How do scientists studying antimatter MAKE the antimatter they study if all their tools are composed of regular matter?

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• How do scientists studying antimatter MAKE the antimatter they study if all their tools are composed of regular matter?
• If 2 black holes were close enough that their event horizons were overlapping, could things in that overlapped region escape those black holes?
• Ask Anything Wednesday - Engineering, Mathematics, Computer Science
• When measuring the energy of a lightning bolt, or any electrical discharge, is the energy of the bolt uniform through out it, or does the energy decrease as the bolt travels to its "target"?
• Electron diffraction - how did they know that graphite had the atom spacing of the wavelength of an electron if they didn't know the wavelength of an electron before doing the experiment?
• How did Scott and Amundsen KNOW when they reached the south pole (100 years ago)?
• Why do some candle flames burn "taller" than others?
• Why does overwatering a plant, kill it? (Wither away)
• When you take a photo of a computer monitor, TV, etc. Why do you get the weird warped screen door effect?
• Why does cold hurt?
• Since matter and antimatter react the same way to light, how can we tell that distant galaxies are made of matter (instead of antimatter)?
• What determines the critical temperature of a superconductor?
• Does antimatter follow the exclusion principle?
• If a nuclear bomb uses under 100 pounds of radioactive material, how is such a large area contaminated after the reaction?
• Do all neutrons have the same mass?
• What would the result be of 2 identical AIs played chess?
• Are Coulomb's Law and the Law of Universal Gravitation related?
• Inspired by my town's massive condo boom... What is the lifespan of current skyscrapers and tall condos, and what will need to happen when they finally get too old?
• Say I make a "Neutron Oven" using Polonium-210 and Beryllium-9; would all the isotopes change at the same time or would I end up with some atoms picking up 1 Neutron and another picking up 15?
• Is there an equivalent phenomena for blackbody emission/absorption but for sound/vibration?
• What is enthalpy?
• Are emission and absorbtion of a material always symmetrical?

How do scientists studying antimatter MAKE the antimatter they study if all their tools are composed of regular matter? Posted: 16 Jan 2018 05:24 PM PST submitted by /u/BobcatBlu3 [link] [comments]

If 2 black holes were close enough that their event horizons were overlapping, could things in that overlapped region escape those black holes? Posted: 16 Jan 2018 09:07 AM PST When I first thought of this, I was imagining 2 black holes of the same size with their event horizon's overlapping. I was also thinking that for the sake of theory, it would be good to imagine that both black holes were pinned in place. submitted by /u/jkg1993 [link] [comments]

Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 17 Jan 2018 07:07 AM PST Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Engineering, Mathematics, Computer Science 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]

When measuring the energy of a lightning bolt, or any electrical discharge, is the energy of the bolt uniform through out it, or does the energy decrease as the bolt travels to its "target"? Posted: 16 Jan 2018 05:22 PM PST edit: i should've added that the energy decrease would be due to energy dissipation to matter around it. submitted by /u/wazabee [link] [comments]

Electron diffraction - how did they know that graphite had the atom spacing of the wavelength of an electron if they didn't know the wavelength of an electron before doing the experiment? Posted: 17 Jan 2018 04:11 AM PST In the electron diffraction experiment, electrons were passed through a graphite crystal (the atom spacing was similar to the wavelength of the electrons) to prove that electrons produced a diffraction pattern and so also existed as waves. So how did they know that graphite had the atom spacing of the wavelength of an electron if they didn't know the wavelength of an electron before doing the experiment. Trial and error? submitted by /u/bedroomcylinder [link] [comments]

How did Scott and Amundsen KNOW when they reached the south pole (100 years ago)? Posted: 17 Jan 2018 06:12 AM PST I am wondering about the precision of their navigational instruments close to the actual south pole. A compass will be very inaccurate close to the magnetic pole, and I have no real feel for the accuracy of a sextant when the sun is so low above the horizon. It would also require accurate clocks to get the correct local noon (tricky in extreme cold). They did go due south once they left the Ross Ice shelf, but my question is about accuracy. I am a bit surprised that Scott and Amundsen got to the same spot and called it the pole - can someone discuss the navigational tools and their limitations that were available to them? submitted by /u/Greebo24 [link] [comments]

