The moon rotates around its own axis at the same speed as its rotation around earth, which is why we don't see the "dark side". Is this purely coincidental or not?

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• The moon rotates around its own axis at the same speed as its rotation around earth, which is why we don't see the "dark side". Is this purely coincidental or not?
• If we could travel at 99.9% the speed of light, it would take 4 years to get to Alpha Centauri. Would the people on the spaceship feel like they were stuck on board for 4 years or would it feel shorter for them?
• What determines the speed of sound? Why is it not equal to the average speed of a particle in the given medium?
• Do electrons/energy build up at the entrance to the resistor?
• During warm periods in Earth's history (like the PETM or the Cretaceous), how much hotter were the temperature extremes as compared to today (which is around 56C)?
• Why was nuclear power originally researched?
• If you travel at 99,99% the speed of light, what happens to your cells while time appears to slow down?
• With underground nuclear explosions that create large craters with no above-ground material ejection, how is the cavity for the crater formed?
• How do we find the distance between the Earth and stars?
• What evidence is there that photons actually exist, as a particle?
• Do octopuses have dominant tentacles like people have dominant hands?
• How do you "catch a cold"?
• Is our atmosphere rotating with earth or is it stationary?
• How difficult would it be to drill into the Earth's Mantle, and what would we expect to find there?
• [Physics] If each particle is made up of 2,3,4 or 5 quarks and anti-quarks, Does that mean a particle of 12 quarks would be possible?
• On a particle level, what explains blackbody radiation?
• Is it possible that the space is also quantized?
• Do animals in the ocean have to worry about diseases as much as humans or animals on land?
• Any Jupiter experts out there?
• Are galaxies who are near one another or are neighbors, all around the same age?

The moon rotates around its own axis at the same speed as its rotation around earth, which is why we don't see the "dark side". Is this purely coincidental or not? Posted: 21 Jan 2019 06:41 AM PST I'm sure there's a logical explanation I'm not seeing, or is my interpretationof "dark side wrong? submitted by /u/ColonConoisseur [link] [comments]

If we could travel at 99.9% the speed of light, it would take 4 years to get to Alpha Centauri. Would the people on the spaceship feel like they were stuck on board for 4 years or would it feel shorter for them? Posted: 20 Jan 2019 06:57 AM PST submitted by /u/GPL89 [link] [comments]

What determines the speed of sound? Why is it not equal to the average speed of a particle in the given medium? Posted: 21 Jan 2019 06:51 AM PST Today I learned, that the average speed of gas molecules in the air is around 500 m/s (at a temperature of about 30° C). I thought soundwaves are particles bumping into each other progressively. This seems to be wrong of course... But what does determine the speed of sound, if not the average speed of the particles themselves? submitted by /u/Loenen [link] [comments]

Do electrons/energy build up at the entrance to the resistor? Posted: 21 Jan 2019 06:48 AM PST I know a resistor limits the amount of current that flows in a circuit, but does this cause a buildup of electrons, heat, or energy at the entrance of the resistor? submitted by /u/dtrickX [link] [comments]

During warm periods in Earth's history (like the PETM or the Cretaceous), how much hotter were the temperature extremes as compared to today (which is around 56C)? Posted: 20 Jan 2019 07:48 PM PST submitted by /u/xystonulexx [link] [comments]

Why was nuclear power originally researched? Posted: 21 Jan 2019 01:31 AM PST What was the original purpose for studying nuclear energy or nuclear fission? Was it to help man-kind originally, or was researched to create a new weapon? I am just trying to understand the historical purpose of nuclear energy and what the scientists had in mind when originally researching it. submitted by /u/mrbig1337 [link] [comments]

If you travel at 99,99% the speed of light, what happens to your cells while time appears to slow down? Posted: 20 Jan 2019 11:22 PM PST I am torn appart between the physics or biology tag... Let's say you travel at the speed of Light (close to it atleast) and it takes you 1 year in earth time. do your bodycells also slow down aging? Let's say a 90 year old cancer Patient wants to see his grandchildren graduate or marry, would he be able to slow down his cancer by going on a trip? submitted by /u/xFreakout [link] [comments]

