Where does the energy that accelerates a space probe doing a sling shot manoeuvre with e.g. a planet come from? Shouldn't the gravitational drag zero out the pull, i.e. no change in speed?Also, what's /sci/'s opinion on strangelets? does they exist? Supposedly, scientists kvetched over the potential hazard of their their existence, and tried to shut the LHC down. Also, there's been observations that support it, like GRB 240529A, potentially a strange star.
>>16974181Planets orbit the sun. When you come up behind a planet you steal some of its orbital velocity falling down its gravity well, so you can come out the other side faster with respect to the Sun.But just falling into a gravity well won't give you a speed boost coming out the other side.
I got an associates degree 6 years ago and am going back to school to study Electrical Engineering. I took Calc 1-3, Uni Phys 1&2, Linear Algebra, and Diff Eqns before and did well. What should I review? I'm starting this fall and have been studying Calculus BC on Kahn Academy.
I don't know where else to ask thisFor the past year now I have had constant gas, I need to fart every few minutes (not hyperbole) and seconds after I let it out I feel my abdomen tighten and bloat out again from gasI've tried simethicone and it doesn't seem to do shit, any advice?
What keeps our organs in place? Are they just lied down on top each other?
>>16974329You should probably review the hell out of calc 3 and linear algebra at a minimum if you don't want to get raped in your e&m classes. That's assuming your 4 year school accepts your credits from your associate's. If they make you retake those classes that might be a good thing for you long term
if virtual particles pops up as an particle and anti-particle pair every where and then annihilate, shouldn't there be explosions all over the place?
Where in Africa can I find women with slim wrists and large buttocks?South African women have very large buttocks but they have fat bellies.South Sudanese women are very thin, but they are flat.Where is the golden mean? Western Africa? The horn?What are the evolutionary pressures that produce such a body shape?
>>16974355Enemas, anal douching, and colonic irrigation are methods used to cleanse the lower bowel or colon using fluids
>>16974814The vacuum doesn't have zero energy. But if everywhere has the same energy, you can't extract work from it. Same as trying to extract work via heat within a system where the temperature is the same, it can't be done. It may even be a source of dark energy.
I'm trying to prove that it's equivalent that a topological space [math] \left(X,\tau\right) [/math] is (i) completely regular, (ii) compatible with a family of pseudometrics and (iii) uniformizable.That (i) implies (ii) should be done by considering, for all [math] x\in X[/math], all open neighborhoods [math]V[/math] of it and all continuous functions [math] f [/math] separating its exterior from [math]x[/math], construct the pseudometric [math] d\left(y,z\right) = \left| f\left(y\right) - f\left(z\right) \right| [/math] and prove this family of pseudometrics generates [math]\tau[/math].That (ii) implies (iii) should be done by noticing that each pseudometric generates a uniform structure, taking their least upper bound and proving it generates [math]\tau[/math].That (iii) implies (i) should be done by considering a compact [math]K[/math] and a disjoint closed set [math]F[/math], using the uniform regular separation result to get an entourage [math]V[/math] such that [math] V\left[K\right] \cap V\left[F\right] = \emptyset [/math] and then constructing a function with a Birkhoff-Kakutani-like trick. The function turns out to be uniformly continuous.Is my intuition right? Is there any additional trick to show the function in the last part is uniformly continuous?>>16974371That, and you also have connective tissue and muscles/tendons that give it a bit more structure.
Photonics for GPUs, photonics for quantum computing, photonics for GPUs for quantum. What is the emerging case for the enourmous amounts of money pouring into these 'photonics' companies? Is this tech viable, or just wasted on speculation? I can understand the money into fiber optic cables (faster and faster transmission through thinner and thinner toobs), but in the chips in stead of metal wires still generates heat to cause issues? Is room temperature photonics for quantum the better developing technolgoy?
>>16974355>any advice?Go to doctor? Hmmmm....nah
>>16974212Does this mean that the year of the planet becomes a tiny bit shorter because the spacecraft stole some of its orbital velocity? How short of a difference would we be talking about?
>>16979620I was trying to work out if we could miss the end of the Earth with the final asteroid impact in a million years if we didn't pollute or have satellites steel our velocity. It doesn't seem to make barely any difference with the sun being many times stronger than Earth.
>>16979636It's just going to be a mind numbingly stupidly miniscule number, like a trillion trillion billionth of a nanosecond probably.
How do magnets work at the quantum level lol.
>>16982492Not like gravity. It's a quadratic pi split through the poles instead of mass.
which Engineering field is the most Autism friendly?
Why do anons say math degrees are useless?
>>16982651social engineering
>>16984066because radians are superior
Can someone tell me this please.
>>16984377
>>16984411I think anything that could survive the evaporation would be so diluted it wouldn't even matter if it did. Quit trying to create bio weapons anon
I honestly don't understand gravity. If I make something really dense, how does that thing generate gravitational pull? What is the ratio of density between the puller and pullee required to see gravity in action? Is Gravity a nonsense concept to explain something we don't quite understand?