Why do some candle flames burn "taller" than others? Posted: 16 Jan 2018 07:10 PM PST I was lighting several candles recently and noticed that each gave a remarkably different flame size, despite each candle sharing a similarly-sized wick. Some of the flames weren't very tall and were more round, whereas others were long and slender. I've always wondered about this, so I'm hoping the candle-lovers can satisfy my curiosity. submitted by /u/bio_boi [link] [comments]

Why does overwatering a plant, kill it? (Wither away) Posted: 17 Jan 2018 03:30 AM PST submitted by /u/geolazakis [link] [comments]

When you take a photo of a computer monitor, TV, etc. Why do you get the weird warped screen door effect? Posted: 17 Jan 2018 05:08 AM PST submitted by /u/benjamin051000 [link] [comments]

Why does cold hurt? Posted: 16 Jan 2018 08:57 AM PST I understand why hot hurts because it is actually damaging the skin, but what makes it so when I get in my car in the morning, the cold of the seat is cold enough to hurt? submitted by /u/InfallibleTheory [link] [comments]

Since matter and antimatter react the same way to light, how can we tell that distant galaxies are made of matter (instead of antimatter)? Posted: 16 Jan 2018 11:17 PM PST We have no interaction with distant galaxies and some of them are isolated to the point that they don't interacy with anything around them (correct me if I'm wrong). So how can we tell what they are made of? submitted by /u/teoreds [link] [comments]

What determines the critical temperature of a superconductor? Posted: 17 Jan 2018 12:23 AM PST submitted by /u/famfamislitit [link] [comments]

Does antimatter follow the exclusion principle? Posted: 16 Jan 2018 07:38 AM PST submitted by /u/oakenwolf [link] [comments]

If a nuclear bomb uses under 100 pounds of radioactive material, how is such a large area contaminated after the reaction? Posted: 16 Jan 2018 08:29 AM PST submitted by /u/FleetAdmiral33 [link] [comments]

Do all neutrons have the same mass? Posted: 16 Jan 2018 05:47 PM PST In chemistry today there was an example there was an example of a magnesium atom and 2 other isotopes, but the math didn't make sense because the only change should have been in neutrons adding roughly one more AMU but the change was different, from magnesium-24 to magnesium-25 was 1.0008 AMU and from magnesium-25 to magnesium-26 was about .9967 AMU. What can explain the difference? submitted by /u/callmemateo [link] [comments]

What would the result be of 2 identical AIs played chess? Posted: 16 Jan 2018 07:49 PM PST submitted by /u/l_l_l-illiam [link] [comments]

Are Coulomb's Law and the Law of Universal Gravitation related? Posted: 16 Jan 2018 08:12 PM PST The laws look very similar, although this might be my error. One is k(q1)(q2)/r2 The other is g(m1)(m2)/r2 Is this merely a coincedence, or were they derived similarly, or what? submitted by /u/AnInnocentCivilian [link] [comments]

Inspired by my town's massive condo boom... What is the lifespan of current skyscrapers and tall condos, and what will need to happen when they finally get too old? Posted: 16 Jan 2018 06:13 AM PST submitted by /u/infernalmachine000 [link] [comments]

Say I make a "Neutron Oven" using Polonium-210 and Beryllium-9; would all the isotopes change at the same time or would I end up with some atoms picking up 1 Neutron and another picking up 15? Posted: 17 Jan 2018 02:56 AM PST This is a complex question I realize. I just question how companies can manufacture 99% pure isotopes of metals and other elements. My goal is to add a Neutron (or 5 more won't hurt) to an element which would ideally result in a decay that would leave me with a more favorable material that I would want to apply the same process with. Or, if that's impossible, is there a good way to separate isotopes? Say I had Tungsten-184. I try to add a single neutron across a powdered board as best I can so that in 75 days it would result in a daughter isotope of Rhenium-185. But something tells me it wouldn't be that easy. Would I just end up with an impure mix of Rhenium-185, Tungsten-186 and Rhenium-187 -> 190. Rhenium 185 and 187 are stable, but the others would result in Osmium which isn't necessarily a bad end product. I considered magnetism but all similar metals all have similar magnetism. One thing that would change is that they would all have different weights. If they haven't quickly decayed and left a daughter isotope (and would the decay process screw with other nearby isotopes?). Say I have a strong neodynium magnet capable of 255 lb of force, applied to a container of mixed isotopes/or product of should surely seperate them over time. Heaviest on the bottom, lightest on the top. I'm a little bit of a noob when it comes to quantum mechanics. Maybe some professionals can help me understand a little bit better or point me in the right direction. Thank you. submitted by /u/Rays-of-Sunshine [link] [comments]

