Why do electrons form pairs if they repel each other? |
- Why do electrons form pairs if they repel each other?
- What is it about space-time that limits the speed of causality to something finite?
- Are there infinite sets of 1-10 that have 4 primes?
- How is symmetry spontaneously broken in superconductors?
- Can someone explain what Clausius inequality and clausius theorem is?
- Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology
- Whats more wasteful..Throwing away plastics and glass or wasting the water to clean them for recycling?
- Do bonobos have any pair bonding, and do males invest in children?
- If you donate blood with low levels of cholestorol into a body with previously high levels of cholesterol, would there be any discernible effects?
- Do all transistors, regardless of their size, produce the same amount of heat?
- Did people who existed before electricity was a widespread thing experience the shocks you might get randomly when touching metal? What did they think it was? How do these shocks happen?
- How do we know that our Lagrangian is correct other than just because it works?
- Physical meaning of matching output impedance to headphone impedance?
- How accurately can we send large objects from the orbit back to earth? with a 100km2 margin of error or..?
- Double Split Experiment: Would you still get an interference pattern with macroscopic objects?
- Are the 'I am not a robot' puzzles for website verification used to train robots?
- How does ABE fermentation work?
- How are price-inelastic markets caused and do these markets and their condtions benefit or harm anyone?
| Why do electrons form pairs if they repel each other? Posted: 25 Dec 2018 06:45 PM PST |
| What is it about space-time that limits the speed of causality to something finite? Posted: 25 Dec 2018 06:01 PM PST The standard answer to why the speed of light is finite usually just boils down to that the speed of causality is finite. Is there a deeper explanation? How does relativity theory calculate this speed? [link] [comments]  |
| Are there infinite sets of 1-10 that have 4 primes? Posted: 25 Dec 2018 07:46 AM PST Question is basically what it says, for example, 1-10 has 2,3,5,7. 2081-2090 has 2081,2083,2087,2089. I kind of view shifting the set (say 7:16) as not counting, but maybe it gives a different result that gives infinite groups of 10 with 4 primes? [link] [comments]  |
| How is symmetry spontaneously broken in superconductors? Posted: 26 Dec 2018 05:50 AM PST I was reading about how spontaneous symmetry breaking occurs in superconductors and how Nambu proposed that by "breaking the symmetry" you give energy to break apart Cooper electron pairs resulting in giving them mass. I don't really get how this occurs in superconductors. [link] [comments]  |
| Can someone explain what Clausius inequality and clausius theorem is? Posted: 26 Dec 2018 05:34 AM PST The theorem says that for a system undergoing a cycle dQ/T=0 While the inequality says dQ/T<=0 Can someone clear it out for me? [link] [comments]  |
| Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology Posted: 26 Dec 2018 07:14 AM PST Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Biology, Chemistry, Neuroscience, Medicine, Psychology Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...". Asking Questions: Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists. Answering Questions: Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience. If you would like to become a member of the AskScience panel, please refer to the information provided here. Past AskAnythingWednesday posts can be found here. Ask away! [link] [comments]  |
| Posted: 25 Dec 2018 05:48 PM PST |
| Do bonobos have any pair bonding, and do males invest in children? Posted: 25 Dec 2018 07:47 AM PST Do bonobos have any pair bonding, and do males invest in children? I know they aren't monogamous. [link] [comments]  |
| Posted: 25 Dec 2018 06:30 AM PST |
| Do all transistors, regardless of their size, produce the same amount of heat? Posted: 25 Dec 2018 03:38 PM PST A professor of mine said that all transistors produce the same amount of heat regardless of their size. In other words, if you have two transistors and one is really small (a few atoms) and the other is large (a couple of milimeters), they would produce the same amount of heat. They also stated that this was the reason why there is a limit to how much transistors can be put on a single chip (because it would melt). Is that true? [link] [comments]  |
| Posted: 25 Dec 2018 01:07 PM PST |