>>16986460It's a star push/pull special move and the planets release via pulsation.Why are you being taught different? Most humans classed as experts are dumb educated.
>>16986463No worries though, all to blame for human stupidity will be sent to hell today, within a few hours.
>>16986463In your favor, it is an alien attack, you're not mentally weak for no reason. They're taking advantage of you. All alien attackers will be sent to hell within two hours.
>>16986460Density has nothing to do with it, only mass. One ton of feathers produces as much gravity as one ton of gold.
>>16986482Retard detected.He literally thinks there's pull from Earth.
>>16986484>Yes there isNo there's not.Gather your belongings you're on the verge of the perfect hell.
>>16986482Well then replace "make dense" with "increase mass" and "density" with "mass" and kindly answer my question.
>>16986641> how does that thing generate gravitational pull?There's two answers to that: 'we don't know' and 'that is just how the universe works'. Our theories of gravity only tell us how much gravity is produced by some mass. That's it. > required to see gravity in actionWhat do you mean by "in action"? Gravity mean be weak but it's infinite range and always there so if you wait long enough something will always noticeably move.> something we don't quite understand?If by understand you mean can we predict how gravity affects everything in the universe, they yes. If by understand you mean the mechanism of how mass produces gravity, then see my first answer. But that's true for every law of physics if you follow the rabbit hole down far enough.
Why is cat gone?
>>16986777>What do you mean by "in action"?Measurable movement. What particles am I pulling with my gravity and what's the biggest size of particle say a 130lb man would be able to pull?>inb4 my mum.Also checked.
Is there a type of phone app I can download where I can take a picture of a light/electric pole and it will tell/show how many degrees it is offskew from a right angle?Does this question make sense?
>>16987680Yes, you want a plumb-bob app like smart tools.
>>16986908Anything within a mass has a gravitational influence on everything within its light cone. A 130lb person would pull equally hard on a proton, a baseball, and a planet, provided that the distance is equal
>>16974181what bug or creature is it that sounds like an item being rung up at a cash register? It is almost like a owl hoot but it sounds digital
Something has been bothering me for quite a while. If space is expanding faster than light, why don't we feel anything at all? I mean, going by that logic we should've been ripped apart to atomic scale, right?
>>16990089locally no
>>16990103But why though?
>>16990109The actual expansion itself is incredibly minuscule, enough that gravity is capable of overpowering it.The only reason it is apparently FTL on cosmic scales is because there's a shitton of practically-empty space out there and very little holding that space together. As soon as gravity becomes anything more than negligible, inflation becomes irrelevant (which is also why, say, Andromeda is moving towards us instead of away from us)
>>16987837Cicada?
I'm currently disputing a hospital bill.They billed it as a level IV (severe/urgent) when it absolutely wasn't (went in for a steroid shot), and their MDM listed things that never happened (no blood tests, no radiography).What are the chances I'll be able to get them to downgrade the charge / bill?
>>16990089> If space is expanding faster than lightThere's your mistake. It's not.The Hubble constant equations to an expansion rate of [math]\approx 2cm/s[/math] per light year of space. So on "local" scales it's effective zero. However when you are talking about scales that are on the size of the visible universe it matters. Across large enough distances you get to the point where even light cannot keep up with the expansion of all the light years it has to travel, and all the new space being createdconly makes the problem worse.It's like driving a car but someone keeps adding more road between you and your destination. Enough that no matter how fast you drive you'll never reach reach the end. You could then say that the destination is moving away from you faster than light - but at no point is anything actually breaking that speed limit.
If I live somewhere hot, why shouldn't I replace my roof with a massive fresnel lens that focuses light onto a little solar panel in the center of the house? How effectively does it suck up all the heat being shot at it? I imagine it'd look pretty damn cool.
What's preventing north korea to use the labor camps for testing bio-weapons on people and get an extremely high advantage in war technology? What prevents China to do the same with north korean labor camps? The ethical implications of being unable to test on living bodies might be the reason why we lose the war if we're forced to not use nuclear weapons.Besides, what prevents an IT millionaire with the pretense of giving food aid to do the same? A guy with enough AI knowledge who hates immigrants could literally just do a genocide without lifting a finger
>>16986641The reason is probably fairly simple, everything is interconnected like a spiderweb and mass is simply webs that are clump together. For example we are small clumps and earth is a larger clump. Moving in the spiderweb is limited by the amount of clump you are and the amount of clump you are trying to escape, that's because around big clump the webs pull and you have nothing to grab. So past the even horizon the webs are so little dense that the force you would need to get it's more than the speed of light. Now, the clump is not just mass it's also time, so it doesn't really matter if you're small without mass or big, if you have no webs around you, like you're past the event horizon it's as if you're literally going at the speed of light, so relative to you, everything else goes extremely fast in time, you're not literally slowing down your time, you are just perfectly align towards the direction of time. Yes! You can only slow down your time or speed. We're all supposed to be going at the speed of light and be immortal, very annoying. The reason why we haven't confirmed why there is no gravitational particle and everything is an emergent feature of what I'm describing is because we're very geometrically stupid, you can imagine half of our brain (the one that speaks) like an AI. It would always hallucinate and try to explain everything by relations but if the relations are not there, there is no point. Now launching rockets into space will be very cheap because of Elon Musk, so the testing without gravity will make us understand this
>>16990597Make sense but what are these clumps? Are they observable? Could they theoretically be the gravitational particles you speak of?