Is there an equivalent phenomena for blackbody emission/absorption but for sound/vibration? Posted: 16 Jan 2018 10:16 AM PST I know of blackbody radiation, a heated object (with certain specificities) emits a continuous spectrum of light due to the fluctuating particles that composes the object due to thermal agitation. Demonstration: heat a metal hot enough and it will shine in red or even all optical colors. Is there an equivalent for sound? Where a metal vibrates into all it possible sound frequencies due to thermal agitation? Can you heat a metal so it makes audible noise? If this doesn't happen then why is that? Edit: my question does not concern the inside of the solid, consider a box with a hole, does heating (or cooling) generate audible sound transmitted trough air? Edit2: I realized I just described a teapot, so forget the hole in the box for the sake of the argument Update: it seems like the solutions comes with the idea that gases do not have phonons submitted by /u/MaoGo [link] [comments]

What is enthalpy? Posted: 16 Jan 2018 11:57 AM PST And can we measure it directly ? submitted by /u/1las [link] [comments]

Are emission and absorbtion of a material always symmetrical? Posted: 16 Jan 2018 07:15 PM PST As a motivating case, does the fact that a shiny aluminum cooking sheet reflects IR (low absorbtion) necessarily imply that it has low emissivity as well, or is that a coincidence? It sounds like any asymmetry might be a one-way thermal valve, which sounds like Maxwell's demon. But from Wikipedia on absorbtion spectra: "Emission can occur at any frequency at which absorption can occur, [but] emission spectrum will typically have a quite different intensity pattern from the absorption spectrum [...]." On the other hand irinfo.org has an article which I think implies metallic surfaces do emit and absorb the same amounts and at the same wavelengths. submitted by /u/markfickett [link] [comments]

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Wikipedia explains that String Field Theory is a part a of Quantum Field Theory while regular String Theory is not. What exactly is the difference between String Field Theory and String Theory?

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• Wikipedia explains that String Field Theory is a part a of Quantum Field Theory while regular String Theory is not. What exactly is the difference between String Field Theory and String Theory?
• What is happening at cellular and tissue levels in “muscle knots”?
• Prior to the moment of aggressive inflation of the Universe, all matter was compressed into a space smaller than a proton. I understand the hypotheses leading to an expanding Universe, but why didn't all matter in such a tiny space simply result in a Universe-massed black hole?
• How does the hardware/software stack in cell towers manage 1000s of users simultaneously?
• Why is spin imortant when talking about it in relation to particles and what is meant by spin determining how the particle looks from different directions?
• How do we know that quarks exist?
• How do we know a black holes rotate? And why would it make any difference if it rotates or not?
• What is happening on a circuitry level when I turn the brightness up or down on my phone?
• What actually kills a person when their body temperature is too low?
• Are there any diseases that affect both plants and animals?
• In a=v²/r acceleration decreases with a larger circle. In a=ω²r, acceleration increases with a larger circle. Why is this?
• I'm reading a book that mentions Nazis were able to determine the weather in London from the hourly broadcast of Big Ben's Chime on BBC. How would a physicist in 1940s find that out?
• How do lattice vibrations in conductors affect resistance?
• What is meant by the “active expulsion of the magnetic field” in the Meissner effect?
• Why does a magnet levitate above a superconductor?
• This morning I got a cardiac stress test with technetium-99. How is it made?
• How does an object cool in space if it's a vacuum with no adjacent atoms influencing it?
• Why is symmetry so important?
• There's no such thing as a perfect vacuum. But what's the closest to a perfect vacuum in nature? In the least dense part of space, how far apart are two atoms?
• Why do we sneeze, and what is happening during a sneeze?
• What determines the phasing of emitted photons?
• Why is the maximum density of water achieved at 4°C, then becomes less dense until the freezing point?

