Why does removing a battery and replacing the same battery (in a wireless mouse for example) work?

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• Why does removing a battery and replacing the same battery (in a wireless mouse for example) work?
• If a Voyager I type probe were to approach Earth, at what distance/ range would it be from us until we could faesibly interact with it or retrieve it?
• Why is the inverse square law so prominent in physics?
• Why can't photon have spin 0?
• What happens to the entropy of an object that gets sucked into a black hole?
• What's the difference between soft and hard rubber on the molecular level?
• Would an hourglass measure the same amount of time on a planet/moon with a different gravitational pull?
• Discussion: MinuteEarth's Newest Video On The Geographic Origins Of Different Foods
• Can an endergonic reaction produce light?
• Is the vapor from a liquid in equilibrium hotter than the liquid itself and if so does that violate thermodynamic principles?
• Why is it currently less common for the earth to encounter a large comet or asteroid than it was millions of years ago?
• Do we know the shape of the nucleus in an atom? We learned in school that its a a cluster of protons and neutrons but is there any proof of this? Can it be one round ball holding all of the information in a quantum state(meaning it could be in any place within the ball)?
• If the size of electrons and protons are not equal, how is it that the charge/effect they have on the atom is equal?
• Is the Placebo Effect present in any animals beside humans?
• What are some examples of environmental toxic outbreaks?
• What actually changes between weaker and more powerful versions of hardware? And what makes it more expensive?
• Why is the southwest area of China cold?
• Why does FTL/tachyons defy causality?
• Is Kirchhoff's law in electronic circuits just Faraday's law for electrostatics?
• Radioactive decay, rocks, and helium, as radioactive material decay helium is released, shouldn't there be no helium in the rocks at this point due to the age of the earth and the rate of decay?
• If a telescope can show light from a star 900 years ago, would a larger telescope one the same star show the light more recently?
• How do we know that entangled particles don't have predetermined spins from the very start?

Why does removing a battery and replacing the same battery (in a wireless mouse for example) work? Posted: 25 May 2017 06:25 AM PDT Basically as stated above. When my mouse's battery is presumably dead, I just take it out and put it right back in. Why does this work? submitted by /u/J011Y1ND1AN [link] [comments]

If a Voyager I type probe were to approach Earth, at what distance/ range would it be from us until we could faesibly interact with it or retrieve it? Posted: 25 May 2017 06:37 AM PDT submitted by /u/player_zero_ [link] [comments]

Why is the inverse square law so prominent in physics? Posted: 25 May 2017 06:40 AM PDT Almost every subject that my physics coursework covers has included an inverse square law (Newton's law of gravitational attraction, Coulomb's Law, Biot-Savart Law, intensity of radiation, etc). Is there something fundamental about an inverse square law, or is this all just purely coincidental? submitted by /u/darman92 [link] [comments]

Why can't photon have spin 0? Posted: 24 May 2017 09:58 AM PDT The z-projection of the photon's spin could be m_s = 0, +-1. Why though is m_s always -1 or +1? I understand that if m_s was zero, this would imply that the spin lies in the x,y-plane. Why is this not possible? submitted by /u/dengmam [link] [comments]

What happens to the entropy of an object that gets sucked into a black hole? Posted: 25 May 2017 06:31 AM PDT Thinking of a black hole as an infinitesimal point implies it to only have one microstate. Since entropy, as I remember, is proportional to the log(# of microstates), a black hole would have zero entropy. This appears to violate the second law of thermodynamics; the entropy cannot disappear?? submitted by /u/Tom_ginsberg [link] [comments]

What's the difference between soft and hard rubber on the molecular level? Posted: 25 May 2017 06:31 AM PDT submitted by /u/zSilverFox [link] [comments]

Would an hourglass measure the same amount of time on a planet/moon with a different gravitational pull? Posted: 24 May 2017 05:59 PM PDT submitted by /u/050 [link] [comments]