>>16990590Because focusing all the energy onto a small area will likely melt the solar panel instead, they aren't designed to cope with that much heat. However it's not a bad idea, go look up Solar Furnaces.
>>16990642Those are pretty neat. But ignoring the specific method of transforming the energy, would the idea work? The solar panels with lenses that ive seen all have 2 axis movement, I don't know how well they perform when stationary
>>16990642I used the word clumps interchangeably with matter, energy, time and fabric of spacetime.Implying that gravity is an emergent condition of all the above being the same. Speed of light being the default velocity.The idea is fairly simple, gravity is not a force at all, it's an emergent condition for which escaping in the direction of mass is harder, imagine if everything is made of interconnected webs, if you have a big clump it pulls towards the center, so it stretches the webs in a way that it makes them less "dense", therefore you need more energy to push in the opposite direction. This makes perfect sense because it implies that entropy is never created and information can never be lost, because if you make more dense the webs at the center of a massive object and less dense close to it, an observer outside the universe can see that the universe did not create entropy, it just rearranged the information. The problem of people trying to unifying a theory of everything is that they always try to separate things. Everything is extremely symmetrical, the extremely massive blackhole goes at the speed of light in terms of time just like the massless particle. Space isn't just time, it's speed of light, it's gravity, it's the fabric of spacetime itself. I don't think theoretical physicists have a hard time thinking this is the case, but in this case all the experiments have to be done in orbit so I guess there was not really any way to reach a theory of everything without cheap rockets launches
Can I be able to fully understand Andrew Wile's proof of Fermat's last theorem in 2027 if I barely know any math but I begin to study every day?
>>16990867You would need to have a post-graduate level of mathematics and also learn about some very specialist topics to fully understand the proof. The > 100 page proof itself is also highly complex and (at the time) all original work. Even a simple overview is non-trivial: https://www.ams.org/publications/journals/notices/201703/rnoti-p209.pdf> if I barely know any math but I begin to study every day?So to answer your question: no, not without years and years, maybe even more than a decade's, worth of effort if you're starting from 'barely any math'.
>>16990867If you find that you have a good aptitude for abstract reasoning, focus only on material that you strictly need to understand the proof (which would certainly require an expert mentor handing you detailed, hand-curated curricula knowing that your sole goal is understanding this proof), and made it your second job effort-wise, I could maybe see you getting to the point where you could explain the proof in some detail to a mathematician but not be able to answer any questions you might get back about it.
Equations with a linear variable have one solution, with a quadratic variable have two solutions, with a cubed variable have three solutions, with a quartic variable have four solutions. Is it valid to say that the fact that this is the case, is because these equations also represent geometric shapes in space with various dimensions (line, square, cube, hypercube), and the values represent the number of dimensions each of these shapes possesses, which also represents the number of directions the shape can occupy (1 direction = 1 solution, 2 directions = 2 potential solutions, 3 directions = 3 potential solutions, 4 directions = 4 potential solutions)?
>>16991231I'll rephrase your question as "is there a natural way to identify the set of roots of a polynomial of degree [math] n [/math] with a linearly independent set of directions in [math] \mathbb{R}^n [/math]"? And the answer is almost certainly no, since the latter space is compact and the former isn't.But if you want some sort of analogy between the degree of a polynomial and the dimension of a vector space, you can imagine a given degree [math] n [/math] polynomial as the characteristic polynomial of some linear (i.e. matrix) transformation on [math] \mathbb{R}^n [/math]. Then the roots of the polynomial correspond to the eigenvalues of the matrix, which you can then pick out eigenvector directions for. But for this to be really watertight you'd have to know that a set of eigenvectors with all different eigenvalues is linearly independent, which at least I don't find geometrically obvious.
I've been reading about solar panels, and learned that designs with different levels of reflectiveness are layered in a gradient. Letting incoming light pass through into the panel gently, while the light passed and bounced off the back end faces that most reflective layer abruptly on its way back up, and doesn't pass again, but bounces around the panel some more.I don't get how this idea of gradients works on the scale of photons. The way I've understood it, upon interacting with the molecules/particles that constitute the most reflective layer, with an inherent degree of reflectiveness, the light, regardless of which side it's coming from, will be impacted the same.It sounds to me that the earlier layers are changing the properties of the last layer.
>>16991775I wrote that first line poorly.I learned that there are designs that layer different materials with increasing degrees of reflectivity on the surface of the panel
