If you watch a gif of a coin flipping (without ever seeing it) to make a decision, is it still a 50/50 chance, even though the video already predetermines what side the coin will flip onto?

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• If you watch a gif of a coin flipping (without ever seeing it) to make a decision, is it still a 50/50 chance, even though the video already predetermines what side the coin will flip onto?
• Were the supermassive blackholes at the center of galaxies supermassive stars at one point?
• As bananas emit small amounts of gamma radiation, would it be theoretically possible to get radiation sickness/poisoning in a room completely full of them?
• Can any of Maxwell's equations be deduced from the others?
• Why do opposite charges attract and like charges repel?
• What differentiates simple and complex covalent compounds?
• Why are the northern lights so bright right now?
• How can we know the Sun's surface temperature when the Sun's corona around it is hundreds of times hotter?
• Why do we need to continually consume protein?
• Excluding environmental factors, what determines the life expectancy for a species?
• How do lysosomes in phagocytes know only to attach to *food vacuoles*, and not simply affix themselves to the interior of the cell and eat that?
• How are routers capable of handling multiple devices at once on the same wifi network? Wouldn't there be some kind interference between all of the devices?
• Have/Will Mercury and Venus ever transit the Sun at the same time?
• When packet loss occurs, are the packets truly being "lost", or are they simply fading into the background? (Computing)
• Does a polyhistidine tag alter the folded structure of proteins?

If you watch a gif of a coin flipping (without ever seeing it) to make a decision, is it still a 50/50 chance, even though the video already predetermines what side the coin will flip onto? Posted: 08 Oct 2016 12:23 PM PDT submitted by /u/OatmealWarrior [link] [comments]

Were the supermassive blackholes at the center of galaxies supermassive stars at one point? Posted: 08 Oct 2016 02:20 PM PDT submitted by /u/DresdenPI [link] [comments]

As bananas emit small amounts of gamma radiation, would it be theoretically possible to get radiation sickness/poisoning in a room completely full of them? Posted: 09 Oct 2016 05:35 AM PDT submitted by /u/ShadowHandler [link] [comments]

Can any of Maxwell's equations be deduced from the others? Posted: 09 Oct 2016 05:33 AM PDT I've gotten my head around Maxwell's equation but I'm still unsure about whether the magnetic and electric field are by nature two different things. Can any of Maxwell's equations be deduced from the others? Or are they all rooted in empirical observation? submitted by /u/ohmtastic [link] [comments]

Why do opposite charges attract and like charges repel? Posted: 09 Oct 2016 12:58 AM PDT And by opposite charges, I mean electrons and protons, or the North/South pole of a magnet. Is this phenomenon simply a property of matter, or is there an underlying reason as to why this is? submitted by /u/Fruit-Dealer [link] [comments]

What differentiates simple and complex covalent compounds? Posted: 09 Oct 2016 05:06 AM PDT I.e. why is CO2 a weak covalent compound but diamond a strong one? submitted by /u/Thecactusslayer [link] [comments]

Why are the northern lights so bright right now? Posted: 09 Oct 2016 04:16 AM PDT I remember reading a while ago that the lights would be especially bright. Is it something to do with our atmosphere or is the sun unusually strong at the present time? submitted by /u/HaxorSlice1 [link] [comments]

How can we know the Sun's surface temperature when the Sun's corona around it is hundreds of times hotter? Posted: 09 Oct 2016 07:48 AM PDT I read today about the fact that the Sun's corona is hundreds of times hotter than the photosphere (surface) of the Sun. The photosphere measures around 6000 K, goes over 20,000 K in the chromosphere and way over 1 million K in the Sun's corona. As I was glad to learn something new, my little science brain started thinking about how we can possibly measure 'lower' temperatures that's surrounded by such extreme high temperatures? The problem I'm visualizing, is like measuring the heat of a warm coffeecup that is hidden behind a larger, hotter campfire (or something hotter). Maybe a bad analogy, but I'm curious about the temperature measurement techniques used if it's explainable in ELI5 format :) submitted by /u/gunnar_osk [link] [comments]

