Does heat, humidity, and other atmospheric variables affect wi-fi and other signals?

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• Does heat, humidity, and other atmospheric variables affect wi-fi and other signals?
• Are there equations that model how rivers change their course over time?
• What elastic moduli are strain dependent?
• Where does the Higgs boson gets its own mass?
• What do sexes in fungus mean?
• Where does the theoretical "two week" limit on weather forecasting skill come from?
• Do Most Comets Orbit in the Same Plane as the Planets?
• How different is our vision from the other apes?
• Does honey from different flowers taste different or do all bee "recipes" taste the same?
• Where does the "blast" portion of a nuclear explosion come from?
• Historically, when large numbers of sailboats/ships had to travel in formation as a fleet, are there different dynamics governing the movement of ships in the front, middle and rear of the group?
• How do female mosquitoes know humans have blood to suck?
• How do your eyes prevent shaking while you're walking?
• Does a volcanic eruption make another volcanic eruption more likely?
• Saw this strange cloud over Santa Cruz/tenerife today. Everyone was taking pictures. Can someone explain what is going on here? (does this type have a name?...)
• Do atmospheric CO2 measurements include a significant diurnal cycle?
• Are Toucans (Americas) and Hornbills (Asia/Africa) an example of convergent evolution?
• How do bionic arms work?
• Why do nuclei release energy when they fuse?
• Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science
• What are the estimated thicknesses for northern sea-ice at the height of the Pleistocene glaciation, and how are those thicknesses estimated?
• Why are non-differentiable continuous functions integrable?

Does heat, humidity, and other atmospheric variables affect wi-fi and other signals? Posted: 20 Sep 2017 07:36 PM PDT submitted by /u/PM_MATH_PROBLEMS [link] [comments]

Are there equations that model how rivers change their course over time? Posted: 21 Sep 2017 05:20 AM PDT I was looking at this picture, and it reminded me of the Kelvin–Helmholtz instability How accurate this idea? The KH-instability is only intended for use at the interface between two fluids, and the riverbed is solid. Are there good equations modeling how rivers change their course over time? submitted by /u/Baconmancr [link] [comments]

What elastic moduli are strain dependent? Posted: 21 Sep 2017 06:54 AM PDT Hi, I'll try and keep it brief; Which of the elastic moduli show a strong dependence on strain rate and magnitude? I know for a fact that the shear modulus does, do the bulk and young's modulus also? Some background to my question - I am working with both dynamic and static moduli at varying measurement frequency, and well aware of shear-modulus degradation with strain. But I was wondering about the others. If anyone can direct some reading my way that would be great; I have access to most journals and papers through my institution. Thanks submitted by /u/8556732 [link] [comments]

Where does the Higgs boson gets its own mass? Posted: 21 Sep 2017 03:11 AM PDT I was learning about the Higgs boson and read that it had mass but if everything got its mass from the Higgs boson and the Higgs field then how does a Higgs boson get mass? Does it self interact? Or does the Higgs Boson not have mass and can travel at light speed? submitted by /u/JackTalle [link] [comments]

What do sexes in fungus mean? Posted: 20 Sep 2017 12:43 PM PDT From the Wikipedia entry on Schizophyllum commune It has 23,328 distinct sexes; individuals of any sex are compatible for mating with all but their own sex. What does that mean? submitted by /u/Snewzie [link] [comments]

Where does the theoretical "two week" limit on weather forecasting skill come from? Posted: 21 Sep 2017 04:53 AM PDT I'm familiar with Lorenz' chaos paper and ensemble forecasting in general but I have yet to find a reference that actually calculates the oft repeated "two week" theoretical limit on weather forecasting. Does anyone know of the original reference? For context, here are the final paragraphs from Ed Lorenz' seminal chaos paper: This quasi-periodic behavior need not be established, though, even if very-long-range forecasting is feasible, if the variety of possible atmospheric states is so immense that analogues need never occur. It should be noted that these conclusions do not depend upon whether or not the atmosphere is deterministic. There remains the very important question as to how long is "very-long-range". Our results do not give the answer for the atmosphere; conceivably it could be a few days or a few centuries. In an idealized system, whether it be the simple convective model described here, or a complicated system designed to resemble the atmosphere as closely as possible [Such as weather forecasting models], the answer may be obtained by comparing pairs of numerical solutions having nearly identical initial conditions [Ensemble forecasting]. In the case of the real atmosphere, if all other methods fail, we can wait for an analogue [Cheeky]. submitted by /u/aClimateScientist [link] [comments]