With underground nuclear explosions that create large craters with no above-ground material ejection, how is the cavity for the crater formed? Posted: 20 Jan 2019 07:48 PM PST This was posted in another sub: http://i.imgur.com/wMOy7fz.gifv It seems as if the explosion is entirely contained underground, and a large cavity is created that collapses with little/no ejection of material. What causes this? Compaction of surrounding earth? Something about melting/vaporization? Unseen material ejection? submitted by /u/Hatsuwr [link] [comments]

How do we find the distance between the Earth and stars? Posted: 20 Jan 2019 11:00 PM PST We know Proxima Centauri is 4.2 light years away. We know Sirius is 8.6 light years away. How do we find and calculate these distances? submitted by /u/YashBarge [link] [comments]

What evidence is there that photons actually exist, as a particle? Posted: 21 Jan 2019 06:14 AM PST I've been thinking a lot about the electromagnetic spectrum and light lately, and I am having the damnedest of a time believing that there is an elementary particle called a photon. I can believe there is quantization of electromagnetic radiation at some hf. But this is just a fragment of a cycle of a wave - not a particle, just a short pulse of energy. And goes to the wave theory of electromagnetic radiation. Is this all that a photon is supposed to be? Is it a common lie told by physics teachers that photons are particles? Like how you were lied to when you learned that newtons laws guided everything,and then they told you later about Einstein's theories. A small lie to help you get started to understand what is going on before they hit you with the big math? Or is there indeed some irrefutable physical evidence of a truly massless chargeless particle called the photon? submitted by /u/AllenKll [link] [comments]

Do octopuses have dominant tentacles like people have dominant hands? Posted: 20 Jan 2019 04:00 PM PST Like, they always grab clams with that specific tentacle, or maybe it's a set of tentacles, like 4 of them are really good at everything and the other 4 are just there waiting to be useful. submitted by /u/Frigorifico [link] [comments]

How do you "catch a cold"? Posted: 21 Jan 2019 04:45 AM PST Like, why do you tend to fall sick if the weather is cold and you don't keep yourself warm enough? How do you explain it biologically? Wouldn't pathogens be less active in a cold environment? submitted by /u/marukori [link] [comments]

Is our atmosphere rotating with earth or is it stationary? Posted: 20 Jan 2019 05:58 PM PST submitted by /u/ReaIEIonMusk [link] [comments]

How difficult would it be to drill into the Earth's Mantle, and what would we expect to find there? Posted: 20 Jan 2019 02:24 PM PST I know the deepest hole ever drilled is something like 12km deep - the Kola Superdeep Borehole. But, with today's technology - is it possible (doesn't matter if financially viable) to drill into the Mantle? How would we know when we hit the Mantle, and would we find minerals previously undiscovered? submitted by /u/Contra_Bombarde [link] [comments]

[Physics] If each particle is made up of 2,3,4 or 5 quarks and anti-quarks, Does that mean a particle of 12 quarks would be possible? Posted: 20 Jan 2019 01:20 PM PST submitted by /u/pizayumyum [link] [comments]

On a particle level, what explains blackbody radiation? Posted: 20 Jan 2019 06:57 PM PST Temperature is just a measure of the system's total kinetic energy, which is related to the particles' speed. Why moving particles spontaneously emit photons, and what causes fast moving particles to emit at higher frequency? The distribution of the spectra is probably due to the statistical distribution of particle speeds, but please correct me if I'm wrong. For simplicity, you can consider the material to be a gas. submitted by /u/FRLara [link] [comments]

Is it possible that the space is also quantized? Posted: 20 Jan 2019 12:26 PM PST submitted by /u/noidontknowhy [link] [comments]

Do animals in the ocean have to worry about diseases as much as humans or animals on land? Posted: 20 Jan 2019 12:10 PM PST submitted by /u/numberfourdad [link] [comments]

Any Jupiter experts out there? Posted: 20 Jan 2019 09:55 AM PST What exactly is the "core" of gaseous planets made of? And how does that impact gravity of such planets? Do things just get denser and more compact? Is there a surface? And what's the latest understanding of that massive storm? I am mesmerized by its beauty but I don't understand its composition and formation. How did gasses coalesce in such a way? submitted by /u/Pie_fi [link] [comments]

Are galaxies who are near one another or are neighbors, all around the same age? Posted: 20 Jan 2019 06:55 AM PST Let's take the milky way for example. Are all galaxies near the milky way or in this area of space more or less of the same age? submitted by /u/SirHovaOfBrooklyn [link] [comments]

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Newtons second law of gravity and coulomb's law for electricity are almost the same. Why can electricity attract and repel, while gravity can only attract? Are we confident gravity doesnt repel anywhere in the universe?