Why do we need to continually consume protein? Posted: 08 Oct 2016 10:25 PM PDT Isn't protein used to build molecular structures using the amino acids? Why don't our bodies just recycle the ones we have if we aren't growing or trying to bulk up? submitted by /u/DippyTheDinosaur [link] [comments]

Excluding environmental factors, what determines the life expectancy for a species? Posted: 08 Oct 2016 07:57 PM PDT submitted by /u/limeburst2 [link] [comments]

How do lysosomes in phagocytes know only to attach to *food vacuoles*, and not simply affix themselves to the interior of the cell and eat that? Posted: 08 Oct 2016 03:11 PM PDT I assume the new vacuole is created with a phospholipid bilayer analogous (if not identical) to the cell membrane that was just used to eat whatever was engulfed. Is it simply the hydrophobic nature of the outside of the vacuole that draws the lysosome over like some sexy hooker and is like "hey stud. you look like you're pretty hungry. why don't you come over here and take a bite outta this ass?" ^ (pretty sure that's how it happens scientifically.) submitted by /u/Ungodlydemon [link] [comments]

How are routers capable of handling multiple devices at once on the same wifi network? Wouldn't there be some kind interference between all of the devices? Posted: 08 Oct 2016 11:50 AM PDT submitted by /u/ImTristan [link] [comments]

Have/Will Mercury and Venus ever transit the Sun at the same time? Posted: 08 Oct 2016 06:30 PM PDT It would be pretty cool to see... submitted by /u/DerposaurPlays [link] [comments]

When packet loss occurs, are the packets truly being "lost", or are they simply fading into the background? (Computing) Posted: 08 Oct 2016 09:09 AM PDT My father and I are having a discussion about packet loss in computers. We're essentially arguing about semantics. When packet loss occurs (assuming no mal-intent by others), is the packet not arriving at it's destination, or is it arriving but at such a low signal that the receiver cannot distinguish it from noise? submitted by /u/Iced_Bacon [link] [comments]

Does a polyhistidine tag alter the folded structure of proteins? Posted: 08 Oct 2016 03:11 PM PDT From what I understand, the function of a protein generally relies on its folded structure. It seems like adding a poly-His tag is a common way of separating out a synthesized protein from the rest of the natural proteins, after which the poly-His is cut off enzymatically. Do most proteins have only one stable folding pattern, which they fall into when the tag is cut, or is it often the case that the resulting protein is now misfolded? If so, is there some way of ensuring the folded structure is actually the same as the normal folded structure? Is there a collection of proteins for which the poly-His approach does not work, because the tag alters the shape of the protein? The question really comes from a fundamental question about proteins: do most proteins have a single, stable structure (in water, at physiological pH), or are there frequently multiple stable structures? Techniques like poly-His tags seem to suggest that it is the former, while discussions of protein function (eg prions, bohr effect in hemoglobin) seem to rely on the latter. submitted by /u/hansn [link] [comments]

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Should the presence of a heart stent affect the way CPR is performed?

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• Should the presence of a heart stent affect the way CPR is performed?
• If you take a DNA sample from a newborn, would it match a DNA sample from when the same person is 80?
• Lightning produces ozone. Many ionizing air purifiers also produce ozone. Does an electric current exposed to air always produce ozone?
• What is the difference between axial tilt and axial precession?
• If a huge and dense enough amount of coherent light was emitted, would it create a black hole traveling at the speed of light?
• How did scientists discover the maximum G-limits of humans?
• Why does cellular regeneration degrade as an organism ages?
• Does the use of female birth control alter when women go through menopause?
• If factoring numbers with ~1000 digits is so difficult that it is used in encryption, how do we know of primes with many millions of digits?
• Why does wet rubber squeak when rubbed?
• How do calculators evaluate the zeroes of polynomials? Does it depend on the nature of the polynomial?
• If we find life on Mars, how will we know it didn't come from tiny organisms on any of the rovers?
• Is the role of pressure vs. concentration gradient for gas solutions the same as it is for liquid solutions?
• Why does my face turn red during strenuous activity instead of the body part(s) I'm using?
• How does Asymetric Encryption actually work?
• Does a massless particle traveling through a medium experience the passage of time?
• How do modern game clients allow you to play a game before its finished downloading?
• If HIV was wiped out could it ever come back again?
• Do we know where the matter that created the sun came from? Is our solar system the rebirth of a previous star, or one of the original stars from the Big bang?
• What are some strange things that happen under EXTREME magnetic fields?
• Can radar be used to track small moving objects like basketballs?
• A planet sized ball of water - what would happen?
• In most pictures of planets why are there no stars in the background?