Do Most Comets Orbit in the Same Plane as the Planets? Posted: 21 Sep 2017 08:18 AM PDT submitted by /u/ichegoya [link] [comments]

How different is our vision from the other apes? Posted: 21 Sep 2017 08:17 AM PDT submitted by /u/ifeellikemoses [link] [comments]

Does honey from different flowers taste different or do all bee "recipes" taste the same? Posted: 21 Sep 2017 08:12 AM PDT Similarly, do these differences affect pollen allergy sensitivity? submitted by /u/shutterlagged [link] [comments]

Where does the "blast" portion of a nuclear explosion come from? Posted: 20 Sep 2017 03:04 PM PDT In a chemical explosion, overpressure is generated by rapidly expanding gasses as the explosive reacts with Oxygen. I can see where the kinetic energy is produced there. In a nuclear explosion, it's a little bit fuzzier as to where the medium is getting the kinetic energy to produce a pressure wave. Is it coming from the expulsion of high-speed neutrons and fission products? Or is the radiation itself producing pressure from thermal expansion? submitted by /u/Rysander [link] [comments]

Historically, when large numbers of sailboats/ships had to travel in formation as a fleet, are there different dynamics governing the movement of ships in the front, middle and rear of the group? Posted: 20 Sep 2017 11:20 AM PDT I was wondering if large numbers of ships traveling together created issues for the ships behind them. Does wind change direction in between the boats of the fleet? Are there currents created by the front of the fleet that can cause problems for the rest of the fleet? Does that translate to larger ships today, like the ships the navy uses? submitted by /u/scrubbingbubble [link] [comments]

How do female mosquitoes know humans have blood to suck? Posted: 21 Sep 2017 04:42 AM PDT submitted by /u/Trivial-Savoir-Faire [link] [comments]

How do your eyes prevent shaking while you're walking? Posted: 20 Sep 2017 05:49 PM PDT I've paid close attention to how some camera's now use OIS, or optical image stabilization, and EIS, or Electronic image stabilization and I was wondering why my vision isn't shaking while I'm walking. Is it some physical thing near my eyes stabilizing what I see or is that handled by the brain? submitted by /u/wisconsinb5 [link] [comments]

Does a volcanic eruption make another volcanic eruption more likely? Posted: 20 Sep 2017 01:48 PM PDT Clarification: Another eruption from a different volcano. submitted by /u/re_nonsequiturs [link] [comments]

Saw this strange cloud over Santa Cruz/tenerife today. Everyone was taking pictures. Can someone explain what is going on here? (does this type have a name?...) Posted: 20 Sep 2017 06:42 PM PDT Here is a picture. We strolled through the city and everywhere were people taking pictures of it. Clpud https://imgur.com/gallery/09tbN submitted by /u/farox [link] [comments]

Do atmospheric CO2 measurements include a significant diurnal cycle? Posted: 20 Sep 2017 11:58 AM PDT I know the annual cycle is obvious in CO2 concentrations. Is a diurnal cycle often visible either locally or globally? Also, what (roughly) is the mixing time scale for CO2 over the whole atmosphere? submitted by /u/descabezado [link] [comments]

Are Toucans (Americas) and Hornbills (Asia/Africa) an example of convergent evolution? Posted: 20 Sep 2017 09:53 AM PDT Indian Hornbill Toucan Both eat fruit/insects in various amounts depending on the species. Figs, etc. submitted by /u/sobeadrenalinerush [link] [comments]

