare or in enamel insulation. The boat will sink, go to the bottom.

The simplest submarine

Gradually winding the wire and cutting it off piece by piece, make sure that the boat "hangs" between the bottom and the surface of the water. Now she's really underwater!

Author: Galpershtein L.Ya.

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According to a new study by scientists in the US and China, prolonged exposure to polluted air affects human cognitive performance.

To investigate the link between air pollution and cognition, the researchers turned to the results of the China Family Panel Studies, an annual test of Chinese citizens that includes verbal and mathematical tests of cognitive performance. The scientists especially focused on the results obtained from 2010 to 2014 in 162 randomly selected Chinese regions. In total, about 20 people participated in the study in this way.

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