𓁟 host1.bitchan.one

/sqt/ - simple questions thread (aka /qtddtot/) >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/sci eientei.xyz/sci >how do I optimize an image losslessly? trimage.org pnggauntlet.com >how do I find the source of an image? images.google.com tineye.com saucenao.com iqdb.org >where can I get: >books? libgen.rs annas-archive.org stitz-zeager.com openstax.org activecalculus.org >articles? sci-hub.st >book recs? 4chan-science.fandom.com/wiki//sci/_Wiki math.ucr.edu/home/baez/physics/Administrivia/booklist.html >online courses and lectures? khanacademy.org >charts? imgur.com/a/pHfMGwE imgur.com/a/ZZDVNk1 >tables, properties and material selection? www.engineeringtoolbox.com www.matweb.com www.chemspider.com Tips 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

⧖expiring ~29d0/26 kept1d ago

𓀐 @c*d=rZu-

⏱ 2w 👍 0

⬆ upvote 0

[⇥] sort oldest ⏱

⬆[⏱]₿⚠

👍👎✔

𓀐↩⛓⚠

[⇥] flip, oldest first

filter [-]
𓀐 @G?xBRgA3: is there a name for the difference between numbers like 0.77777777... and 0.69406306073...? also is there a way to prove there's no patterns in the number? eg 0.740360260406 is just random and eventually everything will be there whereas 0.6969696969 will repeat itself forever ?+

⬆ upvote 0↩ reply 0

𓀐 @kZCgjcA7: I 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?+

⬆ upvote 0↩ reply 0

𓀐 @T=eQv=*f: Nope+

⬆ upvote 0↩ reply 0

𓀐 @upr9T78z: 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.+

⬆ upvote 0↩ reply 0

𓀐 @GcT~uPAH: >annas-archive.org the OP needs to be updated.+

⬆ upvote 0↩ reply 0

𓀐 @vK85yhtc: If neutrons need to a stable nucleus with protonts to exist and can not exist by themselves and decay with a half life of 15 minutes, how do neutron stars exist? When a neutron decays it creates a proton, electron and electron antineutrino, so when a supernova creates the core that becomes a neutron star and the compression forces the electrons and protons together where does the supply of electron antineutrinos come from to create the neutron? Asking for a friend.+

⬆ upvote 0↩ reply 0

𓀐 @WkaYu7wF: someone tell me how true pic is I dont understand why briefly looking at 10% coverage would be more dangerous than briefly looking at a normal sun. There is a eclipse tonight and I usually see the sun from my window at the correct time of the eclipse.+

⬆ upvote 0↩ reply 0

𓀐 @-zshNvd_: Standing still on the Earth's surface it is claimed that I am accelerating at 9.834 m/s2. yet as time continues I am still standing still and my velocity is still 0, so how can I be accelerating?+

⬆ upvote 0↩ reply 0

𓀐 @DBKiE3bu: If the tectonic plates are moving at a certain level of pressure against each other, because of expected flows of magma, in such a way that we can predict how the continents are going to move for millions of years in the future, wouldn't it be possible to eventually correct for that movement and build ratchets or some form of expected notches for the plates to click along, so as to make the plates move like gears in a clock and nearly nullify massive unpredictable earthquakes in the future? You know, by spreading out the movement such that it's just a low buzz of movement people can barely feel, or even lower. Obviously, we don't have the technology right now, but is there a pathway to that that's contemplatable? Could we turn our land plates into ratcheting plates that minimized quakes at safe regular releases of pressure?+

⬆ upvote 0↩ reply 0

𓀐 @K6rBc5RK: In Naive Set Theory by Halmos, he states: "The explicit definition of an ordered pair ((a, b) = { {a}, {a, b} }) is frequently relegated to pathological set theory." What does he mean by this? Or rather, what sorts of logical fallacies can arise from Kuratowski's notion of an ordered pair? I fail to see the potential issue at hand here and would like to be made aware of it. I can read whatever you send me.+

⬆ upvote 0↩ reply 0

𓀐 @vxti?85X: Would the old ice sheets actually have had miles of sheer cliffs like this on land, or would there have been an unceremonious gradient?+