How do bionic arms work? Posted: 20 Sep 2017 10:11 AM PDT My understanding is people can control bionic arms the same way they control regular arms: through volition and transmitting neurological signals to various locations in the body. Where and how do bionic arms interface with the body? Do they read neurological signals directly? How? submitted by /u/_Clever_Name_Here_ [link] [comments]

Why do nuclei release energy when they fuse? Posted: 20 Sep 2017 11:16 AM PDT I understand that the binding energy increases, but this doesn't make sense to me. You need a lot of energy to break a small nucleus into its constituents to overcome the strong force, but why would "submitting" to the strong force and attracting cause energy to be released? Is this some sort of potential energy? (Like how work is needed to overcome gravity, but if an object "submits" to gravity and falls it releases its potential energy) Is it the case with all forces that when something submits to a force it releases its potential energy like that? submitted by /u/Ambidextroid [link] [comments]

Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science Posted: 20 Sep 2017 08:07 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Physics, Astronomy, Earth and Planetary 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]

What are the estimated thicknesses for northern sea-ice at the height of the Pleistocene glaciation, and how are those thicknesses estimated? Posted: 20 Sep 2017 12:48 PM PDT I get how these estimates are calculated on land, on the basis of isostatic rebound notably. But how do we work that out over sea? submitted by /u/Gargatua13013 [link] [comments]

Why are non-differentiable continuous functions integrable? Posted: 20 Sep 2017 09:18 AM PDT We learnt that a |mod| function is continuous yet non-differentiable and as integrals are defined as "anti-derivatives" sooo how come we can integrate a mod function yet we can't differentiate it? submitted by /u/Ishjot11 [link] [comments]

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Earthquake Megathread

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• Earthquake Megathread
• If a nuclear bomb went off in Boston harbor could scientists tell after the fact who had manufactured it, do they leave distinct radioactive signatures?
• Do black holes have electromagnetic field?
• How many layers are there in a modern integrated circuit?
• Do people that have degenerative diseases such as Alzheimer's lose their muscle memory as well?
• How is it possible that something as large as a possible Planet 9 has completely evaded visual observation?
• How did they measure hurricane wind speeds in the 1800's?
• Why does the Earth's rotation effect Rockets and not Planes?
• What is happening at a molecular level when a knife cuts through nylon rope?
• How is it that scissors can curl ribbons?
• Would global cooling create more land? If so, how much more land would be available before the whole earth freezes?
• Why is caesium the largest atom? Shouldn't element 118 be the largest?
• Does my peripheral vision have a different latency than objects I look directly at?
• [CHEMISTRY] How do chemical companies determine if one ingredient in a solution can be replaced by another?
• Do snakes that can 'see' heat, such as ball pythons, compare their 'heat vision' with their normal vision?
• What defines an equation of state?
• Can a human be allergic to any substance? As in, does every material have the potential to elicit an allergic response?
• Why is gold found in seams?
• On an alien planet, would a regular compass still point true north?
• In emergencies like on CDMX will using cellphone data on a very far state affect the capacity on CDMX cell towers to make calls and/or use cell phone data?
• Can someone with reading Aphasia "read" in Braille?

Earthquake Megathread Posted: 19 Sep 2017 01:19 PM PDT Hi everyone! Unfortunately, there have been recent reports of another earthquake in Mexico, a magntiude 7.1 centered about 100 miles from Mexico City. We had a previous megathread discussing the last earthquake (magnitude 8.1) off the coast less than two weeks ago. If you've got more questions about earthquakes, feel free to ask those here! Panel members will be in and out throughout the day so please do not expect an immediate answer. Again, for hurricane questions, please direct them to our hurricane megathread instead. Useful links: USGS Report NY Times - "Powerful Earthquake Strikes Mexico" BBC - "Mexico: Strong quake strikes, collapsing buildings" Reuters - "Strong 7.1 quake hits Mexico, people trapped in collapsed buildings" submitted by /u/AskScienceModerator [link] [comments]