Discussion: MinuteEarth's Newest Video On The Geographic Origins Of Different Foods Posted: 24 May 2017 09:35 AM PDT Hello everyone! Today on AskScience we're going to learn about where our food comes from! No, not just the ground, but the geographic origins of different foods! You can check out MinuteEarth's new video about the topic here. We are joined by the video creator Alex Reich (/u/reichale) as well as two experts on the subject. Colin Khoury (/u/Californensis) is a research scientist at the International Center for Tropical Agriculture (CIAT) and the USDA National Laboratory for Genetic Resources Preservation. He studies how changes in global crop diversity affect human health and the environment, and is particularly interested in the wild relatives of food crops. Nathanael Johnson (/u/Nathanael47) is a Grist staff writer and the author of two books. Nate specializes in stories about food, agriculture, and science. He has written pieces for Harper's, This American Life, and New York Magazine. He lives in Berkeley, California. Feel free to hit them with username mentions in your comments. submitted by /u/AskScienceModerator [link] [comments]

Can an endergonic reaction produce light? Posted: 25 May 2017 04:47 AM PDT submitted by /u/longjohnP [link] [comments]

Is the vapor from a liquid in equilibrium hotter than the liquid itself and if so does that violate thermodynamic principles? Posted: 24 May 2017 08:28 AM PDT In an adiabatic container, if you put a liquid there, at certain pressure there would be some particles with enough kinetic energy to overcome the inter-molecular forces and escape. So the gas must be made only of particles with high energy so the temperature must be higher. Summing up, what would happen is that an object at temperature T would spontaneously "split up" into an object with less temperature and another with higher temperature. Isn't this against thermodynamic principles? What is wrong with my reasoning? submitted by /u/clumsywatch [link] [comments]

Why is it currently less common for the earth to encounter a large comet or asteroid than it was millions of years ago? Posted: 24 May 2017 03:26 PM PDT I was reading Astrophysics for People in a Hurry and one of the lines gave me pause "earth's occasional encounters with large comets and asteroids, a formerly common event" NDG doesn't explain why this is, simply that it was formerly a common event. I assumed that it was either the universe was expanding and now there is more room and less collisions. Or perhaps that there are now less comets and asteroids since over time they have collided and been destroyed? Or something else I didn't think of at all? Thanks! submitted by /u/NowMoreEpic [link] [comments]

Do we know the shape of the nucleus in an atom? We learned in school that its a a cluster of protons and neutrons but is there any proof of this? Can it be one round ball holding all of the information in a quantum state(meaning it could be in any place within the ball)? Posted: 24 May 2017 05:00 PM PDT submitted by /u/587lbBingoChamp [link] [comments]

If the size of electrons and protons are not equal, how is it that the charge/effect they have on the atom is equal? Posted: 24 May 2017 04:57 PM PDT I understand that protons are about 2000x bigger than an electron. For example, why, then, does it not require ≈ 2000 electrons in a Hydrogen atom for it to have a neutral charge? Why the 1:1 ration if the electron is so much smaller? Even further, I suppose, how is it that these parts of the atom even have a charge? What is it about them that allow them to be positivie or negative? Thank you! submitted by /u/Sealove64 [link] [comments]

Is the Placebo Effect present in any animals beside humans? Posted: 24 May 2017 03:58 PM PDT submitted by /u/nondirtysocks [link] [comments]

What are some examples of environmental toxic outbreaks? Posted: 25 May 2017 05:29 AM PDT I'm looking to study environmental science in a few months and I'm reading up on toxic outbreaks but so far can only find examples such as toxic cynanobateria. I'm curious to know more. Does anyone know of any severe outbreaks? Is there an outbreak that has only presented in the last 10 years? Thank-you :) submitted by /u/Androidasylum [link] [comments]

