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GetAClass - Physics
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Registrace 12. 09. 2021
School physics: experience and experiments
Physics is an experimental science. Physicists have extracted all their knowledge from experience, asking questions to nature through such experiments that make it reveal its secrets. In a school, likewise, physics is simpler to understand if each lesson begins with practice, and knowledge is acquired through experiments prior to textbooks. And even in books we can better grasp things that we made and seen by ourselves.
The present video course is an encyclopedia of elementary physics for school students. Watch how we do experiments, do it with us, come up and show new ones! Listen to our reasoning, sort it out, make your own explanations and estimations. That's the best way to investigate how physics works.
Physics is an experimental science. Physicists have extracted all their knowledge from experience, asking questions to nature through such experiments that make it reveal its secrets. In a school, likewise, physics is simpler to understand if each lesson begins with practice, and knowledge is acquired through experiments prior to textbooks. And even in books we can better grasp things that we made and seen by ourselves.
The present video course is an encyclopedia of elementary physics for school students. Watch how we do experiments, do it with us, come up and show new ones! Listen to our reasoning, sort it out, make your own explanations and estimations. That's the best way to investigate how physics works.
Temperature in focus
What is the maximum temperature that can be obtained using an optical system that collects the sun's rays into focus?
Keywords: solar furnace, the second principle of thermodynamics, Stefan-Boltzmann law, luminosity.
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airvoice.global
Airvoice produces comprehensive air quality monitoring networks and services for urban areas; digital twins and monitoring networks to forecast and manage air quality for industries; indoor air quality monitoring and management system for buildings.
dnair.in
DNAir brings to the Indian market unique air supply technology for clean and healthy indoor climate. Breathe Himalayan-like air even in Central Delhi.
Keywords: solar furnace, the second principle of thermodynamics, Stefan-Boltzmann law, luminosity.
Our partners:
airvoice.global
Airvoice produces comprehensive air quality monitoring networks and services for urban areas; digital twins and monitoring networks to forecast and manage air quality for industries; indoor air quality monitoring and management system for buildings.
dnair.in
DNAir brings to the Indian market unique air supply technology for clean and healthy indoor climate. Breathe Himalayan-like air even in Central Delhi.
zhlédnutí: 323
Video
Satellite temperature
zhlédnutí 288Před 2 dny
The satellite's temperature is determined by the balance between the absorbed radiation from the Sun and the satellite's own thermal radiation. This temperature can be controlled by changing the absorption capacity of different surfaces of the satellite. Our partners: airvoice.global Airvoice produces comprehensive air quality monitoring networks and services for urban areas; digital twins and ...
Crookes radiometer
zhlédnutí 287Před 14 dny
A Crookes radiometer is a glass cylinder with evacuated air, inside of which there is an impeller, the blades of which are mirrored on one side and blackened on the other. Under the influence of light or infrared radiation, this impeller begins to rotate with the mirror side of the blades forward. We're looking into why this happens. Our partners: airvoice.global Airvoice produces comprehensive...
Mean free path
zhlédnutí 461Před 21 dnem
The rate of the transfer process in gases, in particular diffusion, depends on the free path of the molecules. The video discusses a simple way to estimate this value. Keywords: thermal motion of molecules, molecular kinetic theory, scattering cross section, diffusion. Our partners: airvoice.global Airvoice produces comprehensive air quality monitoring networks and services for urban areas; dig...
Hand helicopter
zhlédnutí 449Před měsícem
The hand helicopter is a toy consisting of a propeller and a stick. When launched, it flies up several meters. Surprisingly, the propeller thrust during such a launch remains almost constant, although its rotation speed decreases several times. This is due to the adjustment of the angle of attack to compensate for the reduction in rotation speed. Key words: air propeller, angle of attack, aerod...
Optics of mirror
zhlédnutí 304Před měsícem
The video examines the path of rays and the construction of images in concave and convex parabolic mirrors. Our partners: airvoice.global Airvoice produces comprehensive air quality monitoring networks and services for urban areas; digital twins and monitoring networks to forecast and manage air quality for industries; indoor air quality monitoring and management system for buildings. dnair.in ...
Illumination
zhlédnutí 303Před měsícem
Illumination is the light energy incident on a unit surface area per unit time. What is luminous intensity and luminous flux? We deal with this in our video. Our partners: airvoice.global Airvoice produces comprehensive air quality monitoring networks and services for urban areas; digital twins and monitoring networks to forecast and manage air quality for industries; indoor air quality monitor...