If a nuclear bomb went off in Boston harbor could scientists tell after the fact who had manufactured it, do they leave distinct radioactive signatures? Posted: 19 Sep 2017 11:59 PM PDT Asking for a friend submitted by /u/plato1123 [link] [comments]

Do black holes have electromagnetic field? Posted: 19 Sep 2017 11:44 PM PDT I read that black holes have three properties mass, spin, and charge. But if they have charge, then thet have an electromagnetic field. But then electromagnetic fields are described that carried by virtual photons. But nothing can leave a black hole event horizon, not even photons. What am I missing? submitted by /u/gibizer [link] [comments]

How many layers are there in a modern integrated circuit? Posted: 20 Sep 2017 12:48 AM PDT I'm getting how the raster dictates density of elements in IC in the horizontal plane over the wafer. But as I understand, there's the third dimension - so far mostly untapped because of heat dissipation necessity; the bit of wafer in a CPU is a rather flat square, not a cube. Still, if my understanding is correct, there's more than a single layer of the components on the wafer, they are stacked to a degree. How many layers though? And how thick such a layer is? submitted by /u/sharfpang [link] [comments]

Do people that have degenerative diseases such as Alzheimer's lose their muscle memory as well? Posted: 19 Sep 2017 02:34 PM PDT submitted by /u/Old__lamp [link] [comments]

How is it possible that something as large as a possible Planet 9 has completely evaded visual observation? Posted: 19 Sep 2017 07:17 PM PDT I've heard that if there actually is a Planet 9, it's more than 10x the size of Earth. I understand that Planet 9 is extremely far away, but it seems that something that large could not avoid being seen for so long. How can it be that all of Earth's astronomers have missed it for so long? submitted by /u/lonewanderer44 [link] [comments]

How did they measure hurricane wind speeds in the 1800's? Posted: 19 Sep 2017 06:12 PM PDT Saw a post on facebook indicating the history of cat 5 hurricanes, and was curious how they measured wind speed as far back as 1850. Also, should I cross post this to r/AskHistorians? submitted by /u/coolscreenname [link] [comments]

Why does the Earth's rotation effect Rockets and not Planes? Posted: 20 Sep 2017 06:10 AM PDT Most rockets are launched into a prograde orbit as it's more efficient to do so with the earth's rotation. If I were to fly around the equator the planes their relative velocity would just be it's speed because it's already traveling at the speed of the earth's rotation before take off. Not matter what direction due to the reference frame or say a person on the ground both would appear at going the same speed just in alternate directions. (Assuming no other influence the efficiency will be the same). If I were to launch a rockets at the equator from the same locations into an orbit one with the rotation and one against it why then do we need to think about the earth's rotation for efficiency? Probably something simple but I can't get my head around it, hope you understand what I'm asking. Thanks. submitted by /u/RandomQuestion567 [link] [comments]

What is happening at a molecular level when a knife cuts through nylon rope? Posted: 19 Sep 2017 03:14 PM PDT submitted by /u/YorkHenderson [link] [comments]

How is it that scissors can curl ribbons? Posted: 19 Sep 2017 05:51 PM PDT Everytime I wrap a gift, I always ended it with the ribbon,on the gift (or box) being curled. I wondered how that happens. submitted by /u/TheMainEngy [link] [comments]

Would global cooling create more land? If so, how much more land would be available before the whole earth freezes? Posted: 19 Sep 2017 10:05 PM PDT My hypothesis is based on the reverse of the polar ice caps melting. If there was a global cooling, then I imagine the polar ice caps would grow in size (more water freezes) and the ocean level would get lower, baring more land. submitted by /u/_goodboy [link] [comments]

Why is caesium the largest atom? Shouldn't element 118 be the largest? Posted: 19 Sep 2017 01:55 PM PDT submitted by /u/SomeGuyYouKnow_ [link] [comments]