What actually changes between weaker and more powerful versions of hardware? And what makes it more expensive? Posted: 24 May 2017 09:12 AM PDT Most all electronics come in vastly different levels of computational power, speed or storage space. But iterations of one type of hardware - especially if they are the same brand and/or form factor - tend to look the exact same, externally. CPU's are mostly the same size, aren't they? And even more so with storage devices: m.2 SSDs all look more or less the same! SD cards - or microSD - look all alike, even those times when I could find teardowns of them . . . yet, there is a vast difference between speeds or storage size! Which brings me to the second part of this question: pricing. I would instinctively say that materials should make up most of the cost of any given piece of tech - with manufacturing, R&D, marketing and the like not being as incisive, given the sheer amount of products made and sold. And given that, as I said earlier, form factors are mostly the same, I would think that the internals shouldn't differ that much! Yet, there is sadly an all too tangible difference between a i3 and a i7 CPU (and even more so across generations), or between a ~$13 32GB microSD, and a $200 256GB one! submitted by /u/Yeltsin86 [link] [comments]

Why is the southwest area of China cold? Posted: 25 May 2017 07:38 AM PDT As shown in this picture http://imgur.com/a/QqnJ6 from this website ventusky.com What makes such a large difference between India and China? submitted by /u/CasualTea_ [link] [comments]

Why does FTL/tachyons defy causality? Posted: 25 May 2017 05:18 AM PDT It is my understanding that causality, being cause and effect, would be defied by reverse-time-travel. If I know Jim is going to die before he does, I can prevent it; causality broken. That being said, if I know he's going to die before the photons showing his death strike me, I am no more able to prevent it than if I find out by conventional means. No matter how fast you are, even including FTL movements and instantaneous reflexes, you can not prevent an event that has occurred. I have a redditor's understanding of why FTL is impossible for known-particles, keep in mind that this question is about causality specifically. edit: is it just because the object would also move backward in time? submitted by /u/Carfiter [link] [comments]

Is Kirchhoff's law in electronic circuits just Faraday's law for electrostatics? Posted: 25 May 2017 01:30 AM PDT The integral of the electric field along a closed path is zero. Although electronic circuits aren't really electrostatics, as the charges are moving around. submitted by /u/crih [link] [comments]

Radioactive decay, rocks, and helium, as radioactive material decay helium is released, shouldn't there be no helium in the rocks at this point due to the age of the earth and the rate of decay? Posted: 24 May 2017 09:20 AM PDT submitted by /u/ND_Mythic [link] [comments]

If a telescope can show light from a star 900 years ago, would a larger telescope one the same star show the light more recently? Posted: 25 May 2017 04:49 AM PDT I think that title is probably a mess. I use telescope 1 to view star A and it took that light 900 years to travel to telescope 1. If I use telescope 2 (which is much stronger than telescope 1) to view star A, would it be possible that the light is only 850 (random number) years old? submitted by /u/ProgGirl [link] [comments]

How do we know that entangled particles don't have predetermined spins from the very start? Posted: 24 May 2017 02:49 PM PDT If we measure one of entangled particles, the other one immediately gets opposite spin. But how do we know that their spin wasn't "chosen" before we measured them? Like, upon creation one was up-ish and the other was down-ish. We can't possibly know their spin without measuring, right? submitted by /u/adzik1 [link] [comments]

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If you throw a waterproof speaker under water, and then dive under water yourself, can you hear the sound?