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• Newtons second law of gravity and coulomb's law for electricity are almost the same. Why can electricity attract and repel, while gravity can only attract? Are we confident gravity doesnt repel anywhere in the universe?
• This is a thought experiment, but assuming the absence of nuclear fusion, is it possible for a star to be formed entirely from hydrogen? Would the star survive?
• What is the molecular level description/justification of the Bernoulli Principle?
• Why can’t you consume alcohol while on antibiotics?
• How is Kosher salt different from regular non-iodized salt other than crystal size?
• Why does spicy food make your nose run?
• If you were watching Earth from 100 million light years (or any other number) away, would you see a "livestream" of what happened in the past?
• If you fell into a black hole, wouldn't you cook you due to severely blue-shifted light?
• Will the Hyperloop see sonic booms?
• Why does heating up a magnet remove its magnetic pull?
• If only around 2% of our DNA codes for proteins, what is the function of the other 98% of our DNA?
• Are circumference lengths always an irrational number?
• Where or how do medical professionals get adrenaline for usage?
• How did scientists first determine the molar masses of different substances?
• What's the deal with these colour scales used in full sky temperature maps?
• When looking at an LED display, I can get it to do a Mexican wave by humming. Different pitches of hum cause the oscillation to speed up or slow down in frequency. No one else I know has ever been able to do this and people think I am mad. Has anyone else noticed this, and why might it happen?
• What is the smallest neutron bomb possible, and what would be the efficacy of such a targeted blast radius?
• How do the hairs on my arms, chest and legs know how long they are and to stop growing?
• If there are millions of asteroids entering Earth's atmosphere every day, and there quite a few man-made satellites orbiting Earth including the International Space Station, how is it possible they are not destroyed?
• How do heat-shrinking plastics work?
• Why is that heavy snow sometimes doesnt stick to the ground and build up and other times it does?
• What would the ramifications have been had Tsar Bomba been an underground test?

Newtons second law of gravity and coulomb's law for electricity are almost the same. Why can electricity attract and repel, while gravity can only attract? Are we confident gravity doesnt repel anywhere in the universe? Posted: 19 Jan 2019 06:09 PM PST submitted by /u/jcm0265 [link] [comments]

This is a thought experiment, but assuming the absence of nuclear fusion, is it possible for a star to be formed entirely from hydrogen? Would the star survive? Posted: 20 Jan 2019 02:01 AM PST submitted by /u/Terri23 [link] [comments]

What is the molecular level description/justification of the Bernoulli Principle? Posted: 20 Jan 2019 05:23 AM PST The below shouldn't be necessary to answering the title question, but will help with understanding where I'm coming from and what I mean. Feel free to skip over it. At university, I studied Chemical Engineering i.e. a lot of fluid flow. My desire to understand things at fundamental levels didn't always go hand-in-hand with the teaching nor the typical engineering mindsets, so I was never fully satisfied with some of the descriptions of reality that were offered. The unsatisfying description in question here is the Bernoulli Principle. I don't have a fluid dynamics textbook to hand, so I'm gonna go with Wikipedia here for the principle's definition with regards to just fluid velocity and fluid pressure: "...an increase in the speed of a fluid occurs simultaneously with a decrease in pressure..." I'm not denying that this happens under certain conditions, but it seems this statement doesn't apply to all conditions. For example, a water truck's water (presumably) has the same pressure when travelling at constant velocity of 40mph vs 60mph (it feels very counter intuitive to imagine there being some truck speed where the water pressure would drop to the water's vapour pressure and cause it to boil). We know that the principle does apply in the case of pipe fluid flow, for example in a venturimeter. So, what's the fundamental difference here vs the water truck example? Why does that difference lead to the difference in pressure behaviour, despite both being instances of changes in fluid velocity? I'm not denying the veracity of the first law of thermodynamics when I say this, and I realise that the Bernoulli equation is essentially an energy balance, but I don't think "it's because of the energy conservation on/within the fluid" is actually an answer to what is fundamentally happening and doesn't address the difference. Rather, that statement serves as more of a heuristic that allows us to easily figure out the state of the system. But, the universe doesn't just adjust the pressure when the velocity increases so that the total energy change is zero, instead there are other processes at play, the net/emergent/observable result of which is that the total energy change is zero. This result is more convenient to work with in most instances, but doesn't necessarily allow you to work backwards to what actually took place "behind the scenes", which is what I'm wanting to do here. To understand why we observe the pressure dropping when the velocity increases in some cases and not in others, I think a Kinetic Theory style molecule level description of fluid pressure needs to be applied. If we could perfectly describe a fluid as a system of individual molecules that interact with one another according to their individual molecular properties and states, and simulate it according to Newton's laws of motion, I imagine you would see the Venturi effect/Bernoulli principle emerge in certain cases without even needing to explicitly program that behaviour into the simulation. So... What is the molecular explanation of the Bernoulli Principle? submitted by /u/Craigy100 [link] [comments]