Does my peripheral vision have a different latency than objects I look directly at? Posted: 19 Sep 2017 04:28 PM PDT For example. I have a timer counting down from 60. The timer is displayed in two spots on the left and the right. If I watch the timer on the right directly and the timer on my left is in my peripheral vision, do I see the timer on the left update after the timer on the right? Or do I see them update at the same time? Is this a real latency or a perceived latency? submitted by /u/_Guinness [link] [comments]

[CHEMISTRY] How do chemical companies determine if one ingredient in a solution can be replaced by another? Posted: 19 Sep 2017 09:22 AM PDT If two chemicals aren't the same, how would a company determine if something is a good replacement? submitted by /u/ClevalandFanSadface [link] [comments]

Do snakes that can 'see' heat, such as ball pythons, compare their 'heat vision' with their normal vision? Posted: 19 Sep 2017 06:22 PM PDT I have a pet ball python, and I've been wondering this for a while. Basically, do pythons identify, with their normal vision, the source of the heat? The process I am imagining is just like the way humans compare their hearing to their sight, in order to identify the source of the noise. Am I correct at all, or do they interpret the senses completely differently? submitted by /u/derekthesnake [link] [comments]

What defines an equation of state? Posted: 19 Sep 2017 07:54 PM PDT I'm taking a thermodynamics course and learning about State Functions and Equations but am confused by some of the finer details. For example I can see online that enthalpy has an equation dH(S,P)= TdS + VdP. Is this considered an equation of state, or are the relations (dH/dS)p=T and (dH/dP)s=T the equations of state? Most publications I can find seem to use equations of state as a stepping stone for Maxwell equation or other derivations and don't spend any time specifically defining what equations of state are. submitted by /u/Meto1183 [link] [comments]

Can a human be allergic to any substance? As in, does every material have the potential to elicit an allergic response? Posted: 19 Sep 2017 10:51 AM PDT submitted by /u/QuinneAgain [link] [comments]

Why is gold found in seams? Posted: 19 Sep 2017 07:35 AM PDT I know that heavier elements basically form during supernovas, and I think the heaviest element a star like our sun will produce would be iron. So, the gold and all of the other heavy elements explode in an incredible display of violence, across the galaxy. Then we fast forward on to present day, and a bunch of the gold on earth has collected into a "seam". What's the geological process for this? And are we just incredibly lucky to have reasonably significant amounts of most naturally occuring elements? submitted by /u/Serendiplodocus [link] [comments]

On an alien planet, would a regular compass still point true north? Posted: 19 Sep 2017 07:33 AM PDT On Earth, "magnetic north" (the direction that compasses point) and one of the Earth's axes ("true north") happen to be in approximately the same place. This seams too neat and clean to be a coincidence, so would the same thing happen on an average alien planet with a magnetic field? Are magnetic poles 'drawn' to the axes of a planet, or is that just coincidence? submitted by /u/sixcubit [link] [comments]

In emergencies like on CDMX will using cellphone data on a very far state affect the capacity on CDMX cell towers to make calls and/or use cell phone data? Posted: 19 Sep 2017 08:56 PM PDT submitted by /u/DoctorWamytt [link] [comments]

Can someone with reading Aphasia "read" in Braille? Posted: 19 Sep 2017 08:26 AM PDT So in class, my psych teacher was explaining how damage to the Angular Gyrus leads to aphasia, specifically Aphasia where you can't read properly. I was wondering if this also extends to and affects Braille. submitted by /u/Kufu1796 [link] [comments]

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

There is a video on the Front Page about the Navy's Railgun being developed. What kind of energy, damage would these sort of rounds do?