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• If you throw a waterproof speaker under water, and then dive under water yourself, can you hear the sound?
• How difficult is it to provide cell service on underground services such as subways?
• How can we measure light precisely and how can the universe expand?
• Would a spherical shell rotated about 3 orthogonal axes simultaneously feel an evenly distributed outward pressure?
• Does the human sinus cavity hold pressure?
• How evenly distributed are different types of cold virus around the world?
• Could an enclosed vacuum impart sufficient buoyancy to overcome earth's gravity?
• Is there a way to calculate the polarization of atoms in molecules?
• if atoms and particles have "rest mass" or "rest mass energy" when they're moving is their mass different? how does the higgs field relate to rest mass?
• When a flock of birds are flying around together, they seem to all be doing the exact same movements, without an obvious leader. How do they know what they're doing without colliding or moving away from each other?
• Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology
• What exactly happens when a photon is "absorbed"?
• Why does the zero-point energy of the vacuum not cause a large cosmological constant? What cancels it out?
• If we've only explored something like 5% of the ocean, how do we know The Marianas Trench is the deepest part?
• Is it possible to extract a data series' singal-to-noise ratio, if we don't have any prior information about the shape or magnitute of the signal, and the only thing we know about the noise is that it's completely random (not even a guess about its magnitude)?
• Why do star trails form concentric circles?
• Is it possible for dogs to learn commands in 2 languages?
• How come we don't inject probiotics intravenously?
• Why do some substances (metals, wax, etc.) lose density when heated, whilst others (egg, meat, etc.) tend to solidify?
• What specific equipment would I need to recreate Eddington's 1919 solar eclipse test of Einstein's General Theory of Relativity?
• Explain Gyroscopic Procession? Why 90deg? Why not 45 or RPM dependent?
• How can a single light bulb be controlled by two switches?

If you throw a waterproof speaker under water, and then dive under water yourself, can you hear the sound? Posted: 23 May 2017 11:35 AM PDT submitted by /u/Mexican_PwrRngr [link] [comments]

How difficult is it to provide cell service on underground services such as subways? Posted: 23 May 2017 11:18 AM PDT If we can have cell assisted Internet access on above ground services like trains why can we not do the same underground? submitted by /u/Fen-Jai [link] [comments]

How can we measure light precisely and how can the universe expand? Posted: 23 May 2017 09:08 AM PDT How is it possible that we can measure the speed of light so precisely?? The speed of something can only ve measured in reference to another object, can't we just measure the speed of light in two directions and have the exact speed at which that point in the earth is moving ( C - measured C = speed of that point of earth. Extra question: How is it that the universe is expanding? I have a big theory on this but how is it that we can measure the expansion of the universe?? That doesn't make any sense to me because if the universe is expanding we are also expanding, how can we know that what we percieved as 10 meters is now 20 meters if our instruments for measures also expanded and our own body, mind, eyes, atoms, and even the photons in the universe also expanded? I say this cause scientists say the universe expands faster than the speed of light... Extra extra bonus final boss easy question How can something not pass the speed of light if the momentum formula is f=m.v being f force, m mass and v volume. To move something of 1 kg faster than the speed of light you need more newtons than speed of light, does a newton always take the same energy to achieve or does one newton take more energy in relation to the one that was applied before?? Thanks in advance for clearing my mind! I think a lot about this things but school is shit, I'm 16 and we are learning movement, I wanna learn about plancks not fucking a.t+iv=fv, that's easy boring shit. (Sorry for small rant) Edit: that's my record of internet points in this site, thanks to everyone for answering!!! submitted by /u/Joseelmax [link] [comments]

Would a spherical shell rotated about 3 orthogonal axes simultaneously feel an evenly distributed outward pressure? Posted: 23 May 2017 11:01 AM PDT submitted by /u/JoeyBabutza [link] [comments]

Does the human sinus cavity hold pressure? Posted: 23 May 2017 05:09 AM PDT submitted by /u/omgwtfidk89 [link] [comments]

How evenly distributed are different types of cold virus around the world? Posted: 24 May 2017 02:57 AM PDT submitted by /u/Dios5 [link] [comments]

Could an enclosed vacuum impart sufficient buoyancy to overcome earth's gravity? Posted: 23 May 2017 09:46 AM PDT Given current material, design and fabrication knowledge, is it theoretically possible that, by incorporating sealed internal chambers into an object's design and printing the object in a vacuum, one could create a sort of "permanent vacuum balloon" that would achieve lift in Earth's atmosphere? submitted by /u/Scheissbanana [link] [comments]

