Physics thread

Isaiah Brooks
Isaiah Brooks

Back for more after a bit of a break.

Ask any physics question, I'll answer as best I can.

Other urls found in this thread:

m.mic.com/articles/19755/the-speed-of-gravity-why-einstein-was-wrong-and-newton-was-right#.boAq1CNs8

John Richardson
John Richardson

bump

Gavin Ramirez
Gavin Ramirez

What recursive universal function compels you to make these shitty attention whore threads?

Wyatt Thomas
Wyatt Thomas

My enlightened belief in my own intelligence and not some phony God.

Dylan Ward
Dylan Ward

Checked.

Lucas Russell
Lucas Russell

is meme magic quantum mechanics?

Easton Bell
Easton Bell

of courshe

Alexander King
Alexander King

welcome back physics fag

Are string theory and loop quantum gravity complete bull shit?
I'm trying to understand a quantum theory of gravity but it all seems like mathmagic and not realistic.

Lucas Walker
Lucas Walker

No. It's not really fair to say any mathematical theory of physics is bullshit unless it predicts wrong results.

Right now the problem is that experiment is lagging far behind theory (because theory is far more interesting IMO which is why I am studying it) so LQG and String theory prediction wont be tested for ages. In other words, our particle accelerators need to be hitting energies around the plank length.

Then again I know nothing about LQG except that it is based off gauging the Poincare group.

Cooper Allen
Cooper Allen

How can the radius of the universe be ~45 billion light years but the universe only be 13.8 billion years old? Does the speed of light change over the life of the universe?

Liam Hughes
Liam Hughes

Why do you say "as best I can" when you mean "as well as I can"?

Robert Jones
Robert Jones

I have a black hole that I found in the woods. How can I store it to stop it evaporating?

Jason Green
Jason Green

When the sea levels rise, why don't the continents float higher? What's the problem?

Oliver White
Oliver White

Why can't we see the future?

Adrian Wright
Adrian Wright

Locally nothing may exceed the speed of light, but globally it may.

Think of blowing a balloon up. Opposite sides move apart much faster than any two points locally.

This is the basis of the Alcubierre metric if I am not mistaken.

Another way of saying this is that you cannot compare directions at the North pole to those at the south pole because the tangent planes are different.

Bentley Cox
Bentley Cox

When the Soviet Union collapsed, we all said that Marxism is invalid.

When the wave function collapses, we all say that Quantum Mechanics is VALID.

What the fuck, dude?

Zachary Clark
Zachary Clark

because the future is unpredictable and constantly changing.

the continents float on magma not water.

magents

Andrew Gray
Andrew Gray

Why doesn't EVERYTHING stick to magnets?

Easton Robinson
Easton Robinson

marxism invalid

back to pol

Ayden Brooks
Ayden Brooks

because the future is unpredictable and constantly changing

This is really not an answer. Why can't I watch it changing? I will BE in it, after all, with these eyes and this brain. Why can I remember the past but not the future?

Daniel Morris
Daniel Morris

This is all to do with inflation. The weird thing is that the universe is quite homogenous at large scales even though no thermal equilibrium could have been established because no heat could have flown from one point to the other (they were out of causal connection).

Because I never majored in English.

Feed it your blood, Seymour!

Because continents float on top of the mantle and the seas are just pouring water into the lowest depths.

If you could, you could avoid the future happening and thus the future doesn't happen. Logic trapped.

Not everything has atoms with net current loops in one direction.

Colton Ross
Colton Ross

marxism not invalid
back to /leftypol/ :^)

Because memory requires a loss of entropy of the system and net gain of entropy of the surrounding.

If you were to remember the future it would require entropy to flow backwards.

If you want to know more about entropy just ask.

Justin Garcia
Justin Garcia

It would require my head system to GAIN entropy? That doesn't sound impossible!

Elijah Garcia
Elijah Garcia

No, it would require the same process to occur with the arrow of time reversed. But in fact the direction entropy increases is defined as the direction time flows. So memory of the future is a contradiction.

Gavin Hall
Gavin Hall

OP which field of Physics do you specialise in?

Ian Garcia
Ian Garcia

Its heading towards unification. I.e all the cool stuff but right now I am basically familiar with all aspects.

To get educated to the highest levels takes a very long time.