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• There is a video on the Front Page about the Navy's Railgun being developed. What kind of energy, damage would these sort of rounds do?
• In 1972 a woman fell 33,332 feet without dying. How is that possible?
• Could we railgun the Moon?
• In physics, why is the formula to calculate force F=ma instead of F=mv (mass x velocity)?
• How is online gaming possible if there must be some delay?
• How do rainbows that curve away from the sun work?
• Why aren't there any orbitals after s, p, d and f?
• What is the Theoretical Limit on the Energy Density of Ultracapacitors?
• When I tear open plastic packaging (like a bag of chips or any type of plastic packaging) , are chemical bonds being broken? What is happening on the molecular level during the tearing?
• How accurate is it theoretically possible for weather forecasting to be? For example, with a powerful enough supercomputer, will we eventually be able to predict the exact track of a hurricane weeks in advance? Are there any other factors limiting prediction accuracy aside from computing power?
• Why Does Distilled Water Evaporating Slower Than Tap Water?
• For a reaction with a given reaction mechanism, is the activation energy a constant?
• What is gravity like at the center of the Earth?
• What Does Sagittarius A* Look Like?
• Do the radioactive elements in nuclear weapons emit detectable radiation?
• Does the heating of the earths surface during summer months affect plate tectonics?
• Since the surface of the Sun is only ~14 times hotter than my oven when I'm baking a pizza, why am I able to feel the Sun's heat from 93 million miles away?
• Iron Man's arc reactor could theoretically work by using Palladium isotopes, how much energy could this produce and how difficult would it be to make?
• What causes the smoke cloud around a railgun's barrel if it doesn't use gunpowder or explosive propellant?
• What is the speed difference between the different mass state components of neutrinos in flight?
• No-slip condition with a draining pipe?
• Why do lots of Viruses (Ebola, Bubonic Plague etc) present with Flu like symptoms? How can someone tell the difference?

There is a video on the Front Page about the Navy's Railgun being developed. What kind of energy, damage would these sort of rounds do? Posted: 18 Sep 2017 10:25 AM PDT https://www.reddit.com/r/videos/comments/70u6sy/the_us_navy_has_successfully_tested_the_first/ http://breakingdefense.com/2017/05/navy-railgun-ramps-up-in-test-shots/ "Consider 35 pounds of metal moving at Mach 5.8. Ten shots per minute" What kind of damage would these do? Would the kinetic energy cause an explosion? For that type of projectile what would a current type of TNT/Weapon be in damage potential? submitted by /u/irrelevant_query [link] [comments]

In 1972 a woman fell 33,332 feet without dying. How is that possible? Posted: 18 Sep 2017 10:58 AM PDT submitted by /u/loggydawg [link] [comments]

Could we railgun the Moon? Posted: 19 Sep 2017 01:59 AM PDT Is the reach of the US Navy railgun long enough to reach the Moon? submitted by /u/Borsippian [link] [comments]

In physics, why is the formula to calculate force F=ma instead of F=mv (mass x velocity)? Posted: 18 Sep 2017 09:47 PM PDT For example, if a car that weighs 2 kilograms his traveling at a constant speed of 31 meters a second as the car hits you. It would give you a fair amount of force right? But the formula states that since the car is not accelerating and is at a constant speed, a=0, since 2,000 x 0 = 0 the formula says that the car hits you with a force of 0 newtons (which I don't think is accurate) Even if the car started at 0 m/s and started to accelerate at 2m/s/s wouldn't the calculations still be wrong and have an incorrect amount of force calculated? submitted by /u/kool_kolumbine_kid [link] [comments]

How is online gaming possible if there must be some delay? Posted: 19 Sep 2017 02:26 AM PDT Online communication always has a delay, especially when people communicating are on opposite sides of the US. If that's the case, then how are fast FPS video games, like Call of Duty, possible to play online? submitted by /u/Master_Vicen [link] [comments]

How do rainbows that curve away from the sun work? Posted: 18 Sep 2017 09:52 AM PDT As I walked to work today I saw a iridescent cloud above, and it wasn't just that but a full rainbow (or two if you look closely enough). After some walking I notice that the rainbow curved away from the sun, and was not centered around it (as seen in the image). Normal rainbows result from by water-droplets acting like a really bad lens/mirror and sending a chromatic aberration at the observer. No matter if it's mirror or lens, it's always centered around the sun (or without clear curve in the case of iridescent clouds). Yet I don't know how these work, as they're clearly curved, and that away from the sun. submitted by /u/GregTheMad [link] [comments]

Why aren't there any orbitals after s, p, d and f? Posted: 19 Sep 2017 07:29 AM PDT After Element 60 I noticed that there weren't any new orbitals anymore, there were just "more of the others". Why is that? Anything to do with energylevels? submitted by /u/wolfgertripathi [link] [comments]

What is the Theoretical Limit on the Energy Density of Ultracapacitors? Posted: 19 Sep 2017 02:48 AM PDT For example the specific energy of uranium 235 is about 700k MJ/kg, and supercapacitors top out at 30 MJ/kg. What would be the theoretical limit for the ultracapacitors that are being researched today? I've heard several orders of magnitude so I'd guess that means 3k+ MJ/kg. What's the maximum theoretical limit for specific energy for a capacitor with known laws of physics? What formulas are used to determine the theoretical limits here? submitted by /u/Radiatin [link] [comments]

When I tear open plastic packaging (like a bag of chips or any type of plastic packaging) , are chemical bonds being broken? What is happening on the molecular level during the tearing? Posted: 18 Sep 2017 01:35 PM PDT submitted by /u/bparkerson04 [link] [comments]

How accurate is it theoretically possible for weather forecasting to be? For example, with a powerful enough supercomputer, will we eventually be able to predict the exact track of a hurricane weeks in advance? Are there any other factors limiting prediction accuracy aside from computing power? Posted: 18 Sep 2017 01:28 PM PDT submitted by /u/poozemusings [link] [comments]

Why Does Distilled Water Evaporating Slower Than Tap Water? Posted: 18 Sep 2017 11:39 AM PDT Sorry if this has been asked before, I searched around didn't see anything but assumed this would've come up before. Anyways, so my wife uses distilled water to clean baby bottles and stuff like that in one of those steamers. Well she pointed out to me the other day that, when she sets the bottle down on the drying rack, the little droplets of distilled water don't evaporate very quickly. They'll sit there for a few days without evaporating she said. I didn't really believe her so we did an experiment where we had identical bottles. Both cleaned with distilled water in the steamer but we rinsed one with tap water, then set them both in the same position next to each other on the drying rack. By the evening, the tap-water-rinsed bottle was completely dry but the distilled only bottle was still covered with those droplets on the inside. What's going on here? submitted by /u/Throwaway----4 [link] [comments]

For a reaction with a given reaction mechanism, is the activation energy a constant? Posted: 18 Sep 2017 10:59 AM PDT I know that catalysts use a different reaction mechanism with a lower activation energy, but for a given mechanism, does the activation energy change with respect to temperature, pressure, or reactant concentration? submitted by /u/vitcaffeine [link] [comments]

What is gravity like at the center of the Earth? Posted: 18 Sep 2017 11:59 AM PDT So say you were able to reach the center of the Earth, what would gravity be like? Would there be a sense of getting pulled in a direction (down?), or would you be weightless like in space? submitted by /u/GoodGuyPolarBear [link] [comments]

What Does Sagittarius A* Look Like? Posted: 18 Sep 2017 09:32 AM PDT Suppose we were able to exist at a safe distance from Sagittarius A*. Perhaps we are in Carl Sagan's Ship of the Imagination. What would we see? What about various distances? Do the stars that orbit it move fast enough for us to see with the naked eye? Is there visible matter surrounding it? What would such a hole in space even look like? How would it bend light and spaetime? Etc... etc... etc... I am an author writing a story about a man who has visions of Sagittarius A* and I want his visions to be accurate despite the fact that he is insane. submitted by /u/JoshuaGoudreau [link] [comments]