Is there a way to calculate the polarization of atoms in molecules? Posted: 24 May 2017 02:14 AM PDT Like, calculate at least on a comparable scale the difference in polarization of H2O, NaNO3 and KNO3? submitted by /u/pabra [link] [comments]

if atoms and particles have "rest mass" or "rest mass energy" when they're moving is their mass different? how does the higgs field relate to rest mass? Posted: 23 May 2017 10:38 AM PDT submitted by /u/JillsWastedLife [link] [comments]

When a flock of birds are flying around together, they seem to all be doing the exact same movements, without an obvious leader. How do they know what they're doing without colliding or moving away from each other? Posted: 23 May 2017 07:24 PM PDT I don't mean geese or other birds that fly in a "V" shape, going north for the winter. More so birds like swallows and such that hang around suburban areas. I always see them flying together submitted by /u/zomangel [link] [comments]

Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology Posted: 24 May 2017 08:07 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Economics, Political Science, Linguistics, Anthropology 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! submitted by /u/AutoModerator [link] [comments]

What exactly happens when a photon is "absorbed"? Posted: 23 May 2017 05:20 PM PDT Does it turn into something else? If so, what? submitted by /u/Haplo781 [link] [comments]

Why does the zero-point energy of the vacuum not cause a large cosmological constant? What cancels it out? Posted: 23 May 2017 06:52 PM PDT submitted by /u/notyouraveragejoe201 [link] [comments]

If we've only explored something like 5% of the ocean, how do we know The Marianas Trench is the deepest part? Posted: 24 May 2017 05:52 AM PDT submitted by /u/Treefingrs [link] [comments]

Is it possible to extract a data series' singal-to-noise ratio, if we don't have any prior information about the shape or magnitute of the signal, and the only thing we know about the noise is that it's completely random (not even a guess about its magnitude)? Posted: 23 May 2017 11:11 AM PDT submitted by /u/thetimujin [link] [comments]

Why do star trails form concentric circles? Posted: 23 May 2017 06:38 PM PDT Also, does the star in the centre of the circles change depending on location? It seems counterintuitive that a star only does a set circular path. Even more so that there are points where the star is in the centre, implying the star never changes position. submitted by /u/Therexin [link] [comments]

Is it possible for dogs to learn commands in 2 languages? Posted: 24 May 2017 05:10 AM PDT submitted by /u/Joey_Adobo [link] [comments]

How come we don't inject probiotics intravenously? Posted: 24 May 2017 04:37 AM PDT Especially for individuals that have system infections primarily fungal in nature (candida). We know that many cancers are a result of systemic candida. Why would we not inject probiotika intravenously? Ive read research articles where there are pro's and con's but everything is sort of inconclusive submitted by /u/yashiminakitu [link] [comments]

Why do some substances (metals, wax, etc.) lose density when heated, whilst others (egg, meat, etc.) tend to solidify? Posted: 23 May 2017 06:19 PM PDT submitted by /u/ZOWZZii [link] [comments]

What specific equipment would I need to recreate Eddington's 1919 solar eclipse test of Einstein's General Theory of Relativity? Posted: 23 May 2017 01:27 PM PDT What kind of star charts, proper telescope, camera equipment, etc. And how much would that all cost to rent or buy? submitted by /u/S-WordoftheMorning [link] [comments]

Explain Gyroscopic Procession? Why 90deg? Why not 45 or RPM dependent? Posted: 23 May 2017 09:48 AM PDT What the title says, but can someone explain the physics of gyroscopic procession and why it manifests at 90 degrees. Why not rpm dependent (like something rotating REALLY fast would offset at 120 degrees while a slower rotation at 20 degrees? submitted by /u/keepcrazy [link] [comments]

How can a single light bulb be controlled by two switches? Posted: 23 May 2017 05:49 AM PDT It seems simple and I'm sure it is, but I can't picture a circuit with two individual switches that can each control a light bulb independently from each other. Think of turning on a light at the top of the stairs and with that switch still closed turning it off at the bottom of the stairs, then somebody else at the top of the stairs turns it back on with the top switch, even though the bottom switch is still turned it off. If there's a simple answer to how this works I'm curious to know, thanks. submitted by /u/Tom_ginsberg [link] [comments]

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How did Max Planck calculate a Planck Length?

