/sqt/ - simple questions thread (aka /qtddtot/)Previous thread: >>16893204>what is /sqt/ for?Basic questions regarding maths and science. Also homework.>where do I go for advice?>>>/sci/scg or >>>/adv/>where do I go for other questions and requests?>>>/wsr/ >>>/g/sqt >>>/diy/sqt etc.>how do I post math symbols (Latex)?rentry.org/sci-latex-v1>a plain google search didn't return anything, is there anything else I should try before asking the question here?scholar.google.com>where can I search for proofs?proofwiki.org>where can I look up if the question has already been asked here?warosu.org/scieientei.xyz/sci>how do I optimize an image losslessly?trimage.orgpnggauntlet.com>how do I find the source of an image?images.google.comtineye.comsaucenao.comiqdb.org>where can I get:>books?libgen.rsannas-archive.orgstitz-zeager.comopenstax.orgactivecalculus.org>articles?sci-hub.st>book recs?4chan-science.fandom.com/wiki//sci/_Wikimath.ucr.edu/home/baez/physics/Administrivia/booklist.html>online courses and lectures?khanacademy.org>charts?imgur.com/a/pHfMGwEimgur.com/a/ZZDVNk1>tables, properties and material selection?www.engineeringtoolbox.comwww.matweb.comwww.chemspider.comTips for asking questions here:>avoid replying to yourself>ask anonymously>recheck the Latex before posting>ignore shitpost replies>avoid getting into arguments>do not tell us where is it you came from>do not mention how [other place] didn't answer your question so you're reposting it here>if you need to ask for clarification fifteen times in a row, try to make the sequence easy to read through>I'm not reading your handwriting>I'm not flipping that sideways picture>I'm not google translating your spanish>don't ask to ask>don't ask for a hint if you want a solution>xyproblem.info
>>17016986Previous thread: >>16944314
>>17016986I have one. If the double slit interference is an optical phenomenon where light waves pass through two closely spaced slits and overlap, creating an alternating pattern of bright and dark bands (fringes) on a screen. What would happen to the bands if you sent a single photon through, then waited some time (Like a day) before firing another one through. Would the inference band show signs of slight deformation to one area, if the proton restarts its first position?
If an electron's position is very well defined, why does this cause its kinetic energy to rise?
Are there any developments on the Riemann Hypothesis lately?
>>17017235Why is it well defined in the first place? Is there perhaps something keeping it there...
Anons I got a Dover print of Emily Riehl's undergrad book to supplement another text. Is it worth digging into?
>>17018509Nope
conditional probabilityhttps://onecompiler.com/commonlisp[code];; Use defparameter to define global variables in the REPL(defparameter *boxes* '((1 1) (1 0) (0 0)))(defun run-bertrand-trial () (let* ((box (nth (random 3) *boxes*)) (first-coin (nth (random 2) box))) (list box first-coin)))(defun run-simulation (num-trials) (let ((gold-observations 0) (gold-box-count 0)) (loop repeat num-trials do (let* ((trial (run-bertrand-trial)) (box (first trial)) (coin (second trial))) (when (= coin 1) (incf gold-observations) (when (equal box '(1 1)) (incf gold-box-count))))) (format t "Total trials with gold observation: ~d~%" gold-observations) (format t "Trials where box was Two-Gold: ~d~%" gold-box-count) (format t "Empirical Probability: ~f~%" (float (/ gold-box-count gold-observations)))));; Execute the simulation(run-simulation 10000)[/code](there are dummies on /pol/ who need to see this)
If light is a wave, why can it be breaked down to smallest possible parts called the photons? A wave in the ocean cannot be breaked down to its smallest part unless you're talking about just one wave.
>>17016994How long you wait before sending through each particle doesn't matter. Once you have a large enough sample size the interference patter will still appear.
>>17021631What do you think water is made from anon??
>>17016986Scientifically, why am I me and not someone else?
>>17021669>you're on the trolley tracksI've never seen this version of the trolley problem before. Would you sacrifice your life to save other people on the other track?
>>17021644The reason why there is a wave on water is because water molecules are interacting with each other. The way how light is a wave is not like photons were interacting each other producing waves.
I am not knowledgable and am a beginner in all of this. Here is my question: People say the double slit, superposition, and entanglement are not weird, just that they are presented as weird.How true is this? Are they just overhyped and not really 'breaking everday human logic'?
Does a knot have spooky action at a distance?If I change the properties of the knot at one end, the nature of my string at the other end can be either knotted or unknotted.Could particles be complex knots in some spacetimey fabric?
>>17022206they are connected by the same rope, so it's neither spooky nor at a spooky distance.
>>17016986>annas-archive.orgthe OP needs to be updated.
>>17022250https://4chan-science.fandom.com/wiki/Obtaining_textbooks has a good list for the OP, specifically https://open-slum.org/ which tracks library mirrors.
