The needle and the magnetic poles

Published May 02, 2017

The needle and the magnetic poles

What happens if a thin needle enters between the poles of a horseshoe magnet? If you do not have a needle, you can take a thin and light knitting needle or any other lightweight elongated steel object. The needle would stand vertically. The magnetic field lines pass through the needle, it is magnetized...

Sound

Published May 02, 2017

Sound

We know from observations and experiments that sound - it swings. Sound propagates in a well-solids, slowly - in liquid, even more slowly - in gases. The oscillation frequency is measured in hertz is the reciprocal of the period. So, if the air vibrations occur with a frequency of 16 to 20,000 Hz, it is perceived as sound...

Dew

Published May 02, 2017

Dew

Early in the morning, before the sun had not yet risen high in the clear sky, the dew shimmering rainbow colors. Do not miss an opportunity to enjoy this beautiful game of multi-colored rays. Many people mistakenly think that the dew drops falling from the sky like rain. In fact, the dew does not fall, and slowly sits down on cold objects, standing out from the air...

Shadows

Published May 02, 2017

Shadows

The interesting shadows cast by objects when the sun shines? With shadows, above all, very easy to determine the height of a tree standing alone. Stuck vertically into the ground pole, measure the height and the length of its shadow, and the length of the shadow cast by a tree. It remains to calculate the rule: how many times longer than the shadow of a tree shadow of the pole, so many times above the tree pole...

Noise

Published May 02, 2017

Noise

Listen to the noise of the forest: you distinguish the rustle of leaves, the sighs of the pine forest, muffled murmur of the oak grove. The rustle is heard only in the deciduous forest of leaves in the wind rub against each other, creating a forest noise. Noise is a chaotic oscillations of different physical nature, are complex temporal and spectral structure...

Entropy

Published May 02, 2017

Entropy

Entropy is a certain magnitude, the increase in which irreversible processes (eg, in the conversion of mechanical energy into heat) represents the portion of body energy, which can no longer perform useful work and dissipates in the environment as heat. Entropy is widely used in the natural and exact sciences, the term...

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