Why can’t you consume alcohol while on antibiotics? Posted: 19 Jan 2019 07:42 PM PST submitted by /u/pgh77 [link] [comments]

How is Kosher salt different from regular non-iodized salt other than crystal size? Posted: 19 Jan 2019 07:05 PM PST This is really more of a food science question but I feel chemistry is the right tag since a 'food science' flair doesn't exist. Are there other trace metals that lower the sodium content like Himalayan salt? Or am I missing the reason people pay more money for a larger, less refined crystal of the same chemical composition (it's not like they're diamonds) submitted by /u/MattyMattsReddit [link] [comments]

Why does spicy food make your nose run? Posted: 19 Jan 2019 06:06 PM PST submitted by /u/outofideasforusernam [link] [comments]

If you were watching Earth from 100 million light years (or any other number) away, would you see a "livestream" of what happened in the past? Posted: 20 Jan 2019 07:09 AM PST Perhaps my question isn't entirely clear so let me explain my thought. If light takes 100 million years to travel to a distant location, the person watching Earth from that point (assuming they have some sort of super hi-tech telescope) would see what happened 100 million years ago. But it's not just one moment of light that travels the distance, but a sequence of light, a new picture with every second so to speak. So would a person from afar actually see what happened here 100 million years ago sort of like in a video? submitted by /u/tijuanatitti5 [link] [comments]

If you fell into a black hole, wouldn't you cook you due to severely blue-shifted light? Posted: 20 Jan 2019 04:18 AM PST This is assuming, of course that you're falling into a black hole big enough that the tidal forces aren't ripping you apart as well. submitted by /u/Ycarusbog [link] [comments]

Will the Hyperloop see sonic booms? Posted: 20 Jan 2019 02:47 AM PST Since the Hyperloop concept is to operate high speed trains in a near-vacuum tunnel, I was wondering if they can reach the speed of sound and if it can, will there be a sonic boom? submitted by /u/mistborn101 [link] [comments]

Why does heating up a magnet remove its magnetic pull? Posted: 19 Jan 2019 04:42 PM PST I just watched a video by The King of Random, in which he heated a powerful neodymium magnet to about 1800° and checked to see if it still attracted metal, which it did not. He also tried heating the metal instead of the magnet, with the same result. The metal, once it cooled down, started attracting to magnets again. But the magnet, even cooled back to room temperature, did not attract metal anymore. It had permanently lost its magnetism. My question is: Why? Why did heat affect the magnetism, and why did the metal regain it's ability to be attracted to magnets, but the magnet lost its properties permanently? submitted by /u/Roundtable_Rival [link] [comments]

If only around 2% of our DNA codes for proteins, what is the function of the other 98% of our DNA? Posted: 19 Jan 2019 07:42 PM PST submitted by /u/feedman223 [link] [comments]

Are circumference lengths always an irrational number? Posted: 20 Jan 2019 04:33 AM PST If π is an irrational number, and thus cannot be represented as a fraction, and the circumference length c = 2πr, then π = c/2r, which is a fraction representation. Does this mean that a circumference length is always irrational as well? submitted by /u/vapocalypse52 [link] [comments]

Where or how do medical professionals get adrenaline for usage? Posted: 19 Jan 2019 05:27 PM PST submitted by /u/Airican [link] [comments]