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• How did Max Planck calculate a Planck Length?
• Is it possible for a moon to have its own moon?
• Why aren't multi-electron orbitals significantly dynamic or chaotic?
• Why was such a massive, fundamental particle like the Higgs Boson so hard to find?
• Why is it that brake rotors don't technically warp but cylinder heads and blocks can and do?
• Should we be worried about SF6 as green house gas as it has ~20,000 time more global warming potential than CO2?
• Are specialized AI chips (e.g. "TPU") only beneficial for training? Or are they needed for the actual use of the AI system even once fully trained?
• How are antidotes and vaccines made? Additionally how do they work?
• Why are elements so magically different based solely on particle counts?
• How does the process of adding neutrons to an existing element to form a new synthetic element differ from the process of forming a new isotope of the same element?
• How do we gather Quantum data?
• Carbonaceous Chondrites, why did so many of them hit earth?
• Won't solar panels also contribute to global warming?
• How are wave signals generated? (Wifi, Bluetooth, etc)
• What makes a reaction suitable for chain reaction?
• Have We Discovered Anything From Eco-Spheres?
• Does the load bearing capacity of a shaft collar increase when there are more of them?
• How does a pacemaker work?
• Why can't a bare LED have a wide spectrum?
• If we can see a star millions of light years away at night, does that mean that the light from the star has to have a direct path to earth with nothing in its way for the light to make it to us?
• If in a completely dark room a flashlight is turned on for a second why dont the photons move infinitely long so there would still be light in the room after its turned off?

How did Max Planck calculate a Planck Length? Posted: 22 May 2017 07:08 PM PDT submitted by /u/12739101 [link] [comments]

Is it possible for a moon to have its own moon? Posted: 22 May 2017 04:06 PM PDT submitted by /u/RUAUMOKO [link] [comments]

Why aren't multi-electron orbitals significantly dynamic or chaotic? Posted: 22 May 2017 04:42 PM PDT The existence and shape of orbitals in a hydrogen atom is a straightforward consequence of spherical harmonics. But when an atom contains multiple electrons, why doesn't the many-body Coulomb repulsion between the electrons lead to chaotic or dynamic behaviour? Why do simple linear approximations work so well when there are so many interactions going on? Why is the behavior of each electron described entirely by a set of quantum numbers and contained in shells that do not change over time? I have been told that the standard description of multi-electron orbitals using a 3n + 1 dimensional wave function in phase space is an ideal, linear approximation to a non-linear phenomenon. That's perfectly acceptable - I heard the same thing many times when I was studying electronics and signals. But a classical many-body system containing more than two bodies of equal mass and charge would behave in a highly chaotic manner (even in the presence of the nucleus). Obviously an atom is not a classical system but I do not understand which property of quantum mechanics is responsible for minimizing possible chaotic behavior to the point it can be almost ignored. Here are some possibilities that I have considered: The Coulomb interaction is mostly canceled out due to the fact that individual electrons are delocalized. The Pauli exclusion principle prevents electrons from moving to close to each other, thus keeping the Coulomb force minimal. The Pauli exclusion principle forces each electron to take on a different, "orthogonal" quantum state. The confinement of electrons to a potential well means that they can only take on discrete energy levels which correspond to particular sets of quantum numbers. The (relatively) localized charge of the nucleus overwhelms the influence of the delocalized electrons. Atoms are generally not thermally isolated so any chaotic resonances are damped and time evolution does not take place due to decoherence. I have no doubt that quantum numbers and shells are a very good approximation, I'd just like more clarity as to why. submitted by /u/president_alien [link] [comments]