Luke Flores
Luke Flores

(checked)

the future only exists as probabilities. for the brain to see the future you'd have to see all the possible outcomes and in order of likelihood. the human brain isn't designed to process that much information.

because the speed of light as a limiting factor only exists mathematically and is constantly disproved in the real world.

Jack Rogers
Jack Rogers

because the speed of light as a limiting factor only exists mathematically and is constantly disproved in the real world.

It's actually one of the most proven things ever. Every single particle experiment confirms it. When the faux faster than light neutrinos came out, everyone was shocked and it got worldwide attention because of this.

Eli Harris
Eli Harris

Gravity is faster than light

Info can travel faster than light.

c only applies to particles that have been converted to energy.

Justin Johnson
Justin Johnson

no, and no. They travel at the speed of light.

Dominic Jenkins
Dominic Jenkins

Wrong and wrong

m.mic.com/articles/19755/the-speed-of-gravity-why-einstein-was-wrong-and-newton-was-right#.boAq1CNs8

Gravity is way faster than light.

And quantum entanglement allows for information to be communicated FTL

Hudson Thomas
Hudson Thomas

So somehow influence travelling at the speed of light would cause an increase in the potential energy of the Earth? Not buying it.

Especially since the classic gravitating elastic balls shows that gravitation propagating at the speed of light causes loss of energy (gravitational waves) while infinitely fast influences would have the balls bouncing against each other indefinitely.

Finite speed of propagation causes a two body system to coalesce not go further apart. Although I admit the Earth and sun is by no means a two body system.

There are plenty of binary objects that come together that we observe proving GR's predictions about gravity propagating at c. This was confirmed by our recent discovery of gravitational waves.

Also entanglement CANNOT be used to transmit FTL information. To teleport a state you require classical communication.

Brandon Ortiz
Brandon Ortiz

Cult of relativity apologist.

Science won't progress till that bs is finally abandoned.
It's the geocentric model of the modern age.

Nolan Lopez
Nolan Lopez

Maybe you are wrong and relativity is right?

Also science has progressed greatly since GR in the way of field theory. And in fact GR can be seen as the gauge theory of the Poincare group (as I indicated earlier) so fit in very snugly with modern physics.

Endeavor to learn QM and GR and then you can honestly challenge it.

Brandon Torres
Brandon Torres

does electricity move at the speed of light? As in shit like lightning bolts. Or does it vary depending on the situation (moves faster when surrounded by air vs water, etc)?

Ethan Scott
Ethan Scott

Endeavor to learn QM and GR

the more I learn the more they contradict each other.

how each describe time, the uncertainty principle ( Einstein sperged big time about it) and even the existence of gravitational singularities. non of these models fit together.

Brandon James
Brandon James

Think of electricity as a sound wave moving through a medium which is comprised of electrons.

Imagining this medium as a bunch of balls and springs, sound moves at a speed of sqrt(T/p) where T is the tension of the spring and p the density of the medium. Sound travels faster through more rigid media (ground vs air) and less dense (crust vs core of the Earth).

The difference with electrons is that the electrostatic force is long ranged. So the motion of one electron pushes them all around some amount (and is a 1/r^2 law but lets not worry). This is like having a VERY STIFF SPRING! And electrons are very light. Combined this means very fast waves.

So if you input a signal generator and pump in a wave and see how long to takes to go down a wire and come back, you will have a high fraction of the speed of light measured.

However each individual electron moves at a very small fraction due to being accelerated by a potential difference but losing energy to scattering. This is different to a medium where the particles are fixed in position but can vibrate a bit around this position, here the electrons can flow.

So to answer your question, the voltage (and E field) travels at the speed of light in medium, while the electrons travel much slower.

That's because QM is fundamentally non-relativistic. Learn some quantum field theory for a complete description of relativistic particle dynamics.

Also no-one knows about gravitational singularities well.

Chase Diaz
Chase Diaz

I guess I can put it this way:

In Newtonian dynamics position in 3N is a function of a universal time where N is the number of particles being described.

In QM the wavefunction is a function of 3N position and 1 time co-ordinate. This means particles are not described by points in space (delta functions) but by distribution.

In GR the position in 4N is a function of a proper time of the observer (so if I want to look at the dynamics of the particles I have to express the position of each one in 4space as a function of my time).

In QFT, the wavefunction is a function of 4N positions which are each a function of my proper time. This "function of a function" is called a functional.

