Ask a 4th year physics major almost anything. Ill try my best

Ask a 4th year physics major almost anything. Ill try my best.

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80's nuclear fission powered concept cars.
Good idea?

Please explain spin to me.
I've never really understood what the property is in an intuitive way.

If the big bang occurred (say) 13.8 billion years ago, then shouldn't the maximum distance away from our point of view be roughly 27.6 billion light years?

What exactly happens in quantum entanglement? Like, what's behind the scenes making it work?

Hypothetically, what would you see if you were travelling at the speed of light and then pointed a flashlight in front of you?

Are primordial black holes real or speculation - seems like they should be radiating away and leaving detectable evidence all over the place

No probably not, environmental factors aside (batteries) electric cars really are the best choice. If fusion reactors (fission nuclear ie bomb, fusion ie stars) ever got working we will have almost unlimited electricity.

Unfortunately spin is just hard to talk about. Richard Feynman has his belt trick you can look up. But i'll say this, spin is the amount of rotations needed to get back to the initial position. So an electron is a fermion (half integer spin) so it takes 720 degrees of rotation to return to the initial state. I myself have not gone much into spin, but that is my understanding.

This is a great question. Assuming the expansion of space was entirely linear, we might expect that. However, we can tell from observing light from distant type 1A super nova that the expansion of space has changed over time. Additionally, we need to consider inflation. Very early on in the universe, under a second after creation, the universe expanded at an extremely rapid rate. Then slowed to what we call Hubble expansion, which is ~70km/mpc/s. So in reality the observable universe is about 96 billion light years across.

The maths needed to understand this is tricky, you need a good handle on Dirac notation. But basically, say I have two coins and we some how entangle them. If I put each coin in their own box then check one and its heads, I know right away the other will be tails. As for how this actually works, I am sorry but I don't have a good way to translate the weird maths into words. The two objects each have probability distributions, that when you add them together you get 1. So if one is up the other must be down. Not a good answer I know.

As you increased you velocity, your field of view would increase, everything would become blue, as the light gets doppler shifted. As for the flashlight, it would not shoot light out in front of you. You are going at the same speed. But if you managed to go light speed, you would experience no time.

As far as we know they are speculation, a Nobel price is there for whoever can find one.

Do black holes store matter/light until they implode or is matter/light redistrubuted somewhere else like a wormhole?

The interiors of black holes really are a mystery to us. What I will say is its probably not a actual "singularity", that is most likely an artifact of the maths. Wormholes in black holes are also likley a math trick. What it actually looks like is anyone guess. In this regime size may not mean much at all, but I think it is some exotic matter in a strange warped space. So all matter/light just is stored in the center in its most broken down form.

Is there any way, in your opinion, to avoid time dilation while traveling at the speed of light?

Great fucking question. Answer is no one knows.

This was one of the most disappointing things to learn about. There are no ways around time dilation from near/light speed unfortunately. Warping space between you and your destination is perhaps a possibility, but that comes with paradox issues that no one has good answers for yet.

Interesting. What would be one of the paradoxes of warping space?

The theory is there are stars so far away from planet earth that we can't see/detect them because the light has not yet reached earth.

Have there been any cases where an astronomer looks in the sky one night and sees nothing, yet the next night looks at the same location and sees a star that was not seen the previous night because the light had not yet arrived? (IOW - has there been a case where an astronomer sees a star where none has been seen before because the light is only now reaching planet earth?)

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You begin to mess with cause and effect. It becomes possible for the effect to come before the cause. You could receive messages before they were even sent. So there might be some universal rule stopping any sort of FLT to protect causality violation.

Now you got me curious. Gonna find a documentary on a topic and get cozy.

I get what you are saying, but that is not exactly how that works. So yes our observable universe is expanding, as light has had more time to travel. However, the universe is also expanding, at some distance away from us, the universe is expanding faster than light away. Meaning there is a limit to what we can ever interact with and see. So has there ever been a case of some new thing coming into view? Not that I know of. Also remember, the further away we look in space the earlier in time we see the universe.

>But if you managed to go light speed, you would experience no time.
damn that makes my mind hurt

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Quick youtube search found this. youtube.com/watch?v=an0M-wcHw5A
There would be lots of it. Stay curious user.

Time is just now, you're talking about the measurement of the passage of time which is environmentally arbitrary

If the earth is spinning so fast why do we need planes? If it was really spinning that fast we could just jump and everytime we landed we'd have travelled like halfway across the earth.

so is it all a hologram ?

Dunno if you’ve seen the fields they use to make e car batteries, but if you did you’d switch right back to oil

you seem nice so listen to a old b tard: lurk a lot more. you’re gonna find your studies will directly contrast with what the world tells you, and this place can help if you know how to lurk. So learn how to. Once you hit your last 15-30 credits this might hit you hard if you’re a think outside the box kind of person. If not, look up lithium ion fields and lurk a little bit more newfriend. Good luck.

What are the implications of Wigner's friend paradox?

Next time you are on a train, drop something. From your POV it drops straight down. But, someone watching you drop the object who is standing next to the train will see it take a parabolic path.


Hahaha, the theoretical guys are going mental making that stuff.

>As for the flashlight, it would not shoot light out in front of you. You are going at the same speed.

This is wrong. Goto to grad school

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There is only so much oil in the world. One day it will all be gone. Need something to power the cars then.

Any fun job prospects out there? Asking for a friend ;-;

>environmentally arbitrary
What an excellent phrase. You are correct, we decided to measure time by rotations around our star. Intelligent life in another system may measure time with another cycle of an observable constant.