Tag Archives: physics

General Relativity Explained in 7 Levels of Difficulty

General Relativity Explained in 7 Levels of Difficulty



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This video covers the General theory of Relativity, developed by Albert Einstein, from basic simple levels (it’s gravity, curved space) through to the concepts of how curved spacetime is represented by psuedo-Riemannian manifolds with Lorentzian signature (that is, special relativity and minkowski space are the local tangent space), how matter and energy are represented by an energy-momentum tensor, and how these two together obey the Einstein Field Equations. The solutions to the Einstein Field Equations (including the schwarzschild metric, kerr metric, freedman-lemaitre-robertson-walker metric, etc) represent gravity around massive objects like the sun, earth, and black holes, but also the history and expansion and future evolution of the cosmos. The universe on a large scale is described by general relativity – on a small scale, quantum mechanics. And where they meet… there’s still work to be done.

REFERENCES
Wald’s textbook – General Relativity
Hartle’s textbook – Gravity: An Introduction to Einstein’s General Relativity

Carlo Rovelli History of Quantum Gravity:

Leon Rosenfeld 1930 paper on quantum gravity:

Kerr Metric Solution –
Schwarzschild Metric –

Eddington-Finkelstein Coordinates –

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These Planes Are Propelled With Ionic Thrust

These Planes Are Propelled With Ionic Thrust



In this video I show you how to create ionic thrust using electrodynamics to create air flow with no moving parts. I show you how ionic wind is produced in order to make ionocrafts and lifters fly. I also talk about ion thrusters used in space. I test if they work in a vacuum.

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What If a Blazar Entered Our Solar System?

What If a Blazar Entered Our Solar System?



This video is sponsored by Morning Brew. Get yourself up to speed on business, finance, and tech in just 5 minutes: Morning Brew newsletter has got you covered.

We’ve thrown a lot of disasters at Earth over the years: from asteroids and aliens, to the Sun’s death. But hey, the Universe is a dangerous place, and we’re not done yet. Now we’re going to throw a black hole into the mix, and not just any black hole, but a blazar. Black holes are usually found at the center of the galaxy. The Milky Way has a black hole that is four million times the mass of the Sun. But that’s small compared to other black holes out there. How old is the oldest blazar? Why can we see some blazars, but not others? What is the Doppler effect and how would it let us know that a blazar is on its way? What are active galactic nuclei? Do radiation and gamma rays from blazars affect the Earth? How far is Markarian 421 from us?

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What If is a mini-documentary web series that takes you on an epic journey through hypothetical worlds and possibilities. Join us on an imaginary adventure through time, space and chance while we (hopefully) boil down complex subjects in a fun and entertaining way.

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DraftScience vs Video #4: more re: Veritasium wind car

DraftScience vs Video #4: more re: Veritasium wind car



email: ds@donotgo.com
#VeritasiumContest
1/2 vmv
Was willfully created to Force reality to match religious daydreams. The history of its creation, defense, and eventual acceptance is a mockery of the scientific method. Truth was forsaken for agenda, evidence was exaggerated distorted and quote mined to support a plainly silly notion of reality…

“”If I’m in space and I throw a 2 L bottle of coke (2 kg) away from me at 1mph., do I received the same thrust if I shoot a dime (2 grams) away from me at 1000mph.? If so isn’t this proof against the kinetic energy formula?””

“”Is there any physical evidence defending the kinetic energy theorem? The theory says an 8 lb bowling ball will produce twice as much “energy” as a 16 pound ball thrown with the same effort. No pro bowler can make A lighter ball work. Why? “”

“”If I shoot two objects with inverse velocity to Mass ratios (for exp. 10m 5v vs 5m 10v) into gravity your formula says one object will have twice as much energy as the other at liftoff. If I let the objects fall, on an identical spring they will be recorded to impose the same pressure, the same joules of energy. How do you reconcile that fact with your theory? or Do you dispute the fact?””

“”Your theory says a 5-ton train going 10 miles an hour has twice as much energy–ability to do work as a 10 ton going 5 miles an hour. I claim you will never prove that to be true, and that if you actually collected the energy of the moving objects in a scientifically sensible manor it will be clearly demonstrated that they have the same capacity to do work.

Do you think a 5-ton 10 miles an hour train can do twice as much work has a 10 ton train going 5 miles an hour? Do you think you can create heat or deformation and transfer 100% of your momentum to another object?

