Video post: supersonic tennis ball, Kalashnikov assault rifle and hummingbird

    All with Friday! We have accumulated a second selection of various amazing videos. If you missed the first, we recommend that you familiarize yourself . Today, we basically picked up a video about various manifestations of physical forces and properties. And, of course, science and technology also did not remain deprived.

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

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

    What does a Kalashnikov assault rifle look like under water

    Amazingly beautiful and unusual in shape track. Pay attention to the distance traveled by the bullet, and its behavior at the final stage. So if you happen to see an Indian action movie (which in itself is a small tragedy), where the main character will shoot under water and mow down crowds of enemies, then do not believe this. Although such masterpieces are filmed in Bollywood 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 shooting of underwater shots with ammunition with various bullets, also a very interesting sight. You can start watching from 1 minute:

    Sand and sound vibrations

    A bewitching sight as sand is distributed over a metal surface. Everything is very simple, but it is rarely possible to find such a vivid confirmation of certain physical phenomena. If you would still drive such a stand into a soundproof box with a transparent lid, there would be an extremely original cymatic coffee table. Sorry, do not hang on the wall.

    Sky over nebraska

    Timelapse video of a cloud cover over Lincoln, Nebraska. Even seeing pieces of buildings, one cannot believe at all that these are “just” clouds.

    Visual magic of geometry

    The author of these seemingly simple geometric designs, as a child, was probably a fan of cubes. Although, one of us was not him ... The boy grew up in an uncle and skillfully put science at the service of his passion. Very competent approach, respect.

    Light barrier

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

    Hummingbird wing aerodynamics

    Based on the results of high-speed video shooting (1000 frames / sec), scientists created a model of the created turbulence during a hummingbird flight. This bird flaps its wings like an insect, making about 40 flaps per second (!). At the same time, the hummingbird does not stay in the air at all thanks to the Bernoulli equation, in contrast to airplanes and other birds. Instead, the nectar-eaters at an insane speed “sweep” the air forward and down. This experiment confirmed the assumption that about 75% of the hummingbird's lifting force is formed during the forward movement of the wings, and only the remaining quarter accounts for the movement of the wings backward. However, it still remains a mystery how hummingbirds manage to hang in the air and make three-dimensional evolution in space.

    The most realistic wave generator

    At the University of Edinburgh, they installed a round pool with a diameter of about 25 m, in which elements swaying 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 air mattress, when such a splash occurs under you.

    Sculptor Competitor

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

    And the bullets fly, the bullets

    Absolutely bewitching sight. Ultra-fast (1 million frames / sec) shooting collisions of different bullets with obstacles. And after all, all this happens in an incredibly short period of time!

    Also popular now: