If an electric motor is supplied power but restricted in turning (like holding back a ceiling fan) what is happening which would cause it to 'burn up'?

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• If an electric motor is supplied power but restricted in turning (like holding back a ceiling fan) what is happening which would cause it to 'burn up'?
• If a redwood or pine tree were to live in the perfect conditions, with enough nutrients and without pests or disease or deforestation. Could the tree live forever?
• Why is greenhouse gas one way?
• Why do things seem to start spinning the other way after reaching a certain speed?
• If, instead of electromagnetic force, Magneto had control over the weak nuclear force, what would be the things he could do?
• 130000 year old mastadon in California. There aren't signs of meat removal on the bones. How do they know WHEN the tools were used to process the bones?
• What sort of negative consequences could result from a desert ecosystem suddenly receiving an exorbitantly large increase in rainfall?
• How do fins stabilize a rocket (or any other projectile)?
• Why are severe allergic reactions to peanuts and other nuts so common compared to other foods and potential allergens?
• Why do we take consider a zero point at r = infinity for Gravitational Potential Energy?
• Why are Magnetars extremely magnetic?
• Are men more likely to part with resources in the presence of attractive women?
• Why does a ray of beta particles curve more than a ray of alpha particles in an electric field?
• Why does boundary flow stay attached to an airfoil?
• Why do second and third gen stars contain heavier elements that the first gen stars?
• Could you be struck by lightning inside a storm cloud?
• Why is it that early human remains are so rare to find in the Americas?

If an electric motor is supplied power but restricted in turning (like holding back a ceiling fan) what is happening which would cause it to 'burn up'? Posted: 26 Apr 2017 10:31 PM PDT submitted by /u/Gergs [link] [comments]

If a redwood or pine tree were to live in the perfect conditions, with enough nutrients and without pests or disease or deforestation. Could the tree live forever? Posted: 26 Apr 2017 09:41 PM PDT submitted by /u/KidKannabis [link] [comments]

Why is greenhouse gas one way? Posted: 26 Apr 2017 07:48 PM PDT So green house gas like CO2 supposedly keeps heat inside the atmosphere, but if it doesn't let heat back outside the atmosphere, why can heat get inside in the first place? submitted by /u/scottymooney [link] [comments]

Why do things seem to start spinning the other way after reaching a certain speed? Posted: 26 Apr 2017 07:45 PM PDT submitted by /u/PhantomSquared [link] [comments]

If, instead of electromagnetic force, Magneto had control over the weak nuclear force, what would be the things he could do? Posted: 26 Apr 2017 02:30 PM PDT assuming he can control as well as he does magnetism(even though probably it does not correlate a 1 to 1 mach) submitted by /u/joaosturza [link] [comments]

130000 year old mastadon in California. There aren't signs of meat removal on the bones. How do they know WHEN the tools were used to process the bones? Posted: 26 Apr 2017 07:59 PM PDT How feasible is it that 13000 years ago like current science believes whatever evolution of humans found the bones and processed them for the bone 117000 years ago? The tools can't be dated, right? They are stone and could have been in the area; there's reasonable doubt unless we can tell when a rock was broken to form it with dating and I am unaware? The lack of meat removal from the bones suggests the meat was unusable for whatever reason. Or am I just waaay left field? submitted by /u/aftersexhigh5s [link] [comments]

What sort of negative consequences could result from a desert ecosystem suddenly receiving an exorbitantly large increase in rainfall? Posted: 26 Apr 2017 07:31 PM PDT submitted by /u/GraveyardGuide [link] [comments]

How do fins stabilize a rocket (or any other projectile)? Posted: 26 Apr 2017 07:07 PM PDT submitted by /u/pestoroll [link] [comments]

Why are severe allergic reactions to peanuts and other nuts so common compared to other foods and potential allergens? Posted: 26 Apr 2017 03:04 PM PDT submitted by /u/ItHasToBeAJuicer [link] [comments]