⬆ upvote 0↩ reply 0

𓀐 @7f-?pSvS: Could someone clue me in real quick or does this question deserve its own thread: to my understanding, QFT is usually only done perturbatively, and from what I can tell, can only deal with asymptotically free particles. Any bound system as simple as the Hydrogen atom ought to effectively break this approach because an electron trapped forever obviously violates the asymptotic assumption. Has there ever been any progress made for that? My background is QM of bound systems and scattering problems and I find the scattering of elementary particles unfathomably boring.+

⬆ upvote 0↩ reply 0

𓀐 @7fYD=D+-: Is the quantum foam of space the aether through which light propagates?+

⬆ upvote 0↩ reply 0

𓀐 @3WLALDd=: Why is /sci/ so slow? I don't remember ever seeing threads last over 4 days in the decade or more I've been here. Is it dying or was it killed?+

⬆ upvote 0↩ reply 0

𓀐 @Wc~W8ad2: why do temperatures equal to that of the human body feel warm/hot and not sort of neutral+

⬆ upvote 0↩ reply 0

𓀐 @wo+5b~HU: Could this type of clock be made by using any integer if you used enough mathematical operations as necessary?+

⬆ upvote 0↩ reply 0

𓀐 @FPZhH*vn: Thanks, forgot about law of sines, and the fact that the angles sum to 180°. I arrived at alt = R(cos(θ/2)+sin(θ/2)cot(FOV/2)-1), and calculated an altitude of 5,639,229m for my probe, which seems plausible.+

⬆ upvote 0↩ reply 0

𓀐 @P9=vo-F*: Everything about interstellar travel is juuuuuuust off enough to be currently impossible, almost feels like the universe has been intentionally kneecapped by some higher entity+

⬆ upvote 0↩ reply 0

𓀐 @wA7XHv*C: The trajectory of all particles, which includes photons, all end at the singularity inside the blackhole (they can only fall inwards). However that singularity is a mathematical endpoint and where our currently theories of physics break down. What physically happens to all that matter and energy at that point we simply have no idea.+

⬆ upvote 0↩ reply 0

𓀐 @tQEoahua: If a black hole is not spinning/rotating, does the matter falling into it still spin? Does every black hole have an accredtion disk beccause the black hole spins and rotates space-time outside the event horizon?+

⬆ upvote 0↩ reply 0

𓀐 @m9TGJmAD: If matter is mostly empty space how does a particle know when its going faster than light in water and emit Cherenkov radiation? How if there are two immiscible fluids one on top of the other and particle is traveling top down will the particle emit cherenkov radiation twice once in the first fluid and again when it enters the second fluid if the speed of light in the second fluid is less than the first? How thick must the fluid be for the particle to be required to emit the light, or if the fluid is thin enough the particle just say 'eh screw it' and just passes through with out emitting the cherenkov radiation.+

⬆ upvote 0↩ reply 0

𓀐 @UY*ipzs-: Scientifically, how do you win an argument against someone making an unclear point? If you leave, thats a loss by forfeit. If you ask them what that has to do with anything, thats a loss by "you are too dumb to understand". If you insult them, thats a mutual loss of "two idiots shitting up the thread insulting eachother". Is this even solvable?+

⬆ upvote 0↩ reply 0

𓀐 @D4YUYEFF: How do you prove that a magnet based perpetual motion machine is impossible? In many of the fake videos, the basic idea is that a magnet enters in the vicinity of another magnet in such a way that it leaves the magnetic field of the other magnet with more energy than it took to enter it. And this is achieved by orienting the magnets and their fields just the right way. >dah the conservation of energy Yes but is there a deeper mathematical proof why the magnetic machine is impossible that doesn't just rely on the assumption of conservation of energy?+

⬆ upvote 0↩ reply 0

𓀐 @5itSyCt~: Now, how would the existence of one partial derivative necessarily imply the existence of another? It would be one thing if I could prove that these partial derivatives [math] D_i f_i(x) [/math] themselves were partially differentiable, and then through arguing for some converse of the theorem for equality of mixed partial derivatives that all other jth partial derivatives in n must exist for each function in the set S, but I don't know anything in the toolset that would allow for this+

⬆ upvote 0↩ reply 0

𓀐 @hZ5y7znY: What if it was just approaching infinity?+

⬆ upvote 0↩ reply 0