All with friday! We have accumulated a second selection of various amazing videos. If you missed the first, we recommend you read . Today, we have, basically, a video about these or other manifestations of physical strength and properties. And, of course, science and technology also did not remain deprived.

High-speed shooting of a ball and racket collision for table tennis. The ball has a supersonic speed

We do not know about you, but we were stunned twice. The first time when the ball (ping-pong ball!) Struck the racket, the second time - when he broke it to hell at all. And this despite the insignificant mass.

How does a shot from a Kalashnikov submachine gun look like under water

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Surprisingly beautiful and unusual shape. Pay attention to the distance traveled by the bullet, and its behavior in the final stage. So if you happen to see the Indian fighter (which is in itself a small tragedy), where the main character will shoot under water and mow down crowds of enemies, then do not believe it. Although Bollywood removes such masterpieces that some kind of underwater shooting looks like a pale mole against their bright background.

At the same time, here is a selection of high-speed shots of underwater shots with ammunition with various bullets, also a very curious sight. You can start watching from 1 minute:

Sand and sound vibrations

Fascinating spectacle of how sand is distributed over a metal surface. Everything is very simple, but rarely you can find such a visual confirmation of certain physical phenomena. If we were to drive such a stand into a sound-proof box with a transparent lid, there would be an extremely original cymatical coffee table. It is a pity not to hang on the wall.

Nebraska sky

Timelaps video of cloud cover over the city of Lincoln, Nebraska. Even seeing pieces of buildings, it’s hard to believe that these are “only” clouds.

Visual magic of geometry

The author of these seemingly simple geometric structures, in his childhood, he was probably a fan of cubes. Although, one of us was not ... The boy grew up as an uncle and masterfully put science at the service of his hobby. Very competent approach, we respect.

Light barrier

A very unusual art installation that uses artificial smoke and a matrix of dozens of round convex mirrors on servo drives to create a three-dimensional, three-dimensional image. A small source of light is directed at each mirror. Reflected rays are focused in different parts of space, creating a glow due to reflection from smoke particles.

Hummingbird Aerodynamics

According to the results of high-speed video (1000 frames / sec), scientists have created a model of created turbulence during the flight of a hummingbird. This bird flaps its wings like an insect, making about 40 strokes per second (!). At the same time, the hummingbird is kept in the air by no means due to the Bernoulli equation, unlike airplanes and other birds. Instead, nectar-eaters with insane speed "sweep" the air forward and down. This experiment confirmed the assumption that about 75% of the hummingbird's lift force is formed while the wings are moving forward, and only the remaining quarter falls on the movements of the wings backwards. However, it still remains a mystery how a hummingbird manages to hang in the air and make three-dimensional evolution in space.

The most realistic wave generator

At the University of Edinburgh, a round pool with a diameter of about 25 m was installed, in which elements swinging around the perimeter create waves of almost any configuration. As an example of the capabilities of this installation, you can look at the Japanese version, which is much more modest in size:





I wonder what it is like to swim in it on an inflatable mattress, when such a splash arises under you.

Rival sculptors

It was only a matter of time - the emergence of machines for the manufacture of three-dimensional parts of stone. With metal work wonders, and the stone is worse? It seems that soon any talented 3D modeler with access to such a machine will be able to contend with the sculptors. It remains to come up with a robot that will paint masterpieces in oil using a picture from Paint.

And the bullets are flying, bullets

Absolutely fascinating sight. High-speed (1 million frames / sec) shooting of collisions of different bullets with obstacles. And all this happens in an incredibly short amount of time!