Wikipedia explains that String Field Theory is a part a of Quantum Field Theory while regular String Theory is not. What exactly is the difference between String Field Theory and String Theory? Posted: 15 Jan 2018 04:10 PM PST submitted by /u/_horus2 [link] [comments]

What is happening at cellular and tissue levels in “muscle knots”? Posted: 15 Jan 2018 06:29 PM PST submitted by /u/Wdenners [link] [comments]

Prior to the moment of aggressive inflation of the Universe, all matter was compressed into a space smaller than a proton. I understand the hypotheses leading to an expanding Universe, but why didn't all matter in such a tiny space simply result in a Universe-massed black hole? Posted: 16 Jan 2018 02:15 AM PST submitted by /u/Kruciff [link] [comments]

How does the hardware/software stack in cell towers manage 1000s of users simultaneously? Posted: 16 Jan 2018 07:29 AM PST Lots of questions here: What kind of stack does a cell tower run for management? Embedded or full-fledged OS? What kind of databases (if any)? Is the hardware industrial like data-center level stuff or can it be run on consumer-grade equipment? On an individual tower how are requests prioritized? Queues in FIFO order or something more complex? Do they use full-blown databases for state management or in-memory data structures? On an individual tower when receiving/sending packets is the "unique identifying" part of a signal solely data-based (like an IMEI encoded into each packet) or is there a hardware component as well IE signal is modulated uniquely based on device? How autonomous are individual towers? If my device is within range of 3 towers how do they decide which one will manage my device? Are there "supervisor" nodes managing multiple towers to make those kind of decisions? If so what kind of hardware does that have to run and how many towers can be managed at once? Following #4, does tower management ever have manual input from the carriers like during high-population events IE sports games, concerts, etc. where usage is out of the norm? Mainly I just want greater insight into how so many users are handled simultaneously with such little latency. More karma if I can get a developer/ops perspective on this topic! submitted by /u/FoxxMD [link] [comments]

Why is spin imortant when talking about it in relation to particles and what is meant by spin determining how the particle looks from different directions? Posted: 16 Jan 2018 06:27 AM PST submitted by /u/Xtratimesoccer [link] [comments]

How do we know that quarks exist? Posted: 16 Jan 2018 04:33 AM PST submitted by /u/lemonade_lmao [link] [comments]

How do we know a black holes rotate? And why would it make any difference if it rotates or not? Posted: 16 Jan 2018 04:17 AM PST Saw this post in r/space about a black hole spewing out matter because it rotates very fast, but it still remains its gravity right? submitted by /u/kannienchenman [link] [comments]

What is happening on a circuitry level when I turn the brightness up or down on my phone? Posted: 16 Jan 2018 07:08 AM PST submitted by /u/Yung2Neyes [link] [comments]

What actually kills a person when their body temperature is too low? Posted: 15 Jan 2018 04:59 PM PST What is the first fatal effect of lowering a person's body temperature? I bet a lot of bodily functions cease to function at too low temperature on different scales. Is there a big one? Maybe one that occurs way before the rest. Thanks. submitted by /u/minminminmin [link] [comments]

Are there any diseases that affect both plants and animals? Posted: 15 Jan 2018 04:57 PM PST If not are there any diseases that would be especially scary if animals could contract them? submitted by /u/Neato_Orpheus [link] [comments]

In a=v²/r acceleration decreases with a larger circle. In a=ω²r, acceleration increases with a larger circle. Why is this? Posted: 16 Jan 2018 04:47 AM PST To me this does not make sense because in both cases the object must be changing direction more slowly with a larger circle, yet the acceleration increases. Is there some intuitive way to understand this? submitted by /u/ten_mile_river [link] [comments]

I'm reading a book that mentions Nazis were able to determine the weather in London from the hourly broadcast of Big Ben's Chime on BBC. How would a physicist in 1940s find that out? Posted: 15 Jan 2018 08:16 AM PST In Sapiens, Yuval Noah Harari mentions During World War Two, BBC News was broadcast to Nazi occupied Europe. Each news programme opened with a live broadcast of Big Ben tolling the hour - the magical sound of freedom. Ingenious German physicists found a way to determine the weather conditions in London based on the tiny differences in the tone of the broadcast ding-dongs. This information offered invaluable help to the Luftwaffe. When the British Secret Service discovered this, they replaced the live broadcast with a set of recordings of the famous clock. I couldn't find a source for this information except a WW2 Forum that is discussing the same book and a reddit thread that links to a podcast. Therefore, I wonder if this is true at all. If it is, how would a physicist go about finding weather of a place from a live television broadcast? Will the tiny differences in pitch not fade out in the broadcast? submitted by /u/Volis [link] [comments]