Should the presence of a heart stent affect the way CPR is performed? Posted: 07 Oct 2016 09:17 PM PDT Should the presence of a heart stent (ie Contegra Heterograft) affect the way CPR is performed? If so, how and why? Are there any risks/negative consequences of performing standard CPR on someone with a heart stent? submitted by /u/IlvaPie [link] [comments]

If you take a DNA sample from a newborn, would it match a DNA sample from when the same person is 80? Posted: 07 Oct 2016 05:44 PM PDT submitted by /u/phillipa2 [link] [comments]

Lightning produces ozone. Many ionizing air purifiers also produce ozone. Does an electric current exposed to air always produce ozone? Posted: 07 Oct 2016 07:56 PM PDT Does this mean that those open coil electric heaters are bad for people with asthma? How do ionizing air purifiers generate ions? submitted by /u/mistatroll [link] [comments]

What is the difference between axial tilt and axial precession? Posted: 08 Oct 2016 03:22 AM PDT In relation to the Earth. submitted by /u/thatfridayshow [link] [comments]

If a huge and dense enough amount of coherent light was emitted, would it create a black hole traveling at the speed of light? Posted: 08 Oct 2016 02:46 AM PDT Would the event horizon only cover the leading edge, not the trailing edge? submitted by /u/AbruptlyPuffing [link] [comments]

How did scientists discover the maximum G-limits of humans? Posted: 07 Oct 2016 09:11 PM PDT Did they just keep testing humans or animals to figure out the limits? submitted by /u/bbbook [link] [comments]

Why does cellular regeneration degrade as an organism ages? Posted: 08 Oct 2016 05:18 AM PDT Bonus question: Why do cold-blooded creatures tend to have longer lifespans than warm-blooded creatures? submitted by /u/Therandomfox [link] [comments]

Does the use of female birth control alter when women go through menopause? Posted: 08 Oct 2016 07:41 AM PDT Traditional female birth control "the pill" works by not releasing an egg correct? And women have a fixed number of eggs that are released before they go through menopause so does long periods of time on birth control delay the onset of menopause? Feel free to correct any mistakes I've made here. submitted by /u/Swag__Lord69 [link] [comments]

If factoring numbers with ~1000 digits is so difficult that it is used in encryption, how do we know of primes with many millions of digits? Posted: 07 Oct 2016 12:15 PM PDT I know that certain cryptographic systems use large prime factorizations as their encryption method because it takes a long time to factor large numbers, and using numbers with 1000+ digits produces an encryption that is nigh-unbreakable with current technology. So how is it that the largest known prime has over 20 million digits and we know of many prime numbers with millions of digits, if factoring numbers is so difficult? submitted by /u/lucien15937 [link] [comments]

Why does wet rubber squeak when rubbed? Posted: 08 Oct 2016 02:34 AM PDT Normally when rubber is dry it does not make much sound rubbing on the ground, but when it gets wet it can cause a high pitch squeak when making contact with, say, the ground. submitted by /u/The_Fronz [link] [comments]

How do calculators evaluate the zeroes of polynomials? Does it depend on the nature of the polynomial? Posted: 08 Oct 2016 06:00 AM PDT Hello, I'm curious to know how my calculator (it's a Casio) calculates the roots to polynomials. I would guess for quadratics, it uses the formula, and probably for cubics and quartics. But above that, there are no general formulas, so it has to use approximate methods somehow. What approximate methods do calculators use for root-finding of polynomials, and what degree of polynomials do they use them for? (Would a 4th degree polynomial be evaluated with an approximate method, or the monstruous formula?) Thanks! submitted by /u/tsterTV [link] [comments]