Do the radioactive elements in nuclear weapons emit detectable radiation? Posted: 18 Sep 2017 03:35 PM PDT I am curious to know whether nuclear weapons emit detectable radiation at any stage of their lifecycle. For the sake of argument, let's say we are considering a thermonuclear hydrogen bomb, but if someone feels like sharing any expertise on fission weapons too, great. Intuitively, I'd think that there would have to be a certain amount of radiation released during construction of these weapons just by passive decay of any uranium or plutonium involved in the construction...but what about after they are completed? Do they emit radiation during transport, storage, and/or once in-flight towards a target? How would such radiation be mitigated - lead-shielded transport containers, perhaps? Is there any hope of us ever developing some kind of "early warning system" to detect such radiation that would allow us to say, "That missile/bomb/etc. that is on a ballistic trajectory is/is not armed with a nuclear warhead" - ? Thank you in advance to anyone who cares to comment. submitted by /u/RaspersProgress [link] [comments]

Does the heating of the earths surface during summer months affect plate tectonics? Posted: 18 Sep 2017 06:23 PM PDT Is there more or less movement in summer months due to the surface expanding with heat. Or the opposite with shrinking during the colder months? submitted by /u/Delittle3 [link] [comments]

Since the surface of the Sun is only ~14 times hotter than my oven when I'm baking a pizza, why am I able to feel the Sun's heat from 93 million miles away? Posted: 18 Sep 2017 02:01 PM PDT submitted by /u/DownvoteIfYoureHorny [link] [comments]

Iron Man's arc reactor could theoretically work by using Palladium isotopes, how much energy could this produce and how difficult would it be to make? Posted: 18 Sep 2017 05:40 PM PDT I recently re-watched iron man after having only seen it at an fairly young age. And realized that the arc reactor uses palladium, which I was fairly certain was radioactive, after some research because why not I found this article, which states that one of the most plausible methods for Iron mans arc reactor to operate is by utilizing the electron capture of Palladium-103 and beta decay of Palladium-107 as a circuit, my main questions are: A, does this work? B, How much power would this produce? C, what is humanity missing to make this if anything? submitted by /u/AlexStorm1337 [link] [comments]

What causes the smoke cloud around a railgun's barrel if it doesn't use gunpowder or explosive propellant? Posted: 18 Sep 2017 06:49 AM PDT https://www.youtube.com/watch?time_continue=93&v=QO_zXuOQy6A Saw this video on another sub and noticed the plume of smoke. Another video indicated that this was molten iron, but I'm not sure how that would turn into a cloud rather than clumps of glowing metal. submitted by /u/Duke_Paul [link] [comments]

What is the speed difference between the different mass state components of neutrinos in flight? Posted: 18 Sep 2017 04:46 PM PDT According to wikipedia, "Neutrinos oscillate between different flavors in flight. For example, an electron neutrino produced in a beta decay reaction may interact in a distant detector as a muon or tau neutrino. This oscillation occurs because the three mass state components of the produced flavor travel at slightly different speeds, so that their quantum mechanical wave packets develop relative phase shifts that change how they combine to produce a varying superposition of three flavors." So when they say there is a small difference in speed between the different components of flavor, do they mean like a number really close to 0 is the difference in speed, or a larger number? submitted by /u/iadd [link] [comments]

No-slip condition with a draining pipe? Posted: 18 Sep 2017 04:47 PM PDT So for a cylinder with fluid moving through it I can see how the math works out for the no slip condition, but how does that work in scenarios where A. the cylinder isn't completely filled to the top, and B. where it's draining to the point of being empty? Particularly for B., if the no slip condition requires no velocity at the surface boundary, how can I do something as ordinary as completely emptying a cup of water I've tipped on its side to drink from it? submitted by /u/Khenghis_Ghan [link] [comments]

Why do lots of Viruses (Ebola, Bubonic Plague etc) present with Flu like symptoms? How can someone tell the difference? Posted: 18 Sep 2017 12:53 PM PDT submitted by /u/PusheenIsMyHomegirl [link] [comments]

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