How do lattice vibrations in conductors affect resistance? Posted: 16 Jan 2018 06:54 AM PST submitted by /u/nomitycs [link] [comments]

What is meant by the “active expulsion of the magnetic field” in the Meissner effect? Posted: 16 Jan 2018 06:31 AM PST submitted by /u/nomitycs [link] [comments]

Why does a magnet levitate above a superconductor? Posted: 16 Jan 2018 06:06 AM PST Simple as possible please :) submitted by /u/nomitycs [link] [comments]

This morning I got a cardiac stress test with technetium-99. How is it made? Posted: 15 Jan 2018 03:08 PM PST What form is it in as an injectable drug? What kind of radiation does it emit? How long will I be radioactive? :) submitted by /u/joegee66 [link] [comments]

How does an object cool in space if it's a vacuum with no adjacent atoms influencing it? Posted: 15 Jan 2018 06:35 PM PST Without any adjacent atoms vibrating slower to cool an object, how does it cool down in space? Why doesn't it just stay at the same temperature? If it loses energy, what causes it to lose energy and cool vs. just keep the same temperature without any external influence? submitted by /u/dr1zzzt [link] [comments]

Why is symmetry so important? Posted: 15 Jan 2018 08:44 PM PST submitted by /u/skxllbo [link] [comments]

There's no such thing as a perfect vacuum. But what's the closest to a perfect vacuum in nature? In the least dense part of space, how far apart are two atoms? Posted: 15 Jan 2018 10:05 AM PST And could the area in between them be considered a "vacuum"? How large of an area do you have to have for a void of any matter to be considered a "vacuum"? submitted by /u/anonymous123421 [link] [comments]

Why do we sneeze, and what is happening during a sneeze? Posted: 15 Jan 2018 05:30 PM PST I'm couious about sneezing, why we sneeze, and how it works. submitted by /u/Stormtrooper-85 [link] [comments]

What determines the phasing of emitted photons? Posted: 15 Jan 2018 06:14 PM PST When EM radiation is emitted by a particle (as a result of electron energy transitions, ro-vibrational transitions, etc.), what determines the phasing of those emitted photons? I know that in the case of stimulated radiation the phasing of the new photon is the same as the incident photon, but what about spontaneous emissions? Background: Was reading about free electron lasers on Wikipedia and was confused by the following portion: This energy modulation evolves into electron density (current) modulations with a period of one optical wavelength. The electrons are thus longitudinally clumped into microbunches, separated by one optical wavelength along the axis. Whereas an undulator alone would cause the electrons to radiate independently (incoherently), the radiation emitted by the bunched electrons is in phase, and the fields add together coherently. I don't understand how having the electrons bunched up together in real space causes their emissions to all be in phase. submitted by /u/fleshwad [link] [comments]

Why is the maximum density of water achieved at 4°C, then becomes less dense until the freezing point? Posted: 15 Jan 2018 01:23 PM PST Someone explained this to me as to why lakes cycle and form ice on the top rather than the bottom of the lakes. It just doesn't make sense to me that liquid water can continue to get colder but will become less dense after crossing 4°C. submitted by /u/genghis_haun [link] [comments]

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Google, 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States

How can people sever entire legs and survive the blood loss, while other people bleed out from severing just one artery in their leg?