If we find life on Mars, how will we know it didn't come from tiny organisms on any of the rovers? Posted: 07 Oct 2016 11:58 PM PDT submitted by /u/_cs [link] [comments]

Is the role of pressure vs. concentration gradient for gas solutions the same as it is for liquid solutions? Posted: 08 Oct 2016 05:50 AM PDT Let's say you have two equal volume, equal temperature chambers separated by a semipermeable membrane: In the left chamber there is pure oxygen at 2 atmospheres of pressure. In the right there is pure nitrogen at 1 atmosphere of pressure. The membrane is only permeable to nitrogen. What happens? Is it similar to the usual osmotic pressure teaching example? Does the nitrogen diffuse into the left chamber increasing the pressure gradient until it counteracts the diffusion gradient? submitted by /u/gmieom [link] [comments]

Why does my face turn red during strenuous activity instead of the body part(s) I'm using? Posted: 08 Oct 2016 02:02 AM PDT If I'm lifting something heavy, to me it would make more sense that blood rushes to my arms instead of my face submitted by /u/Alcaeus89 [link] [comments]

How does Asymetric Encryption actually work? Posted: 08 Oct 2016 05:30 AM PDT Hello Reddit, I learned about encryption using asymetric keys a few years ago, but never truly understood it. I get that (for example) I have a public key and a private key and then you also have your own public key and private key; that if we swap public keys that I can encrypt a message using your public key that you can decrypt with your private key; but in the end, it all still seems like a magical black box. What would this look like in the real world? Are there any more "tangible" examples not in cyberspace?? Thanks! submitted by /u/SandShepherd [link] [comments]

Does a massless particle traveling through a medium experience the passage of time? Posted: 08 Oct 2016 01:14 AM PDT For example, if a photon is slowed traveling through a medium it is moving slower than C. So would it experience time? submitted by /u/tkiens [link] [comments]

How do modern game clients allow you to play a game before its finished downloading? Posted: 08 Oct 2016 01:10 AM PDT Recently, Origin (EA) and Uplay (Ubisoft) have gotten a new feature. Whenever you download a game, you can play it whilst it is downloading, as soon as it gets past a certain percentage downloaded. For example, I was downloading a racing game called "The Crew" and I could play the game as soon as 10% of it had downloaded, without installing anything, and the quality seemed just fine. How does this work? It is blowing my mind. submitted by /u/Urnquei [link] [comments]

If HIV was wiped out could it ever come back again? Posted: 08 Oct 2016 04:28 AM PDT Imagine if everyone today that was HIV positive didn't spread it to anyone else, when they eventually all died and there was no longer anyone on the planet that had the virus is there any way it could reappear in humans again? submitted by /u/geoffs3310 [link] [comments]

Do we know where the matter that created the sun came from? Is our solar system the rebirth of a previous star, or one of the original stars from the Big bang? Posted: 07 Oct 2016 01:04 PM PDT Or are there other ways for stars to originate that I'm not aware of. submitted by /u/TacosArePeopleToo [link] [comments]

What are some strange things that happen under EXTREME magnetic fields? Posted: 07 Oct 2016 09:48 AM PDT I was reading about the magnetar SGR 1806-20, which has a magnetic field of 1015 Gauss (1011 Tesla in intensity) . The article said that if this magnetar were as close as the moon to Earth, it could re-arrange the molecules in your body. What are some other wacky quantum and macroscopic things that happen under these most powerful magnetic fields in the universe? What could happen under even greater strength fields? submitted by /u/iadd [link] [comments]

Can radar be used to track small moving objects like basketballs? Posted: 08 Oct 2016 12:39 AM PDT Another person asked a similar question in the context of tracking bullets. But what if you only wanted to track small moving objects, like a ball or a person, within a 1000 foot radius? Is that possible with radar? If not, could you explain why? If yes, would the radar device need to be large, or could it be made into a handheld device? Radar is very cool, and reading the question prompted deeper questions. :) Thanks so much! submitted by /u/panabee [link] [comments]

