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liamguy165 commented on a post in r/askscience
hoopdhoopwhaa 4 points

I think what you are looking for here is a better label than "simplest" - what this really is Fermat's Principle of least time. Consider a ray of light travelling from A to B - it will go quickest in a straight line, right? That's the shortest path. Consider now a ray going from A to B, but we force it to bounce off a mirror along the way.... what angle of reflection now would give the quickest path from A to B?

  • It turns out that the law of reflection (incident angle = the reflected angle) also minimises this time taken.

The photon travelling along this path can indeed also have other photons travelling nearby along other paths, but something slightly different happens - because of the slightly different path lengths, parts of the photons will constructively or destructively interfere with each other on the screen or whatever it is they land on. The end result is, if you see a specularly reflected spot, it is precisely because it came from a path that allowed constructive interference to occur.

liamguy165 1 point

Not sure I 100% follow here. How does the incident angle minimizes time? And how can we talk about a photon going from A to B, when B isn’t known to the photon? How could the photon “know” that it wants to go to a certain point in space, does it not just have a direction?

RobusEtCeleritas 2 points

Yes, it would have to be exactly perfect. It’s an unstable equilibrium, so any nonzero perturbation would destroy the equilibrium. You’d never be able to make the particle stay at the center in practice.

It’s the same with a sphere instead of a circle, just in 3D rather than 2D.

liamguy165 2 points

Interesting, I’m guessing this is equivalent to a perfect sphere resting atop a point on a hill yes? And is it actually non-zero or just close? Like if the distance to one of the points were like half the length of a nucleus, would it still destroy the equilibrium? Thanks!

RobusEtCeleritas 2 points

Interesting, I’m guessing this is equivalent to a perfect sphere resting atop a point on a hill yes?

Yes, exactly. That's another unstable equilibrium.

And is it actually non-zero or just close?

If everything about the situation is exactly perfect, the equilibrium has a "size" of exactly one point in space. The charge must exist exactly at the center, or it's not at the unstable equilibrium.

liamguy165 1 point

Right, but are we sure that if the difference was extremely extremely small (maybe a plank length?) then it would still destabilize? I feel like it wouldn’t, but at what point would the discrepancy be enough?

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liamguy165 commented on a post in r/askscience
liamguy165 1 point

It’s not so much that “splitting” an atom creates so much energy, as “splitting” one single atom produces a very insignificant amount of energy. By splitting what I really mean is fission, and more specifically, chaining fission reactions together to add up all the tiny amounts of energy for each atom to get a large amount. This is basically the process by which nuclear bombs are possible.

Uranium-235 is used because it is fissile, meaning that when we “split” it, the neutrons released from the split are enough so that it can split more than one other uranium-235 atom, and then that splits, and so on, until there is a very big boom due to the huge release in energy.

liamguy165 commented on a post in r/askscience
liamguy165 1 point

I believe this is because nodal precession is caused by a torque acting on a satellite from a body that is rotating, as this rotation creates a non-uniform gravitational field, creating said torque.

It appears that the reason it is directly proportional to omega is because the torque is directly proportional to how fast the object is rotating, as an object that is rotating faster and faster will create a lesser and lesser uniform gravitational field, which is what creates the torque to produce the precession.

liamguy165 commented on a post in r/askscience
yosimba2000 1 point

So you're saying if I'm looking at a single point in space, the E-field will keep flipping directions, but still propagates in one direction?

liamguy165 6 points

Here’s a nice visualization of what it might look like:

See how at certain times the wave is effectively cancelled, but at other times they align.

liamguy165 commented on a post in r/askscience
Midtek 2 points

How does the faraway observer measure the mass of the black hole? In principle, consider some surface enclosing the black hole and measure the gravitational flux across this surface. By Gauss's Law (or an appropriate generalization to relativity), the flux is proportional to the mass inside. Any surface you consider as the external observer must necessarily strictly enclose the black hole since the external observer has no way of describing the event horizon with his coordinate system. (That is, you can't cheat and choose the surface to coincide with the event horizon.) The infalling object will have reached points between this surface and the event horizon by some finite time according to the external observer.

Alternatively, measure the mass of the black hole system by observing orbits around the black hole. These orbits will necessarily be affected by the mass of the infalling observer.