| How do we know that our Lagrangian is correct other than just because it works? Posted: 25 Dec 2018 05:55 PM PST I'm trying to make my way through the course on classical mechanics and while I think I'm fine with understanding what is action and how it leads to E-L equations IF we already have Lagrangian given to us. By given I mean we just assume that it is in a form of L=T-V because it kinda appears to work. I do know that the most commonly presented to me Lagrangian L=T-V holds only in classical mechanics, but I also know that L can be written in different forms to make it usable to work with relativistic physics and also EM fields afaik, so the general idea of Lagrangian can reach much further than just classical mechanics. I have no problem with seeing how it can make descriptions of complicated system much easier and how much freedom in choosing coordinates suitable for different problem symmetries it gives. Yet still all of this doesn't explain what is Lagrangian other than that it's there because it works. It's like saying something along the lines of "it is a function for which action is the smallest and therefore it meets the requirements of least action principle, which can give us CORRECT equation of motion". The longer I try to understand this, the more I fell like there is virtually no reason for Lagrangian to be in any specific form, for example L=T-V for classical mechanics, other than because it works. It seems to me that CORRECT trajectories define Lagrangian, and not the other way around. Function is Lagrangian if it gives us the correct answer... but you have to find another way of verifying that answer. For example going back to Newtonian physics for classical problems, if it gives us the same answer then our function is in fact Lagrangian. We have some tools(action, least action principle and whole calculus), we have some objects which behave the way they please to, taking into consideration vastly different kind of effects and interactions depending what field we currently study. Then we assume that least action principle holds and there must exists some function L which can give us equation of motion based on said principle. Then we notice that for our specific kind of problem, Lagrangian in a specific form tend to work, so we assume it is the correct form and use it to other similar problems? Am I missing something crucial and fundamental here? Is there any more general property which function must have to be considered Lagrangian other than 'just work'? [link] [comments]  |
| Physical meaning of matching output impedance to headphone impedance? Posted: 25 Dec 2018 04:49 PM PST I've repeatedly read that you want an AMP's output impedance to be less than 1/8th the impedance of the headphones connected to it. I don't understand the physical considerations behind this. Impedance is just the complex ratio between AC voltage and current passing through an element in the circuit. Thus, it measures how much voltage is required to get a current flowing (magnitude) and the phase between these two. However, in all the recommendations I've seen, only the magnitude is considered. So we start with an AMP of, say, 1 Ohm resistance. Out of it comes a voltage and current that goes straight to the headphones. The headphones also have a given resistance, say 10 Ohm. But from the headphones's perspective, it only cares whether the signal going into it has the right amount of voltage and current. Why does the AMP's resistance matter here? The AMP will take a source of power and produce a suitable current and voltage (which is what the headphones care about), why does it matter what its resistance is? [link] [comments]  |
| Posted: 25 Dec 2018 07:05 AM PST |
| Double Split Experiment: Would you still get an interference pattern with macroscopic objects? Posted: 25 Dec 2018 08:31 AM PST What would happen if you scaled everything up? For example: instead of firing photons at a small plate with 2 small slits, you go to outer space and launch bowling balls at a giant plate with 2 giant slits. [link] [comments]  |
| Are the 'I am not a robot' puzzles for website verification used to train robots? Posted: 25 Dec 2018 05:10 AM PST If yes, isn't that a problem? If no, why not? (Seems like a great resource for machine learning) [link] [comments]  |
| How does ABE fermentation work? Posted: 25 Dec 2018 10:11 AM PST Hi! I'm studying ABE fermentation, a process that perduces acetone, butanol and ethanol from glucose. it consists of 4 main steps. glycolysis, chain elongation, acidogenesis and solvengenesis. I understand glycosis, but the other steps are lacking in good internet resources. would some please explain these steps? Just a general description of enzymes and reactions would be great, but references for detailed mechanisms would be even greater. thanks in advanced! [link] [comments]  |
| Posted: 25 Dec 2018 05:52 AM PST |
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