A planet sized ball of water - what would happen? Posted: 07 Oct 2016 01:54 PM PDT Say you had a planet sized ball of water entering the solar system from interstellar space to take up an orbit between Mars and Earth. Something approximately double the size of Earth, and all it was made of was pure H2O. No impurities, no residual trace elements, literally nothing else. What would happen? Would it be frozen just on the outside, or all the way down to it's "core"? Would the core experience fusion? Would the outer layer be frozen solid, and then there be a liquid inner layer, and then finally a solid inner layer because of pressure? What would happen? Any thoughts would be greatly appreciated. Thank you. submitted by /u/VertigoOne [link] [comments]

In most pictures of planets why are there no stars in the background? Posted: 08 Oct 2016 03:33 AM PDT https://i.imgur.com/biVkvOX.jpg http://i.imgur.com/v89fj5P.jpg https://c1.staticflickr.com/9/8556/30055660701_c1c725cdba_o.png http://i.imgur.com/9dfK0pK.jpg In all of these pictures you cannot see stars around the planets. Why? The last picture, of the moon, especially confuses me. From earths surface we can see stars in the sky - why is that different from the moon's surface? submitted by /u/K0bb [link] [comments]

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Is Hurricane Matthew indicative of the end of the 11 year super quiet period of major North American hurricane activity or are conditions still generally unfavorable for hurricane formation?

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• Is Hurricane Matthew indicative of the end of the 11 year super quiet period of major North American hurricane activity or are conditions still generally unfavorable for hurricane formation?
• Do you get blackbody radiation from a pure gas?
• Why are there bubbles in prince Rupert's drops?
• Why do tropical cyclones / hurricanes tend not to form over the tropical waters of the south Atlantic?
• What is stopping us from using weather modeling and our understanding of physics to predict future weather for all places in the world for years out within a small margin of error?
• Why does one twin age more in the traveling twins paradox?
• What is the uncertainty of a calculated value when I know the uncertainty of the measured values going into it?
• What are particles in the holographic principle?
• Why aren't polar deserts sandy?
• What happens on the molecular level during semiconductor doping?
• Can the relativity of space and time be considered to be consequences of the constancy of the speed of light? How?
• What are the causes for a hurricane of this magnitude? (Hurricane Matthew)
• As CO2 concentrations increase and temperatures rise, will the temperature at which C3 carbon fixation is in equilibrium with photorespiration rise more or less than ambient temperature (average)?
• How do hall effect sensors in phones avoid motion induced errors?
• How do we know the shape of our galaxy?
• How are underwater currents formed and how do they remain independent of the same substance (water) around them?
• Do corvids hunt based on sight or scent?
• Why is visible light safe for animals?
• Do you need to correct for perspective when measuring velocity with a high speed camera?

Is Hurricane Matthew indicative of the end of the 11 year super quiet period of major North American hurricane activity or are conditions still generally unfavorable for hurricane formation? Posted: 06 Oct 2016 11:34 AM PDT submitted by /u/sillybun99 [link] [comments]

Do you get blackbody radiation from a pure gas? Posted: 07 Oct 2016 07:14 AM PDT What are the characteristics of a material that allow it to emit blackbody-like radiation? In a cloud of molecular gas (i.e., a star forming region), will you only get blackbody radiation from the dust? Or will you also get blackbody radiation from the gas? submitted by /u/ThisIsManada [link] [comments]

Why are there bubbles in prince Rupert's drops? Posted: 06 Oct 2016 02:30 PM PDT physics -I am a glass artist and engineering student. I have recently been practicing prince Rupert's drops (and failing hard (I only have a one foot tall turkey fryer to quench drops (makes it hard to avoid sides and bottom with drop))). I could not help but to notice bubbles inside the drop when I knew 100% that there were none, especially of that size, in the glass before. So how on earth did they get there????? Did the Oxygen in the SiO2 get squeezed out of their bonds and manifest as a gas or something?? Because I'm pretty sure the drop doesn't open up to let any H2O in to be hydrogen or oxygen source for gas. If I could get a good response here it would seriously make my day!! I am just so curious and I have no clue what is going on. Thank you SO MUCH in advance for answering this if/when you do who ever awesome science guy or girl you are. submitted by /u/Seaguard5 [link] [comments]