I know it doesn't seem to make sense now and I sympathise. But it will eventually. It just takes fucking ages.

Luis Taylor
Luis Taylor

watch a video about QFT

particles are just vibrations of a field ? whats the field? how is it defined?

i get particles have a wave function and are in constant motion but how do all these fields fit together?
it would seem that particle interaction would constantly recreating new fields, how what would be creating destroying these fields and what are they made of?

Robert Lewis
Robert Lewis

It just takes fucking ages
Or it will come to you in an epiphany, a singularity in the thought process which strips away the static to reveal how it all adds up. Grasp that fleeting riff before it evaporates into the néant.
Op, what about the new particle from hadron? How exactly does a planet 30X the earth's mass but composed of metallic hydrogen stay in one piece? If it wasn't created locally, where?

Matthew Watson
Matthew Watson

particles are just vibrations of a field ? whats the field? how is it defined?

That's the heart of it. The mathematics is that there is a probability distribution smeared out in space but the interpretation is a lot more interesting.

It says effectively that throughout space there exist fields for each of the fundamental particles jiggling about in its ground state. Input enough energy and you can locally excite this field into something "real" called a particle. This explains why all electrons are identical: they are made from the same underlying field!

Pic related is the field operator for a Klein Gordon field you obtain when you quantize. The operator a annihilates a particle while a* creates so if you operate on the vaccuum you create a particle and give it a wavefunction e^1kx (i.s a plane wave, so give it a constant momentum).

This field operator makes up the Hamiltonian of a particle so it is easy to find how the wavefunction evolves with time.

Elijah Gray
Elijah Gray

I should add KG field describes a spin 0 boson (i.e the Higgs field).

There are many epiphanies that one must go through. I have had hundreds to get to where I am now. It really takes ages to understand all this shit.

As for the tetraquark, I am currently in the process of learning QCD so that I understand this stuff better. I don't think it's new physics necessarily but it is exotic.

I don't understand the metallic hydrogen. That just means hydrogen in a lattice which requires tremendous pressure so if the planet is super large, it could easily take that form.

Connor Martinez
Connor Martinez

so basically we've come back to the aether?
ie a medium through which light/particles travel. we just call it space time and field theory now.

Carson Wilson
Carson Wilson

Are you sure you didn't pull that one out of your ass? Because it's new to me and it still doesn't make sense.

You say that as I acquire memories, entropy LEAVES my head (that is, I make it more organised, presumably by adding memories to it).

But that's not a normal process. Normally entropy would INCREASE in my head - or anywhere else.

So, to remember the past, I have to cause the UN natural process to happen.

Why can't I remember the future, which requires only the natural INCREASE of entropy in my head?

Evan Reed
Evan Reed

the future only exists as probabilities.

How the hell do you know THAT?

I mean, given our lack of KNOWLEDGE about the future, we can express only probabilities about it, but that doesn't mean those possibilities exist OBJECTIVELY.

The future could be predetermined. No?

Dylan Reyes
Dylan Reyes

the speed of light as a limiting factor only exists mathematically and is constantly disproved in the real world

Well, THAT'S bull shit, for starters.

Owen Russell
Owen Russell

I kayak on the river.. Why is the current stronger on bends in the river?

Kevin Edwards
Kevin Edwards

One must admire your courage, standing up and pronouncing on topics that you don't understand.

Sebastian Phillips
Sebastian Phillips

quantum entanglement allows for information to be communicated FTL

There's a theorem proving you wrong. Unfortunately you will never be able to understand that theorem.

If you are CORRECT, then take your discovery to an investor and make your billions.

Adam Fisher
Adam Fisher

when will the jews just admit they are the offspring of satan himself ..and just come clean about all the shit they are causing in the world

John Jenkins
John Jenkins

All possible futures exist until the wave function collapses.

implying that isn't the norm on b/

Daniel Cooper
Daniel Cooper

This is a philosophical question of what the vacuum actually is. Is the vacuum a medium?

The point is the speed of light is constant for all observers while light travelling through a medium is relative to the medium. THis is very different behaviour so aether is not the right word to use.

These fields are underlying, they are excited producing particles but how these particles travel or through what is still the vacuum, not the aether (i.e creating a photon).

That's how I think about it. It's an interesting question about the direction of time.

There is nothing unnatural about entropy leaving your head as long as the entropy of the entire universe increases.

