00:00If what you're about to see had been shown in physics classes, the world might have turned out very differently.
00:06Because then we would have known since childhood how fascinating the world is and what amazing phenomena can be observed
00:12and studied in it.
00:13So, let's be amazed.
00:16Lighting a candle through smoke.
00:17In these shots, it seems like the candle was lit through the smoke.
00:21How is that possible?
00:22In reality, it's the paraffin vapors that are ignited, which evaporate from the wick, so the candle lights up again.
00:28There are other interesting shots with the candle as well.
00:31For example, here's how a wick burns when twisted into a spiral.
00:35And the flame of a candle can also conduct electric current.
00:40And you can also create this kind of silver-coating illusion using a candle and an egg.
00:46Although eggs are capable of even more, they can withstand a shredder which can swallow anything, including entire machines.
00:54And here is the most visual demonstration of the Pythagorean theorem in the world.
00:58The sum of the squares of the legs is equal to the square of the hypotenuse.
01:02Show this Pythagorean demo to your geometry teacher.
01:05Let him appreciate it.
01:07And this is a demonstration of just two words.
01:10The speed of color.
01:11Researchers from the Swiss Federal Institute of Technology in Lausanne used a special camera in their experiment with a shutter
01:18that opens once every 3.8 nanoseconds.
01:22Which allowed filming at a speed of 24,000 frames per second account.
01:27Lasers were used and camera pulses opened the shutter to track the propagation of light.
01:33Ultra-fast filming makes it possible to see the movement of a light beam without moving the camera and without
01:39overlaying images from other cameras.
01:41And here are some more interesting shots where not only light but also electricity is involved.
01:47In northern India, four people hid under a tree from the rain and were all struck by lightning together.
01:52They survived but ended up in the hospital.
01:55A clear example for those who think it's a great idea to wait out a thunderstorm under a tree.
02:00And this is a great example of how knowledge of physics can be useful in real life.
02:05When engineers like this don't have a pole with a wheel at hand, they get bored and start making homemade
02:11toys.
02:12All they need for this is some wire, a battery, and a bit of imagination.
02:17Although there are quite a few designs like this, here's another option.
02:22Or you can make an electric motor for a bicycle yourself.
02:26And you can also run a million volts through the legendary Nokia 3310.
02:31And in this experiment, it not only survived but was also able to find a network and receive a call.
02:37Truly an indestructible device.
02:40Probably enthusiasts like that.
02:42If the neighbor's kids are making too much noise, tell them through the wall,
02:45I'm a little gnome living in the socket and I need to be fed two fresh nails.
02:49Or they work as electricians and install these tough Chelyabinsk LEDs that indicate a slight overload.
02:58By the way, this Nokia is so tough that people even used it instead of a brake pad.
03:04It's amazing, of course, that the asphalt wasn't damaged.
03:08All right, now seriously.
03:09Let's take a look at real levitation.
03:12Rub the straw and voila!
03:15Or here are some kitchen miracles available to everyone.
03:18They're related to a phenomenon called surface tension.
03:23And this Chinese guy is clearly doing something with the laws of physics.
03:27Although, to be fair, there are quite a few skilled people who can work with balance like this.
03:34And now it's time to fly.
03:36Back at the turn of the millennium, the first flights in wingsuits caught the public's attention
03:40and sparked a new wave of videos shot with GoPro cameras.
03:45Extreme sports enthusiasts quickly mastered this new way of moving
03:49and began to amaze audiences with their stunts,
03:52soaring between cliffs like giant flying squirrels.
03:54However, the devices were limited by gravity and had no other source of acceleration.
03:59For several years, stuntman Peter Salzman thought about how to expand the capabilities of the wingsuit.
04:05As a result of his collaboration with engineers from the BMW studio,
04:09a prototype was created with two chest-mounted electric ducted fans.
04:13They turned out to be relatively compact, but capable of delivering 25,000 revolutions, per minute in mute.
04:20The propellers provide a total power of only 20 horsepower for 5 minutes, but that's enough.
04:25A regular wingsuit loses about 1 meter of altitude for every 3 meters of horizontal distance,
04:30and the speed does not exceed 100 kilometers per hour, hour.
04:33But Salzman's project allows you to accelerate up to 300 kilometers per hour, hour and gain altitude,
04:38not just gradually descend.
04:39However, not everyone is so lucky when it comes to flying.
04:42Or on the contrary, some are much luckier.
04:44It depends on how you look at it.
04:46At a hot air balloon festival in Sinshu, Taiwan, a 3-year-old girl was carried away into the sky.
04:52The girl, who weighs about 13 kilograms, got tangled in the back of the kite.
04:57She tried to free herself, but the wind picked up and the kite suddenly took off.
05:01The girl was in the air for half a minute, after which the wind died down and she began to
05:06fall.
05:06The crowd of spectators caught the child.
05:09Local media report that the little girl was not injured.
05:12These shots are so shocking that you start to wonder if it's fake.
05:16Write in the comments what you think about this.
05:18Now let's move on to so-called spontaneous synchronization.
05:22And the secret behind the almost intelligent behavior of five metronomes lies not in the metronomes themselves,
05:29but in the platform on which they are placed.
05:31It can move slightly.
05:32The two cans at the bottom receive vibrations from the upper system and start vibrating themselves, sending the impulse back.
05:39The greatest impulse occurs when most of the pendulums tilt in the same direction.
05:43After that, positive feedback appears in the system.
05:46And the number of metronomes doesn't matter.
05:49Here, for example, there are 32 of them.
05:52In general, it's a clear illustration of what happens if you start rocking the boat.
05:57But let's move on to some hotter footage.
05:59Do you know how to touch 1500 degrees Celsius and not get burned?
06:04In this footage, you see the testing of thermal protection tiles for reusable space shuttles.
06:10When returning from space, the spacecraft rushes toward Earth at a speed of 27,360 km per hour,
06:16which causes the tiles to heat up to the melting point of steel.
06:20To prevent the spacecraft from burning up, this kind of thermal protection is installed.
06:24It gets extremely hot, but it doesn't transfer the heat.
06:28And finally, let's figure out this kind of levitation as well.
06:32What keeps a piece of metal from falling and makes it freeze in midair?
06:37The copper tube of the inductor is not a heating element, as you might think at first.
06:42It only serves as the core of the coil and directs the induced currents.
06:47The induced currents passing through the piece of metal not only keep it suspended,
06:51but also heat it up to a temperature of 1300 degrees Celsius.
06:56This temperature is high enough to melt iron, aluminum, or copper.
07:02Thus, this inductor allows you to melt metals right in the air, without any holders or refractory alloys.
07:09Such melting, without contact with the crucible, and without contaminating the sample with the crucible material,
07:14makes it possible to obtain ultra-pure alloy samples.
07:18But this kind of levitation metallurgy is a special case of induction melting furnaces, which are now widely used.
07:24For example, they are used to harden all kinds of parts, such as gears.
07:29Moreover, in an induction furnace, not only surface hardening, but also deep, so-called through hardening, can be performed.
07:36For example, this is how a crankshaft is hardened, and this is induction heating and bending of tungsten rods.
07:49Let's wrap up here.
07:51We hope your understanding of physics is now deeper and more solid.
07:55Please give this episode a fair rating.
07:57See you in the next video on our channel.
08:03See you in the next video.
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