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• How can people sever entire legs and survive the blood loss, while other people bleed out from severing just one artery in their leg?
• Has nuclear testing during the 20th century contributed to climate change, and if so, to what extent?
• Why is it better for Lithium-ion batteries to be charged after a partial discharge and not a full discharge, unlike the Nickel-based batteries, which had a memory-effect that caused them to hold less charge if they got charged repeatedly after being only partially discharged not fully discharged?
• Have we discovered anything that can move faster than massless particles? If yes, what and how?
• Do the transitions between energy levels of an atom take time?
• Is there a 3D equivalent to the "Four Color Theorem"?
• In one thousand or one million or ten million years, would the nuclear age of mankind (1945+) be evident to geologists studying soil samples?
• Magnetic Flux relative to distance from a magnet?
• Would a perfectly ellipsoid balloon feel a different amount of internal pressure at its equator versus at its poles?
• How can radiation travel if radiation is from particles?
• Are our gas planets in our solar system almost a perfect sphere/ellipsoid?
• Can you use Lagrangian equations for non-conservative projectile motion?
• An electron has mass, so does a charged capacitor weight more than a discharged one?
• Why does photons have no mass?
• Is it possible to demonstrate the Casimir effect without expensive equipment?
• How does a resonance chamber work, like in a guitar?
• In what layer of the earth are convection currents and tectonic plates?
• Why don't stove top heating elements short circuit when you put a metal pan on them?
• How do Hydrogen isotopes become more stable?
• What are the neurochemical underpinnings of midlife crises?
• Simplest/most efficient refrigeration system?

How can people sever entire legs and survive the blood loss, while other people bleed out from severing just one artery in their leg? Posted: 14 Jan 2018 09:48 PM PST submitted by /u/throwaway53862 [link] [comments]

Has nuclear testing during the 20th century contributed to climate change, and if so, to what extent? Posted: 14 Jan 2018 09:45 PM PST submitted by /u/EnlightenedKidney [link] [comments]

Why is it better for Lithium-ion batteries to be charged after a partial discharge and not a full discharge, unlike the Nickel-based batteries, which had a memory-effect that caused them to hold less charge if they got charged repeatedly after being only partially discharged not fully discharged? Posted: 15 Jan 2018 01:49 AM PST According to battery experts , It's always better to charge lithium-ion batteries every time you could, and It's not recommended to wait for a full-discharge and then do a full-charge, unlike the Nickel-based batteries, Why is that? submitted by /u/Random-Noise [link] [comments]

Have we discovered anything that can move faster than massless particles? If yes, what and how? Posted: 15 Jan 2018 03:53 AM PST submitted by /u/schombat [link] [comments]

Do the transitions between energy levels of an atom take time? Posted: 15 Jan 2018 07:27 AM PST More specifically, in an X-Ray tube, during the process of creating the characteristic spectrum, could, as a place on the lowest energy level becomes vacant, a Kγ transition start to happen, only to be "interrupted" by another transition, say from the L to the K shell? So I guess there are two aspects to this question, Does it take time and can thus be interrupted? When are the photons released and could it happen that two photons that would correspond to transitions to the lowest energy levels are released "simultaneously"? submitted by /u/OrganicFlu [link] [comments]

Is there a 3D equivalent to the "Four Color Theorem"? Posted: 15 Jan 2018 03:12 AM PST I know the Four Color Theorem states that 4 colors are enough to fill any planar map. Is there a three-dimensional equivalent? Intuitively, I think it should need 42 colors, but is there a proof? Four Color Theorem submitted by /u/Uraniu [link] [comments]

In one thousand or one million or ten million years, would the nuclear age of mankind (1945+) be evident to geologists studying soil samples? Posted: 14 Jan 2018 08:49 AM PST submitted by /u/ExternalUserError [link] [comments]

Magnetic Flux relative to distance from a magnet? Posted: 14 Jan 2018 06:39 PM PST If you have a 5 Tesla magnet, how many Tesla would you have at a distance of .01 meters and how would you calculate this. Also how would the angle of the magnet normal affect this calculation. With a dipole would you simply multiply the original strength by the inverse cube of distance? ( 5T* [1/.01m3 ] ) submitted by /u/jager3339 [link] [comments]

Would a perfectly ellipsoid balloon feel a different amount of internal pressure at its equator versus at its poles? Posted: 14 Jan 2018 07:00 PM PST Im working on a physics project on my own and couldnt find anything helpful on the internet, so I decided to ask you guys for help. Assuming the balloon is a perfect rotational ellipsoid, would the gas inside exert a different amount of pressure at its equator versus at its poles? How could i calculate the pressure felt at some point a given percentage of the way between the equator and pole? submitted by /u/Drozengkeep [link] [comments]

How can radiation travel if radiation is from particles? Posted: 14 Jan 2018 07:15 PM PST Perhaps a stupid question, but in accidents like Fukushima Daiichi and Chernobyl, there is always talk about how the radiation spreads far from the site. How does this happen if radiation is the release of specific particles from atoms? I'm just starting to get into the different radioactive particles and don't have a very good grasp of the creation and distribution of radioactive particles from their original atoms. submitted by /u/EdgyCommunist [link] [comments]