How did scientists first determine the molar masses of different substances? Posted: 19 Jan 2019 02:10 PM PST To elaborate a bit on my question: when for example it was first discovered that the molar mass of water was roughly 18.015g/mol, how did they know for sure that they at that time were weighing the exact amount of water molecules that go into 1 mole? Or in case they calculated it from a smaller sample of particles where they knew the exact amount of particles and what they weighed, how did they determine exactly how many particles were in the sample? More generally I guess I'm asking is, how do you determine the exact amount of particles of any substance that you have in a container at a given point? I hope I phrased this somewhat understandably and not too convoluted. I wasn't sure how to put it in different words. submitted by /u/Bawrosaurus [link] [comments]

What's the deal with these colour scales used in full sky temperature maps? Posted: 20 Jan 2019 01:11 AM PST Reading about the cosmic microwave background I stumbled upon these full sky temperature maps and the first thing that confused me is the scaling scheme. How to use the same colour (white) two times on the same colour scale? https://imgur.com/a/9K5xkZd Source: https://arxiv.org/abs/1807.06205, page 4: "Fig. 1. Fluctuations of the sky emission in each of the nine Planck frequency bands, after removal of a common dipole component. The fluctuations are expressed as equivalent temperature variations at each of the seven lowest frequencies, so that fluctuations with a thermal spectrum will appear the same in each map (except for the effects of the varying resolution of the maps). The highest frequencies, which monitor the dust emission, are expressed in more conventional units." submitted by /u/zetastratus [link] [comments]

When looking at an LED display, I can get it to do a Mexican wave by humming. Different pitches of hum cause the oscillation to speed up or slow down in frequency. No one else I know has ever been able to do this and people think I am mad. Has anyone else noticed this, and why might it happen? Posted: 19 Jan 2019 08:53 AM PST Clarification- the oscillation is only visible in my eyes, I cannot physically effect the display itself! submitted by /u/HerbziKal [link] [comments]

What is the smallest neutron bomb possible, and what would be the efficacy of such a targeted blast radius? Posted: 19 Jan 2019 10:58 AM PST submitted by /u/FrozenCaveMoose [link] [comments]

How do the hairs on my arms, chest and legs know how long they are and to stop growing? Posted: 19 Jan 2019 10:55 AM PST If i shave them off, they instantly start growing back, so they must have some idea of how long they are. What's going on? submitted by /u/fizdup [link] [comments]

If there are millions of asteroids entering Earth's atmosphere every day, and there quite a few man-made satellites orbiting Earth including the International Space Station, how is it possible they are not destroyed? Posted: 19 Jan 2019 09:53 PM PST I also wanted to add that since the Moon is peppered with craters, I would think that the chances of asteroids hitting anything we send into space is high, what is your thought? submitted by /u/Banditteer [link] [comments]

How do heat-shrinking plastics work? Posted: 19 Jan 2019 06:03 PM PST If heat makes substances expand at a molecular level and cold makes substances contract, how do heat-shrinking plastics work? I know that water expands as it freezes into ice because of the organization of the molecules into a crystalline structure, but I'm sure it isn't the same mechanism in reverse. (Maybe I'm wrong?) TIA! submitted by /u/Kokopelli615 [link] [comments]

Why is that heavy snow sometimes doesnt stick to the ground and build up and other times it does? Posted: 19 Jan 2019 03:10 PM PST submitted by /u/badlyoff93 [link] [comments]

What would the ramifications have been had Tsar Bomba been an underground test? Posted: 19 Jan 2019 11:23 AM PST So the Soviets designed the largest bomb possible (100 Mt), then cut it in half, then detonated the largest bomb ever detonated (50 Mt) in the atmosphere. What would have happened to the planet had the Soviets buried the bomb in the Earth's crust? Could it have penetrated all the way through the crust? What would life look like on the planet had they done this, whether with the 50 or the 100 megaton model? submitted by /u/MississippiJoel [link] [comments]

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Asked my chemistry teacher (first year of highschool) this "Why do we use the mole (unit) instead of just using the mass (grams) isn't it easier to handle given the fact that we can weigh it easily? why the need to use the mole?" And he said he "doesn't answer to stupid questions"