Why is it hot in summer and cold in winter?
zhlédnutí 322Před měsícem
Why is it hot in summer and cold in winter?
Geometrical secrets of Islamic pattern
zhlédnutí 1,1KPřed 4 měsíci
Geometrical secrets of Islamic pattern
thank you
Ничего себе! Как хорошо вы владеете английским!
I understand it in the pipe and also the first example with the two balls, but i dont get it with the ball + vacumm, nor the ball + water. Can someone try to explain it to me? thanks
Then how come when I make the hose exit narrower the water shoots further and has more force
Bernoulli explained this a long time ago. If an incompressible fluid flows out, then the flow velocity and pressure are related by the relation: p+ro*v^2/2 = const (constant) The conclusion is simple: the more the hose is pinched, the farther the jet flies.
Literally how a water pump works
Love the British accent!
My brain is twisting in Confusion
By slowly pressing a box internal pressure would rise and the walls of box would heat up. Box would remain pressed in position that force heat of walls and heat of walls would be collected for electric energy production or for heating , keeping the box in pressed position would be done whit some closed brackets so no input of energy for keeping the box pressed so all its heat would be used to produce output of energy
Mam made a video of Bernoulli 's law but there was Newton😂 in te starting
Great explanation 👍🏼
Poleshift. The moon pulls on earth. So expect crazy events
Everything reminds me of her
Nice explanation. But.... Swiss? Daniel was born in the Netherlands, famous university city of Groningen.
The plate on the left is polished - SOME POLISH !
1st view , 1st comment
Why do we see the moment of stability between the flipping of rotation axis? What makes it at one time stable and a second after "unstable"? And why do we see this pause under microgravity conditions? I think that our understanding of gravity is incomplete. We fail to describe the interaction between the gravity forces of a body and its rotation - with regards to other bodies. I believe the relation between gravity forces and rotation are very similar to those between magnetic forces and electricity. Just as movement or rotation of a magnetic body generates electric current within a nearby object, known as Eddy currents, which, in turn, create forces which work against the rotation or movement of the magnetic body, I believe that gravity and rotation behave just like this: the rotation of a heavy body generates a gravitational field which, in interaction with a close and heavier body (the spaceship) generates a force which works on the edges with less momentum of the body, causing them to start rotating in a surface vertical to that of the main rotation. I believe that gravity force generates rotation of the bodies, and that the rotation decreases the impact of gravity; much like electrostatic tension pulls negatively charged bodies closer, thus decreasing the tension.
I am commerce student 😅
great thanks.
This is the same way a car carburetor works.
what if it done on space
I miss her so much 😭
Beautiful work. What software was used to track the trajectory and indicate the number of turns and height superimposed in the video?
Someone tell Elon he needs to launch satellites use this.
Man speaks with the sentence structure of Bible verses. Very impressive
Great explanation! The cup is 10 cm tall (0.1 meters) and the molecule's mean free path is 0.1 microns (0.1 × 10^-6 meters). Number of Collisions: Molecule makes ~1,000,000 collisions on average before escaping. Distance Covered: It covers approx. 0.1 meters (10 cm) in total distance. Thanks for the clear breakdown! hope those were hiccups, stay healthy.
This video is still WRONG. Please make corrections or remove it. .. The statements about Bernoulli's Principle are correct, but the demonstrations are very poor. The balls, spoon and funnel are a result of the Coanda effect. . The tube inserted into the wall of the neck is protruding into the flow (seen at time 2:57) This causes the air to curve around the end and sides of the tube. This curved flow is the cause of the lowered pressure. This will work with no pipe around it; just the air blowing across the vertical tube. .. To correctly measure the static pressure inside your narrow neck, the end of hat tube MUST be flush with the inside surface. .. At time 4:51 we see that the two pressure sensing tubes appear to be more like flush, but it is difficult to see clearly. For that to truly sense the static pressures, there must be NOTHING protruding into and disturbing the flow. . . . . This shows the proper way to measure static pressure within a flow: Weltner Direct link: still valid on June 24 224: “Misinterpretations of Bernoulli's Law by Klaus Weltner, University of Frankfurt (G)” FIG 3 Static Probe: www.prirodopolis.hr/Bernoulli-Coanda%20Demo_files/Misinterpretations%20of%20Bernoullis%20Law.pdf
ну вот, теперь можно узнавать физику и практиковать английский одновременно 🧐
Left side cup may not move due to friction of edge touch it
i really liked the visual examples in this video, i wish the teachers did that. tysm!!