>>17016986
>>17022203They probably mean that the math that describes all those things (and QM in general) is not particularly complicated. It's mostly just basic linear algebra. However the physical effects are so outside of everyone's every day experiences is what leads to all the problems in their understanding.
>>17021631>If light is a waveLight is associated to a type of object in the universe we live in. A wave is a mathematical object. Saying "light is a wave" is the short way meant to imply that the behavior of light can be predicted by modeling said behavior with mathematical waves. Saying "light is a particle" is a short way meant to imply that the behavior of light can also be predicted by modeling said behavior from a mathematical "point particle". Light simply is what it is - you don't need a description of a dog with genetics or biology to have a dog exists. We're using math with waves and points to describe light; light doesn't "care" that it's surprising to humans that it can be described using both. >why can it [be both wave and particle]No one knows (no consensus in the community). Maybe pilot wave theory is right. Maybe wave funciton collapse is a real thing. Any attempt at explanation is just a theory
Smart people seem to like linguistics. Anyone know if there is a connection between the words >wood (like wud)>water (like watr or wudr)I noticed how I was pronouncing it and realized the two sounded similar. Google didn't bring anything up.
>>17022849No, just a coincidence I'm afraid. The etymology of the two words is very different. In fact the word for "water" in all languages may be the only word that can be traced back to a single common root - apa / aqua.
>>17016986How do I explain scrotumniggas cat to a class of 5th graders? Can't find anything on the Internet
>>17016986I'm trying to turn sodium bicarbonate into sodium carbonate aka washing soda. I've seen differing instructions on the internet. Basically you're supposed to heat it but some say different temperatures and different cooking times. Does anyone know the correct temperature and cooking time? Also I heard that aluminum reacts with washing soda which would neutralize its effectiveness. Should I avoid using my aluminum pan to cook it?
>>17022924The dictionary of Indo-European roots on my shelf is one of my favorite possessions.
>>17022266i don't get it
Will ice cubes actually sink in warm enough water? Because according to this chart ice seems to have greater density than water at something like 80 degrees celcius
>>17026947itI'm not sure where that chart got it's data from, but the ice density looks wrong. In fact it shouldn't be a smooth graph, there's a discontinuity at the freezing point. The correct numbers should be much lower. All this means is that ice would still be less dense than hot/boiling water.
>>17026962That's just one of the charts that popped in google image search. But they all looked similar and smooth curves.
A neutrino detection device works by having a tank full of water and surrounding it with very sensitive cameras. When a neutrino messes with an electron of a water molecule, it creates Cherenkov light which is detected.Does this mean that if you went to the bottom of Mariana trench with a submarine where sunlight could not reach at all, and you had a very sensitive camera, you would see tiny flashes of light as neutrinos interact with the water molecules?
>>17027329Think about it. The phase change from water to ice means the graph can't be smooth.
>>17027746That's what I thought. And that's why I thought the graph was strange
I don't know if this question can be answered but how many streets loop vs how many end? Or, what percentage of streets loop vs end?To expalain. Say a simple version: street A terminates at street B, street B terminates at street C, street C terminates at street D and street D terminates at street A. That street loops.vsStreet A terminates at street B but street B terminates and forces the driver to turn around at its end. Even though A terminates at B because B terminates with no outlet, street A can be said to end.This of course would be directional as many streets terminate at places where a left or right turn is possible. I would claim that most streets loop, but I don't know and I don't know how I would go about proving that. There's a lot of Cul-de-sacs and dead ends out there.
I am an undergraduate economics student, recommend me must-read scientific literature regarding economics /sci/.
>>17028438
>>17028436They invented graph theory for this, there are also sparse matrices you can populate with this info with a bunch of time, a machine learning algorithm, and google maps (they will cut off your API access before you actually get enough data to do the answer though -- you should probably stick to scanned images of old map atlases)
>>17028667I didn't laugh
how do i know if a textbook will be good or bad? for example if i want to learn to learn about mathematical logic how do i find a good textbook for it? without wasting time trying loads of textbooks until you realise they suck
>>17028757Most people don't laugh at things that aren't jokes. Good on your for having all your marbles together.
>>17025359Not all ovens are the same. Honestly, if you're trying to determine yield percentage, you could try measuring the weight difference (iffy) or measure pH (also iffy if you don't have the tools). Try out a ceramic pan to avoid risk if you want.
>>17020775hmm?
>>17022250yes
Pi to the power of square root of two. Is this an irrational number?
this is kind of outside of the scope of whats being asked for the thread but you guys ever see shit that you can't find any reasonable explanation for? weird personal experiences or even just spooky vids on the internet? do those kinds of things just strike you as entirely fake despite how unsettling it may appear to be or whatever personal claims have been made about said videos? or are those sorts of things you just shrug and say maybe about?
>>17031543Irrational, yes, but also transcendental