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• Asked my chemistry teacher (first year of highschool) this "Why do we use the mole (unit) instead of just using the mass (grams) isn't it easier to handle given the fact that we can weigh it easily? why the need to use the mole?" And he said he "doesn't answer to stupid questions"
• Is the distance between atoms in a molecule like hydrogen gas constant? If yes, how is it kept constant?
• Do people with CIPA (insensitivity to pain) not experience things such as headaches or stomach cramps that occur within the body or are they only immune to pain exerted by external factors?
• What position of earth relative to the sun has humanity deemed the end/beginning of a calendar year?
• simple questions regarding air pressure?
• Why some stars in the night sky look like they are changing colours or flashing light rapidly?
• If a neutron is more massive than a proton, and a proton turns into a neutron when shedding a positron, does that mean that a positron has negative mass?
• What happens to quarks and the nucleus after the quark escapes it? (QCD)
• How does thermoacoustic engines work? How can they cool things down? Where does the excess heat go to?
• If there was a filter with holes the size of water molecules would water be able to go through the filter considering surface tension?
• Why does ”disturbing” near-freezing water cause an immediate phase change?
• why can many animals only mate during a specific time frame in the year, whereas humans can mate almost all year round?
• How did grass “colonize” the earth?
• In the example of a raised pendulum having potential energy and a swinging pendulum having kinetic energy...what happens to the stored energy if you never release the pendulum?
• Why are most of the biggest land animals herbivores?
• During a glacial period, when sea levels are dropping, would ocean salinity be significantly higher?
• Does compression effect the electrical conductivity of a material?
• Why is the joint near your fingernail not considered a knuckle? What defines a knuckle?
• Does the placebo effect work in reverse?
• Is E=MC(2) a vector? In other words does it require Motion to work?
• Does a group of people yelling at the same time make the sound travel farther than one person yelling?
• How do centrifugal governors regulate speed to a constant rather then oscillating speed?

Asked my chemistry teacher (first year of highschool) this "Why do we use the mole (unit) instead of just using the mass (grams) isn't it easier to handle given the fact that we can weigh it easily? why the need to use the mole?" And he said he "doesn't answer to stupid questions" Posted: 19 Jan 2019 06:17 AM PST Did I ask a stupid question? submitted by /u/Onigiri22 [link] [comments]

Is the distance between atoms in a molecule like hydrogen gas constant? If yes, how is it kept constant? Posted: 19 Jan 2019 05:19 AM PST I read in a high school chemistry textbook that the distance between the protons of a H2 (hydrogen-gas) molecule is constant. It didn't explain why. It confuses me, as I always thought, since the electrons are constantly moving the coloumbic force on the nuclei should force like a tandem motion. At least it's what I always imagined that they all hold each other in place like they're connected by jelly strings. submitted by /u/anearneighbor [link] [comments]

Do people with CIPA (insensitivity to pain) not experience things such as headaches or stomach cramps that occur within the body or are they only immune to pain exerted by external factors? Posted: 18 Jan 2019 03:56 PM PST submitted by /u/Soggy_thoughts02 [link] [comments]

What position of earth relative to the sun has humanity deemed the end/beginning of a calendar year? Posted: 18 Jan 2019 11:04 PM PST Now I understand that we'll need another reference point so say you're looking at a top view of the solar system and "North" or 0° is pointing to the center of our galaxy, what is the relative position of earth to the sun on new years day? An obscure question that came into my head today that I'd thought I'd ask. submitted by /u/jpettyjhawk [link] [comments]

simple questions regarding air pressure? Posted: 19 Jan 2019 04:06 AM PST 📷 not sure if i understand air pressure properly can someone correct my statements below if they are wrong... air pressure is caused by air's instrinsic property of wanting to expand (much like water but it expands at a much faster rate). Cold air expands slower than warm air thus cold air has a lower pressure than hot air. in an experiment where you place an air balloon with in a fridge, the balloon becomes flaccid and deflates due to a decrease in the air's activity; however, when it returns to room temperature, the balloon eventually returns to its original shape; that i understand, however my problem is that within the fridge doesn't the external pressure decreases due to its coldness and this balance of temperature within and without would achieve a pressure equilibrium in & out of the balloon and would leave the balloon inflated? someone correct the way i think about this. thanks submitted by /u/HREisGrrrrrrrreat [link] [comments]

Why some stars in the night sky look like they are changing colours or flashing light rapidly? Posted: 18 Jan 2019 07:17 PM PST I just saw one today in the clear night sky and was wondering. Sorry if it's a silly question. Thanks! submitted by /u/thearcher122 [link] [comments]