Learn with us!))
But isn't it more like the pressure of the fluid of the restricted section increases, while the pressure exerted by the fluid on its containment decreases? If you observe this principle in water coming out of a pressure washer, then the smaller and tighter stream exerts more force on any object it encounters. The pressure within the restricted stream of water is higher and it creates a low pressure boundary of air surrounding it.
No, Chris. Your simplified thinking has led you astray. . As the fluid flows TOWARD the inward sloping wall sections, the flow is TOWARD those walls and, therefore pushing more on them. It is similar to a wind that pushes more as it tries to approach a surface or blow you down. . Then, a fundamental fact of fluids is that pressure at any given point pushes outward in ALL directions. . That pressure against the wall is also eithin the fluid and it 'communicates' both inward and backwards, upstream and increases the pressure in the FAT section on the left. >>The reduction in diameter CAUSES the UP-STREAM pressure to increase.!.<< . Now, think of the narrow section as an outlet of a pressurized tank. The higher pressure in the fat section accelerates the fluid into the narrow section. This is Newton's force causing acceleration of mass. . It is a fact that for fluid to accelerate, there must be a pressure difference between two locations {called a pressure gradient} and the higher pressure pushes more, thus accelerating air in between, toward the lower pressure. . It is identical to a brick with TWO opposing forces on it. If one of those opposing forces is larger, the NET force is toward the lesser force and the brick accelerates toward the lesser force. . Fluids are the same.!. . . . . . The "pressure" of the pressure washer is caused by the INERTIA of that very fast stream of water, SLAMMING into the surface!. It is no different than if I run into you. My Mass has inertia that slams into you. . That is called "Stagnation Pressure" because the flow stops at the surface and is stagnant against the surface . At that point, all the kinetic energy in that mass-low, gets converted to pressure at the surface. This is CAUSED by AIR'S INERTIA.!. . {{By the way, the very same thing happens if the surface 'slams' into stationary air. The Air's Inertia resists being accelerated by the moving surface and that causes a pressure increase at the surface that is also within the air. That is the same as me running into you and YOUR mass / Inertia resists my push and your inertias is causing that increase in pressure on you. SAME PHYSICS. . HOWEVER, When I am running, I exert NO extra pressure on things I pass by and a jet of water or air is the same. . The pressure INSIDE that jet is called "Static Pressure". That is the pressure you would measure if you were inside it AND traveling along with it. That is called it's "Static Pressure". . . . A "FAST" stream of air, or water, exiting a hose is at the SAME internal, static pressure as the stationary atmosphere around it, no matter what some really dumb PhDs say in their misleading You Tube videos.!. . We measure this daily in the aerodynamics industry. <-- ABSOLUTELY TRUE!! . To see how to CORRECTLY measure the internal, static pressure of moving air, See Weltner's paper describing the industry standard static pressure probe, link below. . That water out of the pressure washer has the SAME static pressure as the stationary atmosphere around it! The higher pressure inside the hose is what pushes / accelerates it out into the now RELATIVLY lower atmospheric pressure. Weltner Direct link:June 24 224: “Misinterpretations of Bernoulli's Law by Klaus Weltner, University of Frankfurt (G)” FIG 3 Static Probe: www.prirodopolis.hr/Bernoulli-Coanda%20Demo_files/Misinterpretations%20of%20Bernoullis%20Law.pdf . I simply cannot understand why this simple physics illudes so many supposedly intelligent folks. . . . .
czcams.com/video/BDexuYCJ4DY/video.html
это ии или вы действительно так хорошо говорите по английски?
ИИ
Jis
I hope you don't have children.
The person blowing into the pipe is so silly bean lol
Why is there in 7:16 omega^2 ? Shouldnt be there just omega?
WATCHED.✔
Like.podpiska!
The first comment ❤ ! Awesome video 😊
She made an airbrush.
It's just gyroscopic stabilization that temporarily destabilizes and then re-stabilizes.
Awesome
The acsent is very funny. Wauderr😂
This is called.... போற pokula valichitu poiduradhu ❤
How Romans got water up hills
Great explanations and simple experiments to show. Congrats. Convex mirror for cars : is it in order to enlarge the visual field?
Thanku❤
Training my model with this (and reddit /j)
We do not have presently, however and nevertheless
Literally could have simplify the whole video by just saying it's pressure guys