As the infalling observer actually falls in, his mass creates a gravitational field which is communicated throughout all of space, and this is the field you are measuring as the faraway observer.

As for an evaporating black hole, it's well possible for an object to fall into the black hole and reach the singularity before complete evaporation takes place. It's all well possible for an object to fall into the black hole and for the black hole to completely evaporate before the object reaches the singularity. It just means that, in reality, the observer never actually fell past any event horizon to begin with.

liamguy165 3 points

Okay but the gravitational pull of black hole will increase through calculating the added mass, so won’t that be communicated to an outside observer by measuring the black hole’s mass through indirect observation? Then, it would seem that, given precise enough and fast enough instruments, an outside observer would know the exact time the infalling observer crossed the event horizon, they just can’t see it happening because the light is physically unable to reach them. Right? Or am I just being a crank here lol

swordfingers 3 points

When you detect them, they look like points. Prior to detection they are in delocalized state spread through the conductor. Wavefunctions of these state usually overlap and do interact, which changes their momentum distributions and pair-correlation functions, but not in the sense of charged spheres (or even points) interacting electromagnetically.

liamguy165 1 point

So when electricity flows, what is causing the flow? If there’s say one million electrons in a relatively straight line and I run a current through it, isn’t each electron moving the next one by some small amount?

swordfingers 2 points

Current is just drift motion of the electrons caused mostly by the applied voltage difference/electric field. It would flow even if the electrons were completely non-interacting (which is very close to reality in many simple metals).

liamguy165 1 point

Okay, so does the water-pipe analogy not really work then? I’ve always heard electric current being described as moving water, with voltage being increased pressure. I was told to visualize the electric flow as a ton of electrons “pushing” eachother towards the current’s direction. Is this not at all accurate or?

liamguy165 commented on a post in r/askscience
liamguy165 3 points

Interestingly enough, I have a tad bit of experience in exactly what you’re describing. I met a team from SpaceX at a proton therapy center where they were conducting experiments to quantify the ratio of dead/stuck pixels to proton flux.

They said that their ship lost navigation immediately upon entering a high radiation area, so they were experimenting on cameras and gyroscopes to get an estimate of how much error correction they will have to put on their ship so that the navigation system can function through high radiation areas, and to develop a sort of overlay to cross check with the actual video feed to see anything out of the ordinary (as with low to high radiation, there are white flashes from the proton bombardment and it’s hard to tell whether a white dot might be a star or just a proton hitting the camera).

So the answer to your question is, it is radiation in space that causes dead/stuck pixels on the ISS, and SpaceX is actually working on a way to fix this.

liamguy165 commented on a post in r/SiegeAcademy
liamguy165 2 points

There can be a lot of factors that could be doing this. Most important ones are: Are you in good health? Do you get enough sleep? Do you have good diet and exercise? Is this your first FPS? What’s your sensitivity?, etc.

If your sens is decently high, I’d recommend you lower it enough so that you have to move your arm, not your wrist, to aim. That will increase your margin for error considerably. Also make sure Raw Input is on and Mouse acceleration is off.

If your PC is bad, that could be holding you back. If you are on a laptop or a low end desktop, I’d recommend building your own PC. A good enough one that’ll last a couple years is about 400$. Check out r/PCMasterRace to find out more, it is really really worth it.

Vandorlot 2 points

Are you in good health: Yes Sleep: 7-8 hours usually Good Diet and Exersize: Decent First FPS: No, I played one fps called warface which was my first fps. I started around a year ago. Sensitivity: 1200 DPI In game its like 30 horizontal/vertical and 50 aim down sight. I only move my wrist. I used to have a terrible laptop but around june 2017 I got a great PC.

liamguy165 1 point

Yea, you need to covert your sensitivity so that you are using your arm to aim, not your wrist

liamguy165 commented on a post in r/askscience
liamguy165 2 points

Anti-matter to matter annihilation was already pointed out, but there is another method that may be able to convert matter to energy at 100% efficiency. If you were able to generate a black hole big enough so that it wouldn’t evaporate instantly, and small enough so that it wouldn’t take forever for it to emit Hawking Radiation, you could continuously feed the black hole matter at the same rate it loses mass due to hawking radiation and capture the energy emitted as a result. This is purely theoretical though, and depends on how efficient your energy capture methods are as well.