Why was such a massive, fundamental particle like the Higgs Boson so hard to find? Posted: 22 May 2017 02:02 PM PDT I mean, it seems kind of obvious for something tiny like the neutrino to have been difficult, because it's so tiny and barely interacts with anything. But the Higgs, as I've heard described, is both massive... Like, much heavier than a proton or neutron, and also has to interact with all matter for it to have any mass at all. What's the issue? Also, same question for gravitons I guess. submitted by /u/willyolio [link] [comments]

Why is it that brake rotors don't technically warp but cylinder heads and blocks can and do? Posted: 22 May 2017 02:52 PM PDT I'm a mechanic by trade and I went to school for it for many years at night while I was in the early stages of my career but I just recently found out in another sub that brake rotors don't actually warp due to heat. I did some research and it appears from the few minutes I looked into it that brake rotors develop high and low spots due to uneven brake pad wear which causes the pulsation you feel as the driver if there is a problem. According to the research I did because the brake rotors are manufactured at extremely high temperatures they are impervious to the heat generated by the act of braking meaning that if there is an issue causing a pulsation it must be due to something other than a warped rotor. I like many other mechanics have been describing this issue incorrectly for my entire career according to what I read. That aside I got to thinking, why is it that brake rotors can't warp from the act of braking but cylinder heads can warp from overheating? The typical temperature of the coolant in the engine during normal operation is about 200 to 240 degrees Fahrenheit the actual temperature of the metal in the engine I'm not sure of but I would guess it's in the 300-500 Fahrenheit range. I would also guess that during a severe overheat the temperature might double or triple but not reach the temperature of the manufacturing process. Can someone explain how a big chunk of metal can actually warp due to an overheat condition but not a small brake rotor. submitted by /u/greasyEUtech [link] [comments]

Should we be worried about SF6 as green house gas as it has ~20,000 time more global warming potential than CO2? Posted: 23 May 2017 03:23 AM PDT submitted by /u/wubbalubadubddubb [link] [comments]

Are specialized AI chips (e.g. "TPU") only beneficial for training? Or are they needed for the actual use of the AI system even once fully trained? Posted: 22 May 2017 08:38 PM PDT submitted by /u/PeachFacer [link] [comments]

How are antidotes and vaccines made? Additionally how do they work? Posted: 22 May 2017 12:39 PM PDT I know that antidotes for snake bites are made with the venom, but I don't know how exactly the process is. Similarly do vaccines use the a small portion of the disease or is that exclusively Homeopathy? submitted by /u/SnowBabyJ [link] [comments]

Why are elements so magically different based solely on particle counts? Posted: 22 May 2017 11:07 AM PDT So I have a basic understanding of chemistry and physics, and I know that the fundamental difference between elemental atoms comes down to particles like electrons and further down like quarks. I know reactivity plays a large role in how elements behave and the number of electrons is relevant to how reactive an element is in relation to others via sharing electrons. So my questions boil down to: How is it that with just different numbers of particles in an atom, any given element can be so radically different? Helium is "smaller" than Lead, and it is a gas and makes your voice funny and Lead is a heavy metal that makes you sick. But iron is also "smaller" but it's also a solid and is a required part of the body as a mineral? Based on this, is it possible that a theory could be put together to predict an elements properties just via information contained in the Periodic Table? I'm aware of the Island of Stability. If we know of helium and iron with great certainty, and we understand how different they are, how much different might exotic superheavy elements behave? Do we have a hope of predicting this? From what we know currently, are any of those exotic materials anything more than radioactive death particles? I know that Sci Fi likes to play with ideas about a universal source code and such, but if we were to understand the base make up of all things, would there be a limit to what we could do/understand? Basically, it's amazing to me that the universe is built of tiny bits that can do anything we observe. That at the basest levels, we are all just particles doing what particles do. I would definitely love to have my understanding deepened and maybe my mind blown a bit more. submitted by /u/Pyrothei [link] [comments]