Why do we take consider a zero point at r = infinity for Gravitational Potential Energy? Posted: 26 Apr 2017 06:07 PM PDT I have two questions, a main one (title) and a side question I added. 1) The first one has to do with the formula for deriving Gravitational Potential Energy. I learned that, for the derivation of Gravitational Potential Energy given large distances, we have to use the mathematical analytic way to derive an expression for it at a given distance. To do so, you need integrate F dot dr from r to infinity. However, what I don't understand are as follows: Why do we need to take the zero point at r = infinity? Why can't I take it from any arbitrary point to get a general expression for its GPE when I integrate? Why is the work required to push an object to that height equal to the force due to gravity times the distance? Don't I need to apply a force that overcomes the force due to gravity to even raise it to begin with? Fg * h is definitely greater in magnitude than fg, but if I'm applying work to an object equal to Fg * h in the opposite direction of where it wants to move (towards the dominant object's COM) how do I know the magnitude of that work is sufficient to do so? If I was trying to figure out how much energy I need to give an object to raise it from one point in space to another relative to, say the Earth, I could take the change in energy from the two points. If its energy at its initial point is 2 and the energy at the point I want it to be at is 8, I need to supply 6 joules to it. But how do I reconcile that with the derivation from the above paragraph? 2) The second question has to do with zero points for potential energy. Is this allowed because, as long as the distance from each object relative to another is the same no matter where I place a zero point, everything resolves? If at point A, object 1 is 2 units from point A and object 2 is 5 units from point A (all in, say, the x axis), then I'm not cheating by taking point B to be at object 1's position and saying object 2 is now 3 units from point B, right? Wouldn't its potential energy then change here though? That's okay because it's all relative, right? But the magnitude changes.. that's okay? submitted by /u/sangstar [link] [comments]

Why are Magnetars extremely magnetic? Posted: 26 Apr 2017 12:35 PM PDT From my knowledge of magnetism, extreme heat would remove magnetic properties from substances by messing with the spin of electrons in orbit. So why are magnetars, which reach such extreme levels of heat, still so powerfully magnetic. submitted by /u/SuperKalkorat [link] [comments]

Are men more likely to part with resources in the presence of attractive women? Posted: 26 Apr 2017 01:27 PM PDT I recall reading studies of this nature and I'm currently writing a piece on related issues. Any help appreciated. submitted by /u/eradicati0nx [link] [comments]

Why does a ray of beta particles curve more than a ray of alpha particles in an electric field? Posted: 26 Apr 2017 01:51 PM PDT So I know the an alpha particle consists of 2 protons and 2 neutrons and that a beta particle consists of just one electron How is it that a ray of beta particles will curve more in an electric field than a ray of alpha particles? submitted by /u/DiamondxCrafting [link] [comments]

Why does boundary flow stay attached to an airfoil? Posted: 26 Apr 2017 12:31 PM PDT I'm a pilot studying to be a flight instructor, and I'm really trying to brush up on my aerodynamics. I have a background in the natural sciences, but never took physics, so a lot of it is kind of "learn as I go." From what I've come to understand, the Coanda effect really doesn't apply because we're not dealing with a fluid jet. The explanation I've heard is that the curvature of an airfoil creates a centripetal acceleration, which creates a pressure gradient where lower pressure exists closer to the airfoil. But there's some relationship I'm missing, because to me that seems dependent on a tendency to stay attached to the surface. As I understand it, in order for there to be centripetal force acting on the fluid, some additional force must be acting on it to keep the boundary flow attached. Otherwise, when the air diverts over the top of the wing, it would just continue unaccelerated past the upper camber of the airfoil. So what keeps the boundary flow "attached" to the airfoil? Is it something as simple as friction? Any help to understand all of the various forces affecting curved boundary flows would be much appreciated! submitted by /u/Longhornmaniac8 [link] [comments]

Why do second and third gen stars contain heavier elements that the first gen stars? Posted: 26 Apr 2017 05:02 PM PDT Thanks *than submitted by /u/Litllerain123 [link] [comments]

Could you be struck by lightning inside a storm cloud? Posted: 26 Apr 2017 04:58 PM PDT If I were somehow able to suspend myself inside a storm cloud, or stood on top of a blimp or some type or airship, would I be struck by lightning? Or would the lightning ignore me and go for the tallest object attached to the ground? submitted by /u/FourSquareRedHead [link] [comments]

Why is it that early human remains are so rare to find in the Americas? Posted: 26 Apr 2017 06:21 PM PDT I just read through an article detailing the find of a mastodon skeleton that seems to show evidence of early human tool-making and use from ~130,000 years ago. In the article they mention that early human remains are notoriously difficult to find. Why is that? Edit: original thread submitted by /u/Clevercapybara [link] [comments]

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The second law of thermodynamics seems to clash with the Stefan-Boltzman law in the following example. How can they be reconciled?