liamguy165 commented on a post in r/SiegeAcademy
liamguy165 1 point

Switching ops constantly is good, as it keeps the enemy guessing and allows you to switch for the situation or strategy. To learn the recoil, first put the “best” attachments on all the guns (there’s a guide linked in the sidebar I believe) and then practice with the ops you use most. For the ones you rarely use, at the beginning of each round trying tapping, bursting, then spraying to get a feel for it.

liamguy165 commented on a post in r/SiegeAcademy
YeahTheRAG-TAG -3 points

Uh yes you can? Im not even that good (only gold 2) and i went down to copper on purpose to troll coppers thinking they were going to be garbage, they werent even that bad, so i started playing normally again and got back to my usual rank (just so you know, i was throwing in a full squad of my friends, but solo queued back up by myself because they were on smurf accounts so didnt care about ranking up)

liamguy165 1 point

You went down to copper to troll coppers? Sounds like you’re adding to the problem man.

YeahTheRAG-TAG -5 points

Why dont you go comment that on the hundreds of videos on youtube where they do this and its funny as shit?

liamguy165 5 points

Just saying you are making it harder for people in copper to get better and get out of that rank. Sure it’s funny, but it doesn’t help you or them get better.

liamguy165 commented on a post in r/SiegeAcademy
liamguy165 0 points

I’d HIGHLY recommend that you buy powerline adapters if you are living at your house. They cost about 50$ and give the same connection as an ethernet cable. You plug one into an outlet, a small ethernet cord connects your computer to it, and you do the same thing at your router.

liamguy165 commented on a post in r/SiegeAcademy
TRYHARD_Duck 4 points

Yes and no. You've also got to give yourself credit for the things you did right in order to foster better habits based on positive feedback. After all we play this game for fun and I know several people who are too hard on themselves for every single little mistake. It's just a game...

But it's good to write out a few takeaways from each game to see what went well and what needs improvement.

liamguy165 1 point

True, it’s easy to either yell at yourself for each and every small imperfection you commit, or blatantly do everything wrong and blame your teammates. Most people fall into one of the two categories, and change their perspective each match or even during a match. You always need to remove that yes it is a team game, your team will make mistakes, but also this is a game that can be won through pure solo skill, and you will make mistakes too. No one will play a game 100% perfectly, so you just have to do your best, give credit where credit is due, and use each blunder as an opportunity to improve.

Joseph_Brony 13 points

Do not attempt to board the helicopter! If you need medical attention, report to the triage tent at the border station.

liamguy165 3 points

Most underrated comment 2018

Piglyt 1 point

To add on to this; it’s important to realize what the best win condition is for your round. Do you go for kills or OBJ? Almost every time it will be objective, but every once in awhile it could be elimination, and realizing that could make the round a lot easier.

If they have defuser locked down it might be easier to clear the site first then go after the roamers.

liamguy165 2 points

Exactly. On defense if you’ve won all the sites but 1 and you have to pick the shitty last site, then it may be beneficial to be aggressive and go for kills than try to defend the OBJ as it may just be useless

ohiostate454 10 points

My favorite is if you are down 3 rounds and all your randoms die right away then forfeit while you are still alive.

liamguy165 7 points

Yea that’s all too common too; Often when we’re done 3-0 the team decides to run out, spawn peek, go for kills, etc.

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liamguy165 commented on a post in r/SiegeAcademy
liamguy165 5 points

Honestly Maestro is probably better, as he is insanely useful. He can get significant intel, can finish enemies, distract them, etc. One of the most underrated uses for Maestro is to put an evil eye near a common hatch or door that gets blown up, and then when the thermite or hibana is going off, just shoot them with your evil eye.

liamguy165 commented on a post in r/JustLearnedTheFWord
--orb 0 points

Yes, because no younger people are republicans, and old people only vote Trump because they're all uneducated.

Keep drinking the kool-aid.

liamguy165 2 points

Says to keep the politics out of the title, then posts a political comment...

--orb -1 points

Literally only in reply to what he just said in the title. Are you that dense?

liamguy165 2 points

No, I’m not, because I don’t insult people when I’m wrong.

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liamguy165 commented on a post in r/askscience
porncrank 2 points

I think you mean silicon?

liamguy165 3 points

No, I mean sulfur. Further down that page it talks about it. It has drawbacks in reactivity however it can form long chains just like carbon.

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