How does the process of adding neutrons to an existing element to form a new synthetic element differ from the process of forming a new isotope of the same element? Posted: 22 May 2017 08:16 PM PDT submitted by /u/splinta_xx [link] [comments]

How do we gather Quantum data? Posted: 22 May 2017 08:08 AM PDT Basically how do we learn the exact state of an atom or electron, and is there a way to do this for large groups of atoms at the same time? submitted by /u/jamezmorrell [link] [comments]

Carbonaceous Chondrites, why did so many of them hit earth? Posted: 22 May 2017 03:02 PM PDT I was teaching my class a lesson on asteroids, comets, and meteors. I have a fairly good understanding on this topic until somebody asked me what condition made it so that so many of these Asteroids hit earth. I told them that I would get back to them, so here I am! submitted by /u/DiamondDuck101 [link] [comments]

Won't solar panels also contribute to global warming? Posted: 22 May 2017 04:15 PM PDT It just came to my mind that since most solar panels are black and they're made to absorb as much sun light as possible. If an area with no solar panels decided to add panels on every roof. Won't that decrease its albedo and warm that area even more? submitted by /u/BroSofa [link] [comments]

How are wave signals generated? (Wifi, Bluetooth, etc) Posted: 22 May 2017 09:40 PM PDT Remotes, Bluetooth headphones, wifi, and countless other devices depend on waves. What mechanism or device creates the wave out of electricity? How does this work? submitted by /u/Crypt_nrg [link] [comments]

What makes a reaction suitable for chain reaction? Posted: 22 May 2017 05:23 PM PDT For example, if I bombard an Aluminum atom with a neutron, how would I know if it would create a chain reaction or not? Why would it not (or maybe) behave like U-235 would? submitted by /u/PoopsEveryday [link] [comments]

Have We Discovered Anything From Eco-Spheres? Posted: 22 May 2017 01:19 PM PDT With the popularity and widespread availability of eco-spheres, and even a large one at the America Museum of Natural History, is there anything substantial that we have actually discovered, solidified to a theory or fact or learned from the use of eco-spheres, and if so, what was it? submitted by /u/TheJamaicanGamer [link] [comments]

Does the load bearing capacity of a shaft collar increase when there are more of them? Posted: 22 May 2017 08:50 PM PDT If I had a set screw type shaft collar like this on a rod, would adding another on top of it double the amount of force the system could sustain? In this instance, the shaft collar is sitting on a surface and the rod is in tension. Would two collars, equally clamped down, double the tension force prior to collar slippage, or does the force stay the same as it would for just one collar? Given that friction is mu*Normal, I am inclined to think that the force would stay the same, but is there an n term there for multiple friction surfaces? submitted by /u/SF2431 [link] [comments]

How does a pacemaker work? Posted: 22 May 2017 11:05 AM PDT submitted by /u/vhvhvhchsan [link] [comments]

Why can't a bare LED have a wide spectrum? Posted: 22 May 2017 08:46 PM PDT I ask this question because I was thinking about how white LEDs are made by secondary emission from a phosphor or multiple dies, and I thought why can't I have an LED that emits a smooth spectrum of light like a halogen bulb without a phosphor? submitted by /u/TheSingularityEngine [link] [comments]

If we can see a star millions of light years away at night, does that mean that the light from the star has to have a direct path to earth with nothing in its way for the light to make it to us? Posted: 22 May 2017 08:20 AM PDT Can light go around the objects and still make it to us, or how can we see lights from stars millions of light years away? submitted by /u/Meat-curtain [link] [comments]

If in a completely dark room a flashlight is turned on for a second why dont the photons move infinitely long so there would still be light in the room after its turned off? Posted: 22 May 2017 08:50 AM PDT Title says it all submitted by /u/llHakarll [link] [comments]

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