Think about you memories like computer memories. All binary. To store some memory requires flipping a few bits which takes work. The way I get this work is from applying an electric field to the bits. The bit aligns with the field doing work against the frictional forces that stop it turning hence releasing heat to the environment.

Now the energy has left the bit which is now in a more aligned state. The entropy of the bit is lower but the entropy of the universe is greater.

Much more fucked up is photosynthesis. It still feels like violating the 2nd to me.

Chase Kelly
Chase Kelly

All possible futures exist until the wave function collapses.

That's a tautology.

If you admit that the future is predetermined, then the wave function doesn't NEED to collapse. All of the multiple-universe bullshit goes out the window.

Hunter Carter
Hunter Carter

Are the bends narrower/less shallow? Also if you go closer to the outer bend of course it will be faster, the water must go a larger distance in the same time as the inner bend.

Incompressible viscous flow and continuity are your friends! :)

>

3

Also interpretations of QM can be argued about until the end of time. The essential physics remains the same.

Charles Williams
Charles Williams

Except the wave function has to collapse

Start of a sports season , every team has a chance to win. Therefore all teams are the champs in degree of probabilities.
But the season ends and all but one possibility are eliminated.
the only way for the future to be determined is for the future to become the present.

Nathaniel Evans
Nathaniel Evans

Who's gonna step in as a late replacement against DC at UFC 200?

Nathan Jackson
Nathan Jackson

Start of a sports season , every team has a chance to win.

I ask whether the future could be predetermined, and you respond with a scenario where the future isn't predetermined.

That proves nothing.

Jeremiah Nguyen
Jeremiah Nguyen

Well on a macro scale the future is determined. I.e. The sun will burn out in 4.5 billion years. Our galaxy will collide with andromeda in 2.5 billion years.

It all depends on the forces controlling the system. Gravity is predictable. Quantum forces aren't.

William Garcia
William Garcia

shut up

Benjamin Sanders
Benjamin Sanders

Fuck off cuck faggot.

Grayson Turner
Grayson Turner

shut the fuck up bitch

Aiden White
Aiden White

Make me!
I'll tell me mum on you, faggot.

John Turner
John Turner

show her this site
i dare you
faggit

Nathaniel Long
Nathaniel Long

I wanted to ask you about something but is your physics pure or heretical (metaphysical cosmoshit)

still believing in kike's theory of relativity
space or universe is the biggest meme, you Globalist Goyim. sit down.

Metaphysishit- just born out of useless theories made-up by paganist albert kikestein.
math equation doesn't fit
challenge accepted cringey 9gag meme.jpeg
made up solution so that it fits the answer
iamcorrect.docx
^^ basically metaphysics in a nutshell
Even Tesla denounced einstein for that shit theory.

What happened after the ""relativity"" theory?
""NASA""
cosmos and greek pagan naming convention for ""planets""
""gravity""
""Moon"" landing
Space bullshit
Blackhole
Buch of other "mathematic constants" (look it up) born out of nothing
lmao the earth and sun? we scientists discovered its parts, the crust, the core, the mantle, you name it! well we've never burrowed that deep enough though unless we had the equipment capable of withstanding boiling and molten (made up degrees C) but our theory truth is "globally" known therefore it's the truth.
also we know the components of mars or the gaseous jupiter just through looking at its color through telescopes and yeah, color although we never went there.
All these made up shit you swallow everyday. -brown pill at its finest.

We're living a lie and it's now called as Globalism tailored by followers and descendants of heretic masons of hundreds of BC that got BTFO in old testament.
It denies biblical truth incl. messiah's,
It perverts men into thinking there is no god but just bigbang bullshit,
It makes men atheists who deny intelligent creation while approving random probability/evolution, yeah just made up solution as I've said before.

Oliver Collins
Oliver Collins

Why did you decide against killing yourself?

Evan Barnes
Evan Barnes

New Dubay

Christian Powell
Christian Powell

Still here to answer questions

Alexander Green
Alexander Green

How the fuck could the universe quantum tunnel into existence?

Asher Williams
Asher Williams

Origin of water on Earth

John Perez
John Perez

bump

Jordan Morales
Jordan Morales

have to say thats kinda crazy to think about… speed of gravity. there is no way of being able to measure that. like a black hole, we have no way of being able to measure that…
pot thinking and mind blown :/

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