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• The second law of thermodynamics seems to clash with the Stefan-Boltzman law in the following example. How can they be reconciled?
• A bluish aurora-like streak informally called "Steeve" has been recurrently spotted int the night sky of the Canadian prairies - what might it be, and how could this phenomenon be investigated?
• What is the difference between the negative gravitational potential energy shared among two objects and the negative energy theoretically required to create an Alcubierre drive?
• When moisturiser "sinks into" your skin, what actually happens?
• What is the mean temperature of ITER as a whole when running?
• Did primitive human groups have 'leaders'? And if so how were the 'leaders' decided?
• How does the nucleus in atoms stay together?
• What makes something radiation-proof?
• How does climate change cause the bleaching of the Great Barrier Reef?
• I read somewhere that the AC travels on the surface of a conductor and the DC travels through the entire volume of the conductor. Why does this happen?
• What are the general characteristics of different periods in Earth's geologic history (e.g., Permian)? What criteria are used to separate one period from another?
• If two quantum particles are "entangled" and one is moved a great distance away, will it still react accordingly when its partner is subjected to a change?
• Do cells of different body parts go through mitosis at different rates?
• How dp particles interact with the Higgs Field?
• What's happening in your brain when you experience deja vu?
• How did Tyco Brahe account for movement of Earth in his measurements?
• How can Venus Flytraps close on their pray without a nervous system or muscles?
• What is the effective actual brightness in relation to the human eye of planetary objects in the distant solar system? What I mean is: are photos of Saturn the brightness they are due to long exposures or would they actually be relatively dim objects due to their distance from the sun?
• I just learned that the Aral Sea no longer exists and is now mostly a desert. Are there, and what are other comparable "recent" drastic changes of physical geography or biomes?
• Does being in shape make you burn less calories during equivalent exercise?
• What is different between a piece of matter and a piece of antimatter?
• Why don't professional athletes suffer from hearing damage due to constantly performing in extremely loud environments?

The second law of thermodynamics seems to clash with the Stefan-Boltzman law in the following example. How can they be reconciled? Posted: 26 Apr 2017 03:49 AM PDT The second law of thermodynamics tells us that thermal energy spontaneously flows from a hot reservoir to a cold reservoir. Thus, it follows that no set of lenses and mirrors built around the sun can heat the earth to a hotter temperature than TSun. On the other hand, the Stefan-Boltzmann law tells us that the power radiated from a back body is proportional to P~AT4. Now imagine you could engulf sun-earth a system of two black bodies with radii R1 and R2, where R1<<R2 with a parabolic mirror, such that the sun and the earth are in the focal points of the parabola. Let us furthermore assume that the larger black body is held at a constant temperature T1. Then, all the power radiated by either body will be focused on the other. Thus it follows that A1 T14 = A2 T24 Hence, since A1 < A2 it follows that T1 > T2. But that violates the second law of thermodynamics. Where did I go wrong? submitted by /u/Concrete-Jungle [link] [comments]

A bluish aurora-like streak informally called "Steeve" has been recurrently spotted int the night sky of the Canadian prairies - what might it be, and how could this phenomenon be investigated? Posted: 26 Apr 2017 05:46 AM PDT source: http://www.cbc.ca/news/canada/calgary/alberta-aurora-chasers-scientists-steve-1.4084625 submitted by /u/Gargatua13013 [link] [comments]

What is the difference between the negative gravitational potential energy shared among two objects and the negative energy theoretically required to create an Alcubierre drive? Posted: 26 Apr 2017 04:30 AM PDT submitted by /u/RyanAHixon [link] [comments]

When moisturiser "sinks into" your skin, what actually happens? Posted: 25 Apr 2017 06:01 AM PDT Where does it go? submitted by /u/skeletonclock [link] [comments]

What is the mean temperature of ITER as a whole when running? Posted: 26 Apr 2017 02:36 AM PDT I was wondering, given that the fusion reactor chamber contains hydrogen and stuff at millions of degrees, does this notably increase the temperature of the reactor as a whole? I mean, the reactor weighs about 5000 tons of steel, but it also has 0.5 gram hydrogen in its reaction chamber at 100,000,000 Kelvin, so I'm wondering what temperature would the whole reactor as a whole have. submitted by /u/Laborbuch [link] [comments]

Did primitive human groups have 'leaders'? And if so how were the 'leaders' decided? Posted: 25 Apr 2017 07:59 AM PDT Edit: By primitive I mean pre-civilization, like Neanderthal time. submitted by /u/NachoBait [link] [comments]

How does the nucleus in atoms stay together? Posted: 25 Apr 2017 06:36 PM PDT Basically that, how do all the protons stay together when their electromagnetic fields should make them repel each other ? submitted by /u/Fyrember [link] [comments]

What makes something radiation-proof? Posted: 25 Apr 2017 08:50 PM PDT What causes something like lead to block radiation? submitted by /u/Chukedog [link] [comments]

How does climate change cause the bleaching of the Great Barrier Reef? Posted: 25 Apr 2017 05:58 PM PDT I read an article recently claiming that, yet it didn't provide clear evidence or really explain how it does, may some one clarify for me please? submitted by /u/cam3lwolfman [link] [comments]

I read somewhere that the AC travels on the surface of a conductor and the DC travels through the entire volume of the conductor. Why does this happen? Posted: 25 Apr 2017 08:25 AM PDT submitted by /u/navyaagarwal [link] [comments]

What are the general characteristics of different periods in Earth's geologic history (e.g., Permian)? What criteria are used to separate one period from another? Posted: 25 Apr 2017 08:52 PM PDT submitted by /u/Eastcoastnonsense [link] [comments]

If two quantum particles are "entangled" and one is moved a great distance away, will it still react accordingly when its partner is subjected to a change? Posted: 25 Apr 2017 06:37 PM PDT I admit I'm not even sure the question makes sense (I never went further than earning my A in calculus-based physics), but here goes. In the midst of an argument with an acquaintance about whether modern physics research supports various nebulous and semi-spiritual claims he was making about the connectedness of the universe, the power of the collective conscious to manifest things in reality, etc., he brought up the concept of quantum entanglement. He assured me that two quantum particles could become connected in such a way that even if one was subsequently moved a great distance away, the two would continue to influence one another in experimentally measurable ways. The example he gave was "like you could flip one's spin or something and the other particle would mirror that change from halfway across the world." I told him laypeople like us often misunderstand the significance and real meaning of high-level research like he was describing and that I was SURE what he described is not how matter actually behaves. In fact, I told him if he could produce a reputable scholarly research article where that phenomenon had been observed, I would pay him $100. He first tried to send me the Wikipedia page about quantum entanglement, and when I rejected that, he sent a link to this article that admittedly goes over my head. So...do I owe him the money? If what he's claiming is true and changes to a particle in Chicago could influence the behavior of a particle in Paris, it will sort of revolutionize the way I see matter and our universe. I still won't accept the majority of his lofty claims, but this one would blow my mind. I'm totally willing to accept being wrong, but I am SO very much hoping that the more enlightened minds of the AskScience community will tell me that he is indeed misinterpreting this idea. Thanks for any insight you are able to provide! submitted by /u/hydrophile3 [link] [comments]

Do cells of different body parts go through mitosis at different rates? Posted: 25 Apr 2017 07:11 PM PDT Maybe the best example I can think of is that I don't think it takes as long for a fingernail to grow 1 cm as it does a 1 cm wide wide to heal. submitted by /u/yerekdoung [link] [comments]

How dp particles interact with the Higgs Field? Posted: 26 Apr 2017 12:08 AM PDT I am a 3rd year physics undergraduate doing research and a presentation on the ATLAS and CMS detectors at the LHC. I have done some reading on various CERN websites but I need some gaps filled in: I've taken introductory modern physics but have yet to take QM or EM courses. So far I seem to understand that this non-zero field in a vacuum is similiar to the elecrromagmetic field, but instead is able to apply mass to fermions, bosons, etc. which interact with the field, but I'm not exactly sure why this happens? What process selects which particles have mass and which do not? I may have more questions to follow, but let's start with this. P.S. I'm posting on mobile before I fall asleep at my desk, I apologize in advance for any grammatical / formatting errors. Title edit: How *do particles interact with the Higgs Field? submitted by /u/michouse [link] [comments]

What's happening in your brain when you experience deja vu? Posted: 25 Apr 2017 10:55 AM PDT submitted by /u/ImOnRedditPeeps [link] [comments]

How did Tyco Brahe account for movement of Earth in his measurements? Posted: 25 Apr 2017 10:47 PM PDT If Earth did not rotate, it would be comparitively simple to face the same direction every time for each measurement, and mark the position of an orbiting object. But Earth rotates as well as orbits. How did Tyco account for all of this? Also, how could he tell objects were moving in an elliptical orbit? submitted by /u/yosimba2000 [link] [comments]

How can Venus Flytraps close on their pray without a nervous system or muscles? Posted: 25 Apr 2017 11:26 AM PDT submitted by /u/DaDerpyDude [link] [comments]

What is the effective actual brightness in relation to the human eye of planetary objects in the distant solar system? What I mean is: are photos of Saturn the brightness they are due to long exposures or would they actually be relatively dim objects due to their distance from the sun? Posted: 25 Apr 2017 11:21 AM PDT submitted by /u/brettwayneprice [link] [comments]

I just learned that the Aral Sea no longer exists and is now mostly a desert. Are there, and what are other comparable "recent" drastic changes of physical geography or biomes? Posted: 25 Apr 2017 10:06 AM PDT Link to wikipedia article here. I'm a bit surprised I didn't hear of this before, since it seems like a perfect example of human-caused climate change. I'm also aware that many dams will create sizeable lakes, but this seems like it would be much smaller than the disappearance of the Aral sea. submitted by /u/ddxexex [link] [comments]

Does being in shape make you burn less calories during equivalent exercise? Posted: 25 Apr 2017 12:09 PM PDT This is an odd question, so bear with me. Assuming everything else was kept the same, would one person who was in shape burn the same amount of calories as someone who is out of shape? For example, if someone had the same bodily dimensions​ as someone else, and they both ran a mile, at the same exact pace, they would be putting in the same amount of WORK, but not necessarily the same amount of effort. For example, someone who hasn't run in a while might have a more difficult time doing a 5k than someone who works out frequently, but do they necessarily burn more calories or not? submitted by /u/Flobro4 [link] [comments]

What is different between a piece of matter and a piece of antimatter? Posted: 25 Apr 2017 10:52 AM PDT What numbers and values change? And why is there not an anti-photon? submitted by /u/PederPie [link] [comments]

Why don't professional athletes suffer from hearing damage due to constantly performing in extremely loud environments? Posted: 25 Apr 2017 11:07 AM PDT Pro sporting events are very well documented as being so loud that they cause hearing loss among fans. It seems to me that, above all, the greatest danger would be to the athletes themselves, since they are at the center of attention for every match. Although it might not pose a big problem for sports with less frequent matches, such as NFL players or professional boxers, how is it that players in the NBA or NFL, with 82 game seasons, don't suffer hearing damage? submitted by /u/Asp184 [link] [comments]

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So atmospheric CO2 levels just reached 410 ppm, first time in 3 million years it's been that high. What happened 3 million years ago?