Why do tropical cyclones / hurricanes tend not to form over the tropical waters of the south Atlantic? Posted: 06 Oct 2016 12:49 PM PDT I was researching hurricanes, since one is about to hit Florida. In doing so, I found a map that tracks tropical cyclones and depressions worldwide from 1946-2006. In that sixty-year period, all tropical oceanic basins (greater than about 5° latitude away from the equator) had numerous hurricanes. But the south Atlantic only had two, and neither seemed to make it beyond tropical storm strength on the Saffir-Simpson scale. Why is this? What about the south Atlantic makes it so unfavorable for tropical cyclone formation? submitted by /u/pHScale [link] [comments]

What is stopping us from using weather modeling and our understanding of physics to predict future weather for all places in the world for years out within a small margin of error? Posted: 06 Oct 2016 07:26 PM PDT submitted by /u/1Rab [link] [comments]

Why does one twin age more in the traveling twins paradox? Posted: 06 Oct 2016 08:18 PM PDT So, after reading a couple articles and having a college physics background, I'm really not understanding why the twin traveling at the speed of light ages more. My confusion is not from traveling near the speed of light, but in the fact that it seems like the duration of the trip near the speed of light plays a pivotal role in the twins aging. So, you have twin A who is at rest in a space station. Twin B leaves the station, travels out 20LY at near-C speeds, and travels 20LY back to the space station, and now they're 40 (approximately) years younger than their twin who remained behind. Here's where my lack of understanding comes in: Let's say their ship is super awesome, and they only spend "a brief period of time" (<1hr) accelerating and decelerating on either end of the trip. So, for almost the entire duration of their 40 year trip, they are coasting. If that's true, then technically they are both at rest, aside from the brief period of acceleration. Then WHY is the traveling twin older?? submitted by /u/huzzaboot [link] [comments]

What is the uncertainty of a calculated value when I know the uncertainty of the measured values going into it? Posted: 06 Oct 2016 04:12 PM PDT I've got the equation F = (C-B)/C. I know the uncertainty in C to be X and the uncertainty in B to be Y. What is the uncertainty in F? Thanks guys submitted by /u/AOEUD [link] [comments]

What are particles in the holographic principle? Posted: 06 Oct 2016 07:11 PM PDT According to Verlinde, gravity is emergent from the holographic principle as an entropic force. According to this, attempts to find a quantum carrier of the gravitational force are fundamentally misguided and will never be successful. Taking this paradigm as given for the sake of argument, what are particles like electrons and photons in terms of the holographic principle? How do they arise? edit: I'd like to clarify that the question is asked from the perspective of the holographic principle where everything is information on screens. That is the answer I'd like to know...not presupposing other fields, nor criticizing the holographic principle. submitted by /u/ktool [link] [comments]

Why aren't polar deserts sandy? Posted: 06 Oct 2016 11:23 AM PDT I realise there's no requirement for a desert to be sandy, but I'm wondering if there's a particular reason that the polar deserts on Earth are nearly all rock or gravel rather than having sand. Is there a reason for it, or is it just one of those things? Is a sandy polar desert on an earthlike planet possible? What conditions would need to be met for a polar desert to become sandy? submitted by /u/Werrf [link] [comments]

What happens on the molecular level during semiconductor doping? Posted: 06 Oct 2016 12:23 PM PDT submitted by /u/nottoodrunk [link] [comments]

Can the relativity of space and time be considered to be consequences of the constancy of the speed of light? How? Posted: 06 Oct 2016 10:50 AM PDT I don't know much about this, only that space and time are 'relative' to the reference point used, and that a massless particle travels at the same speed regardless of where or when it is observed. What I do know about, is that speed is the distance traveled over the time taken to travel it. If I would want the speed to not be changed, but increase the time taken to travel the distance, then I would have to increase the distance traveled in order to do so, and vice versa. Could this be used to explain why space and time are relative to each other, if the speed of light is always the same? I'm only a year 12 student, so I guess there's probably something I haven't considered yet, so please do tell me! submitted by /u/SpaceTimeandLight [link] [comments]