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The Missing Pieces of Quantum Mechanics, TEMPORARY

The Missing Pieces of Quantum Mechanics, TEMPORARY



The audio of this one has been fixed (mono to stereo, normalized).

This video is TEMPORARY (expected deletion date, Sunday, May 23). Why? At time 37:45, I showed a video to try and explain the Schrödinger’s cat puzzle. That was HUGE fun. I realized though that I really need a second video that shows at 5 different moments of space-time what the wave function is EXPLICITLY. It will not be too hard to do, but I think it will add considerably to the presentation, at least it has for me even in the draft form. This also puts pressure on me to make said SHORT video.

The fourth video in the Spiritual Physics Research Discussion Series talking
about the missing pieces needed to understand quantum mechanics. Rev. Lara Hoke kindly provided a spiritual frame for the evening. Doug Sweetser presented for a general audience the core ideas behind relativity in physics. After presenting enough slides to explain this newly designed t-shirt in about a 50 minutes, the zoom room was opened up for discussion and open-ended questions
(not included).

The Simple Math Rule remains in effect for all slides, with no math
expressions more complicated than a square (one number times itself).

site:
slides:
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2011 Minute Physics video on Schrödinger’s cat.

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What If You Traveled One Billion Years Into the Future?

What If You Traveled One Billion Years Into the Future?



If you traveled 10,000 years into the future, what would planet Earth look like? Would most of its surface be covered in volcanoes? Or would it be frozen in ice? What if you traveled even further, to one million years in the future? Would all of the oceans have evaporated? Or would it have become one giant water world? Now, what about one billion years? Would there be any humans left? Or would they have settled in other parts of the galaxy?

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What If is a mini-documentary web series that takes you on an epic journey through hypothetical worlds and possibilities. Join us on an imaginary adventure through time, space and chance while we (hopefully) boil down complex subjects in a fun and entertaining way.

Produced with love by Underknown in Toronto:

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What makes things shiny?

What makes things shiny?



Why exactly are some things shiny? 

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To find out more:

Richard Feynman’s book on Quantum Electrodynamics:

Website discussing why metals are shiny:

Image credits:

Reflection image: Lasse Havelund / CC BY-SA ( – filter applied

Keywords:
Science, ASK., Metals, Mirror, Understanding, Technology, Physics, Light, Refraction, Snell’s Law, Vsauce, Veritasium, Mark Rober, Minute Physics, Shiny, Reflective, Why, SciShow, science, Hank, Green, education, learn, light, color, metal, shine, neutrons, protons

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Understanding Quantum Mechanics #8: The Tunnel Effect

Understanding Quantum Mechanics #8: The Tunnel Effect



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Sound: zapsplat.com

0:00 Intro
0:35 Quantum Mechanics Recap
2:07 Free particle, classical vs quantum
3:22 Tunneling, classical vs quantum
6:32 The weird part
8:20 Sponsor Message

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Why don't round lenses produce round images?

Why don't round lenses produce round images?



Why do cameras make square or rectangular photos?

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To find out more:

Chromatic aberration –

How cameras work –

A quick video showing you how the mirror flip in an old SLR camera happens –

Photo credits:

Chromatic aberration flower – EricFrederich
Creative Commons Attribution-ShareAlike 3.0

Absorption spectrum of a few elements

Almuazi / CC BY-SA (

Sellmeier equation – Maksim

Creative Commons Attribution-Share Alike 3.0

Cheetah – Joshua Burke

Creative Commons Attribution-ShareAlike 3.0

Keywords:
Science, ASK., Camera, Photograph, Understanding, Technology, Physics, Light, Refraction, Snell’s Law, Vsauce, Veritasium, Mark Rober, Minute Physics, Chromatic Aberration

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How to make light work technology generator #technology river technology #Shorts #bindasmedia #short

How to make light work technology generator #technology river technology #Shorts #bindasmedia #short



@BINDAS MEDIA @bindass @Bindas Fun @Bindass Khabray @BINDAS FILMS @Bindas Fun Masti @Primitive Technology @Technology Gyan @Primitive Technology Idea @Primitive Technology KH
#shorts #bindasmedia #status #birds #parrot #whatsapp #physics #status @Physics Wallah – Alakh Pandey @minutephysics #sirajsir

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