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• So atmospheric CO2 levels just reached 410 ppm, first time in 3 million years it's been that high. What happened 3 million years ago?
• Why can't I use lenses to make something hotter than the source itself?
• If E=mc^2, my total energy is constant as my mass is constant. If I gain potential energy because I went up an elevator, my energy level changes but my mass is constant. What gives?
• Why do muscle cramps hurt?
• I fill the bottom of a bottle cap with my blood and let it dry overnight. Then I put the dried disc in a cup of water. the color leaves the disc and seeps into the water. I'm left with a translucent, slimy material. What is it?
• Why does water tend to follow the path of a nearby object instead of going straight down?
• What happens with degenerate wave functions in an atom?
• My textbook says "a complete explanation of why entropy increases with increasing molar mass is beyond the scope of this book." Could someone explain to me why?
• How do electrons "jump" to different energy levels without existing in-between the levels?
• Why do the noble gasses have such a small gap between their melting and boiling points compared to other elements?
• Why did scientists in the '60's think that Mars was covered in vegetation?
• How deep are the atmospheres of the Jovian planets?
• [Medical] How do they treat patients that are infectious enough to be dangerous?
• The Fukang meteorite is estimated to be 4.5 billion years old, how is it that people manage to estimate its age?
• If you had a large spherical radioactive sample, how much radiation would reach the surface?
• How is it that the concept of an Electromagnetic Field avoids the problems caused by the concept of a "Luminiferous aether" with regards to relativity?
• A year has Pi*10^7 seconds, where is the connection?
• What makes mercury and gallium liquids at room temperature when elements around them on the periodic table are solids?
• How do bots bypass captcha?
• Science or scam? "13 year old builds FREE energy device for under $15!"
• When we substract two natural numbers we get integers, when we divide two integers we get rationals, when we take roots of a positive rational we get reals, of a negative one we get complex. What is the next step?
• Will internal combustion engines ever reach a point where they emit zero carbon dioxide?
• Why the information paradox defies unitarity?
• By treating genetically transferrable conditions, are physicians effectively allowing the passing-on of them, and possibly even lowering life expectancy long-term?

So atmospheric CO2 levels just reached 410 ppm, first time in 3 million years it's been that high. What happened 3 million years ago? Posted: 24 Apr 2017 06:35 AM PDT what happened 3 million years ago to cause CO2 levels to be higher than they are today? https://www.scientificamerican.com/article/we-just-breached-the-410-ppm-threshold-for-co2/ submitted by /u/Bluest_waters [link] [comments]

Why can't I use lenses to make something hotter than the source itself? Posted: 25 Apr 2017 04:33 AM PDT I was reading What If? from xkcd when I stumbled on this. It says it is impossible to burn something using moonlight because the source (Moon) is not hot enough to start a fire. Why? submitted by /u/Yrjosmiel [link] [comments]

If E=mc^2, my total energy is constant as my mass is constant. If I gain potential energy because I went up an elevator, my energy level changes but my mass is constant. What gives? Posted: 25 Apr 2017 06:29 AM PDT It seems like there's a discrepancy. Does E=mc2 not represent your total energy? submitted by /u/Negropolis [link] [comments]

Why do muscle cramps hurt? Posted: 24 Apr 2017 02:04 PM PDT I understand that muscle cramps are involuntary contractions of the muscle, but when our muscles contract voluntarily, it doesn't hurt. What about an involuntary contraction causes pain? submitted by /u/HarryButtfarb [link] [comments]

I fill the bottom of a bottle cap with my blood and let it dry overnight. Then I put the dried disc in a cup of water. the color leaves the disc and seeps into the water. I'm left with a translucent, slimy material. What is it? Posted: 24 Apr 2017 05:23 PM PDT submitted by /u/sexfart [link] [comments]

Why does water tend to follow the path of a nearby object instead of going straight down? Posted: 24 Apr 2017 07:41 PM PDT For example, when pouring water from a mostly-full glass, it will cause the water to follow the side of the glass instead of fall perfectly down. Also, a sink will do the same to your arm, or finger. submitted by /u/sbundlab [link] [comments]

What happens with degenerate wave functions in an atom? Posted: 25 Apr 2017 07:36 AM PDT If a linear combination of some wave function that satisfies the Schrodinger equation for a given situation (for example, the electron in a hydrogen atom) also solves it, then there are multiple wavefunctions to describe one state. What happens to the electron with regards to this? What wavefunction does it assume? Does it matter? Thanks! submitted by /u/DanielDC88 [link] [comments]