What are the causes for a hurricane of this magnitude? (Hurricane Matthew) Posted: 06 Oct 2016 12:37 PM PDT As hurricane matthew nears florida (And the carbon levels went over 400 PPM), what would cause a category 4 hurricane of this magnitude? Does it have any correlation with global warming or Climate Change? submitted by /u/RedneckAvengers [link] [comments]

As CO2 concentrations increase and temperatures rise, will the temperature at which C3 carbon fixation is in equilibrium with photorespiration rise more or less than ambient temperature (average)? Posted: 06 Oct 2016 09:26 AM PDT With increasing global temperatures and increasing CO2 concentrations, there seem to be two contrary effects on C3 photosynthesis: CO2 + H2O + RuBP ⇔ 2 3-phosphoglycerate Higher temperature favors the reaction going to the left, with more entropy. Higher CO2 concentration favors the reaction going to the right, as per mass action law. (This might be a bit of an oversimplification of the real photorespiration process, I guess.) I guess I'm wondering which of these two effect is likely to be larger. Will higher CO2 concentrations have a larger effect than temperature increases, allowing C3 plants to move into environments previously too hot for them, or will temperature increases have a larger effect, limiting C3 plants to cooler areas? submitted by /u/Maklodes [link] [comments]

How do hall effect sensors in phones avoid motion induced errors? Posted: 06 Oct 2016 12:24 PM PDT Unless something esoteric has escaped me since undergrad E&M all Hall effect sensors must operate under the Lorentz force law. I had this question a few years ago but I've forgotten the answer. We all know that F = q(E+VxB) and in the sensor its taken for granted that V is current but in the real world, people walking around with the sensor in their pocket, that V also includes the motion of the physical sensor through the earth's 'static' B. Yet the physical motion of the sensor doesn't screw up the reading and if I remember correctly there is a simple reason why. So... Why??? Does the motional induced polarization across the sensor produce an E field that cancels the effect? Example: https://www.quora.com/How-does-the-compass-on-the-iPhone-work submitted by /u/PhysicsNovice [link] [comments]

How do we know the shape of our galaxy? Posted: 06 Oct 2016 10:15 AM PDT As a corollary question, how do we know our location within our galaxy? submitted by /u/unlived_life [link] [comments]

How are underwater currents formed and how do they remain independent of the same substance (water) around them? Posted: 06 Oct 2016 09:26 AM PDT Additionally, how much of an impact do estuaries (like where a fresh water river meets the ocean) and/or melting ice at/around the poles have on creating these currents? submitted by /u/Sixwingswide [link] [comments]

Do corvids hunt based on sight or scent? Posted: 06 Oct 2016 11:28 AM PDT submitted by /u/kingjj77 [link] [comments]

Why is visible light safe for animals? Posted: 06 Oct 2016 09:02 AM PDT I was wondering the other day in class about this. I get that radio waves and microwaves are not harmful. As I understand it, this is because they carry too little energy/have long enough waves that they cannot excite the electrons in many materials to the next energy level. This means they pass through without interacting. I also get why high-energy UV waves, x-rays, and gamma waves can be harmful to human tissue. The waves carry so much energy that they can pull electrons off of atoms, screwing with the compounds in our cells. So what is special about visible light? Obviously the millions or billions of visible light rays bombarding our eyes are skin aren't harmful. But they are being somewhat absorbed and somewhat reflected by at least the top few layers of skin. Why wouldn't this constant excitement and decay of skin electrons be harmful? submitted by /u/JohnnyComeLater [link] [comments]

Do you need to correct for perspective when measuring velocity with a high speed camera? Posted: 06 Oct 2016 07:11 AM PDT The set up is a high speed camera filming an arrow with a black / white scale as a back drop. The camera is 20ft away from the back drop, and the arrow travels 2 ft away from the back drop. Based on similar triangles, should I subtract 10% of the distance measured on the scale when determining the distance the arrow traveled? submitted by /u/adoug5 [link] [comments]

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