Are our gas planets in our solar system almost a perfect sphere/ellipsoid? Posted: 14 Jan 2018 08:46 PM PST Or are there "bumps" in the atmosphere? submitted by /u/DiabloTerrorGF [link] [comments]

Can you use Lagrangian equations for non-conservative projectile motion? Posted: 14 Jan 2018 01:59 PM PST I posed this question to my math professor before the weekend, so I'm sure he will have an answer for me next lecture. However, I would like to know if I was on the right track with what I though my solution should be. For the question we are given an object that launches vertically upward at 160 m/s and undergoes only quadratic air drag with a drag coefficient of 0.0043 m-1. The drag coefficient is defined as (k/m). Now I've done the problem (which asks for time to max height, and distance travelled to max height, as well as total time for flight) using forces [ ma = -kv2 -mg (going up) , and ma = kv2 - mg (going down) ] but I was wondering if it would be possible to use Lagrangian equations to solve this. From what I understand I need a dissipating function to account for the energy lost because of the air drag, and I think I can use the Rayleigh dissipation function defined as, F = (1/2)k(dy/dt)2 Then when I put the dissipation function into my equation I would set the negative partial derivative of F with respect to the partial derivative of y(dot) equal to the Lagrange equation? At this point am I on the right track? Thank you in advanced, and sorry for my awful formatting. submitted by /u/Fourth_spatial [link] [comments]

An electron has mass, so does a charged capacitor weight more than a discharged one? Posted: 14 Jan 2018 05:40 PM PST submitted by /u/svenmullet [link] [comments]

Why does photons have no mass? Posted: 14 Jan 2018 04:16 PM PST Been looking at alot off stuff about photons, but have not found a good, easy and direct explanation for why they dont have any mass. submitted by /u/MoistSyphilis [link] [comments]

Is it possible to demonstrate the Casimir effect without expensive equipment? Posted: 15 Jan 2018 12:49 AM PST Hello, I'm curious if it's possible to demonstrate/measure the Casimir effect on a low budget with simple equipment. submitted by /u/bobhwantstoknow [link] [comments]

How does a resonance chamber work, like in a guitar? Posted: 14 Jan 2018 02:15 PM PST I understand that the string is connected to the bridge which vibrates the faceplate, but I don't understand whats going on inside the soundhole, in the body. Is it the size of the "chamber", meaning the size of the pocket of air, that determines it's resonance? How are the soundwaves coming out, not interfering with the ones going in? submitted by /u/ch1214ch [link] [comments]

In what layer of the earth are convection currents and tectonic plates? Posted: 14 Jan 2018 06:46 PM PST I have always found it confusing to visualize the convection currents, because while tectonic plates are always above, I've seen in some diagrams where they are located in the asthenosphere, the lithosphere, and the lower mantle. submitted by /u/BlindxWizard [link] [comments]

Why don't stove top heating elements short circuit when you put a metal pan on them? Posted: 14 Jan 2018 11:42 AM PST submitted by /u/madarmoredgiant [link] [comments]

How do Hydrogen isotopes become more stable? Posted: 15 Jan 2018 12:40 AM PST Just a question Id like some quick clarity on. Do they just lose neutrons exclusively? Why so? Thx 8) submitted by /u/TillyCreams [link] [comments]

What are the neurochemical underpinnings of midlife crises? Posted: 14 Jan 2018 01:07 PM PST Midlife crises / existential crises are intense psychological states which may have a huge impact of the well being of people, as they act upon impulsive decisions with poor impulse control, sometimes throwing away career, assets, family, friends. What do we know about what triggers them, and the neuro chemical cues and changes which accompany these life changing emotional crises? Bonus question: Are there ways to prevent them, or mitigate them? submitted by /u/Gargatua13013 [link] [comments]

Simplest/most efficient refrigeration system? Posted: 14 Jan 2018 08:46 PM PST A piece of wire across a 9v battery for example is technically 100% efficient at converting energy into heat. Is it possible to achieve this efficiency with refrigeration? What's the most efficient refrigeration system? Or at least theoretical refrigeration system? submitted by /u/NarrowPPHole [link] [comments]

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