My textbook says "a complete explanation of why entropy increases with increasing molar mass is beyond the scope of this book." Could someone explain to me why? Posted: 24 Apr 2017 11:40 PM PDT I'm learning general chemistry and currently on entropy. I thought a simple way of explaining it would be because atoms with higher molar mass have more subatomic particles within them which leads to more possible microstates. Instead my textbook says "the energy states associated with the motion of heavy atoms are more closely spaced than thsoe of lighter atoms. The more closely spaced energy states allow for greater dispersal of energy at a given temperature and therefore greater entropy." I do not completely understand what they mean by that explanation. What is the full reasoning behind why my textbook implies that it is much more complicated? submitted by /u/Hamster_Huey [link] [comments]

How do electrons "jump" to different energy levels without existing in-between the levels? Posted: 24 Apr 2017 06:58 PM PDT submitted by /u/xLittleMidgetx [link] [comments]

Why do the noble gasses have such a small gap between their melting and boiling points compared to other elements? Posted: 24 Apr 2017 07:06 PM PDT submitted by /u/cmiller1 [link] [comments]

Why did scientists in the '60's think that Mars was covered in vegetation? Posted: 24 Apr 2017 10:53 AM PDT Text from an article in Science Digest in 1963 Mars has pronounced seasonal variations, with the seasons about twice as long as those on earth, during which the surface temperature ranges from -120 to +30 degrees Celsius. When the northern hemisphere is in the "winter" season the dark green areas change to brownish gray. Based on this, we speculate that some simple form of life - lichens and mosses - is likely to exist on Mars. The reddish-orange areas show little color change with the seasons. And then later in the article: Most of the surface is desert consisting of granulated or powered iron oxide. A thin layer of vegetation covers about one-quarter of the surface, and a thin ice cap forms at the poles, the sides of both these regions changing with the seasons.... Full article here: http://imgur.com/a/Td5fK What changed in our knowledge of Mars over the years that these scientists were wrong about? submitted by /u/PyroNecrophile [link] [comments]

How deep are the atmospheres of the Jovian planets? Posted: 24 Apr 2017 02:01 PM PDT In gas giants, how deep do their atmospheres go? I understand that Jupiter will likely have a different atmospheric depth than say Uranus, so maybe it would be easier to express the values as a percentage of the radius of the planet. Additionally, what (if anything) would we find at their cores? submitted by /u/ewalls1 [link] [comments]

[Medical] How do they treat patients that are infectious enough to be dangerous? Posted: 24 Apr 2017 01:47 PM PDT Someone posted a while ago about seeing a biohazard room at a hospital where there were no visitors allowed and the doctors had to wear scrubs. It got me thinking- if a patient was sufficiently contagious, how would the doctors deal with it? How would they clean the room afterwards? If the patient died, what would they do with the presumably still dangerous corpse? submitted by /u/alderaanirebel [link] [comments]

The Fukang meteorite is estimated to be 4.5 billion years old, how is it that people manage to estimate its age? Posted: 25 Apr 2017 03:07 AM PDT I just wonder how it's even possible to date something to be that old, and based on what evidence would someone give it that estimate? http://www.dailymail.co.uk/sciencetech/article-2129747/The-beautiful-mysterious-Fukang-pallasite-meteorite.html EDIT: Added link submitted by /u/AdelZee [link] [comments]

If you had a large spherical radioactive sample, how much radiation would reach the surface? Posted: 24 Apr 2017 02:28 PM PDT Suppose you have a spherical sample with total activity of A0 decays/second, and an "activity-density" of A0/(4/3piR3). Further assume the direction of the radiation is uniformly distributed. Each photon released has a probability of e-x*u of reaching the surface due to Beer's law, where x is the distance the photon travels through the sphere. Since the sphere will absorb a significant portion of the radiation, the radiation emitted out of the sphere should be a lot less than the activity of the sample would suggest. Is there any analytical way of determining this, or must it be done numerically? submitted by /u/BaryonicM [link] [comments]

How is it that the concept of an Electromagnetic Field avoids the problems caused by the concept of a "Luminiferous aether" with regards to relativity? Posted: 24 Apr 2017 09:44 AM PDT When people talk about a "field that permeates all of space" I picture something either like a 3 dimensional grid, or like a liquid that fills up the universe. However, it seems that something like that would create a universal frame of reference with regards to the propagation of light, which the theory of relativity states does not exist. What's a better way to conceptualize a field to avoid this problem? (I apologize if this question makes no sense, I don't really understand this stuff at all) submitted by /u/xpersonx [link] [comments]

A year has Pi*10^7 seconds, where is the connection? Posted: 25 Apr 2017 01:03 AM PDT My mind got blown by this fact today .. but I can't see the connection between a year (orbit around the sun) and the number Pi*107. Can you help me? :) submitted by /u/ChowiexEU [link] [comments]

What makes mercury and gallium liquids at room temperature when elements around them on the periodic table are solids? Posted: 24 Apr 2017 11:03 AM PDT submitted by /u/nelcer [link] [comments]

How do bots bypass captcha? Posted: 24 Apr 2017 06:07 PM PDT submitted by /u/iDewTV [link] [comments]

Science or scam? "13 year old builds FREE energy device for under $15!" Posted: 25 Apr 2017 05:46 AM PDT If you google "13 year old free energy", you'll get about a bunch of news outlets reporting on this kid. Immediately red flags went up. We all know energy has to come from somewhere. There was a user a while ago that debunks this kind of thing. If anyone knows who they are and can tag them, that would be super. The news video claims " imagine this scaled up 20x." Currently, the kid is powering some LEDs with his device. If this is legit, I doubt it's going to scale appreciably. So, who wants to help figure this thing out? YouTube Link to video in question. submitted by /u/Kilo__ [link] [comments]

When we substract two natural numbers we get integers, when we divide two integers we get rationals, when we take roots of a positive rational we get reals, of a negative one we get complex. What is the next step? Posted: 24 Apr 2017 11:32 PM PDT submitted by /u/pedrodegiovanni [link] [comments]

Will internal combustion engines ever reach a point where they emit zero carbon dioxide? Posted: 24 Apr 2017 10:12 PM PDT Will internal combustion engines ever reach a point where they emit zero carbon dioxide? Is this even achievable? I say 'near' because the mining and refining of oil and gas isn't carbon neutral and probably won't ever be. Although I am aware of projects like the Shell Quest Carbon Capture project, that are aiming to sequester carbon in the earth rather than the atmosphere, I am still doubtful of ever achieving this. As a huge supporter of renewable energy and the growth in that field, I'm trying not to suffer from my own confirmation bias online and in the media... it's beginning to look like we are reaching a turning point for this technology that could be great for this planet. BUT..My gut feeling tells me that the most profitable companies in the world are oil and gas related, and will do anything to maintain the status quo. On top of that the U.S and the world in general is heavily invested in O&G, and has built infrastructure to transport it everywhere - that and the recent technological innovations in extraction have the potential to create an environment where Oil stays cheap. If it's cheap, it will prolong the adoption of greener energy. Anyways - this question has been on my mind for a few months now and I'm wondering if this is even possible. Will we ever have ICE's that are carbon neutral? Not sure what flair I should use, should his be under chemistry? Thanks!! submitted by /u/lvngstn [link] [comments]

Why the information paradox defies unitarity? Posted: 24 Apr 2017 02:43 PM PDT I am trying to understand the information paradox. Consider a wave function of two entangled particles, and one of them falls into a blackhole and reaches the singularity, since nothing is well defined there at that point the wave function looses information without having been collapsed, so far so good in term of understanding. This implies that unitarity is not conserved, and this is the part that I don't understand. Unitarity is the principle that the integral of the magnitude of the wave function in all space must be equal to one, and from that it follows that any operator times it's complex conjugate must be the Identity matrix, and I understand that (I can prove it), but I don't understand how nor why falling into the black whole and loosing information violates unitarity. Why can't there be a "black hole operator" which is unitary and that represents the changes made to the wave function?. If Unitarity is not preserved then, is it by being bigger or smaller than 1?, if it is smaller, does this mean that there is a chance of nothing happening?, if it is bigger, does that mean that something will definitely happen?, I can't really get my head around probabilities greater than 1. Thanks a lot submitted by /u/Frigorifico [link] [comments]

By treating genetically transferrable conditions, are physicians effectively allowing the passing-on of them, and possibly even lowering life expectancy long-term? Posted: 24 Apr 2017 09:08 AM PDT If so, why is life expectancy still on the rise? What are the ethical arguments for/against this? (i.e. survival of the fittest) submitted by /u/caramelcooler [link] [comments]

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