If a neutron is more massive than a proton, and a proton turns into a neutron when shedding a positron, does that mean that a positron has negative mass? Posted: 19 Jan 2019 12:01 AM PST When atoms shed a positron from the nucleus, one of the protons changes to a neutron, and the reverse happens when an electron is shed. If the latter reduces the mass of the atom by the mass of an electron, since the mass of a proton added to that of an electron equals the mass of a neutron, then does an atom that sheds a positron gain mass? submitted by /u/PhenomenalPancake [link] [comments]

What happens to quarks and the nucleus after the quark escapes it? (QCD) Posted: 19 Jan 2019 03:02 AM PST Hi, (Not a physicist by any means, just a fan) After watching Dr. Don Lincoln's video about quantum chromodynamics I was left with a bunch of questions, was wondering if someone could please help clear a few things up :) : He describes the strong nuclear force as being similar to a rubber band in such a way that the farther the quarks get from each other the stronger the force pulling them back together becomes - is there a specific terminal distance where the force stops applying (or starts getting weakr again) ? Do we know how to calculate it? He talks about what happens when we knock a quark hard enough out of a nucleus, and as a result some energy becomes matter-anti matter pairs and a "jet" happens - I'm wondering what happens after? does one of those newly formed quarks get sucked in inside the nucleus making it stable (white) again? or does the original quark somehow return? I can't imagine the nucleus staying with only 2 quarks, can it? and what happens to the original knocked quark? does it get annihilated with one of the anti quarks created? or does it just go on? are lonely quarks outside of nucleus a thing we observe? if so how do they interact with other matter considering they have color charge? Thanks! submitted by /u/wutalman [link] [comments]

How does thermoacoustic engines work? How can they cool things down? Where does the excess heat go to? Posted: 19 Jan 2019 06:27 AM PST submitted by /u/raffbr2 [link] [comments]

If there was a filter with holes the size of water molecules would water be able to go through the filter considering surface tension? Posted: 19 Jan 2019 05:31 AM PST submitted by /u/Mythical_NZer [link] [comments]

Why does ”disturbing” near-freezing water cause an immediate phase change? Posted: 18 Jan 2019 06:57 PM PST I'm a biologist working in clinical research related to the abnormal microbiome in stem cell transplant patients. In developing our current protocol, we've been freezing small plastic vials containing 1ml of water (in place of actual human bio matter, for the time being). Often I'll check on them after they've been in the freezer for hours, and they will be cold but not frozen — until I "disturb" the water by tilting the vial, at which point the water will immediately freeze. This is fascinating to me! What causes this? And for bonus points, can anyone tell me how to calculate how long it should take for 1ml of fresh water to reach a frozen state in the average person's freezer? My physics is pretty rusty... submitted by /u/vaginamancer [link] [comments]

why can many animals only mate during a specific time frame in the year, whereas humans can mate almost all year round? Posted: 18 Jan 2019 05:12 PM PST Title. Thanks :) submitted by /u/hhitch_ [link] [comments]

How did grass “colonize” the earth? Posted: 18 Jan 2019 03:58 PM PST submitted by /u/rexoslicer1 [link] [comments]

In the example of a raised pendulum having potential energy and a swinging pendulum having kinetic energy...what happens to the stored energy if you never release the pendulum? Posted: 18 Jan 2019 06:34 PM PST I have always had trouble with this part of basic mechanics. I know that, in the case of pumping water up a hill, the stored potential energy is very close to literally storing energy. The amount of energy can be easily calculated, and the energy can be easily retrieved and used. But the thing is...what if your water tank or your pendulum is raised up, but simply never allowed to fall again? Is the energy "locked" in the object forever, with the object literally having or possessing literal extra energy, stored by it having been lifted, which it just has forever? I would assume yes, if we're talking about a water tower that is filled, and then left alone for an arbitrary length of time. If the tank doesn't physically decay and leak, you could come back in a thousand years, and use the water pressure to do work. So, in that case, the energy really is stored forever. But other versions of the analogy do not seem as clear. The very first time I heard of potential and kinetic energy, my elementary school textbook used an illustration of a guy preparing to swing on a rope, like Tarzan. The dude up on a tree limb, preparing to swing was the example of potential energy, and the motion-blurred picture of him actually swinging was the example of kinetic energy. Here's the thought experiment that popped into my head, when I was nine (even though I didn't know that's what I was doing). Imagine that our Tarzan guy climbs up to his tree limb, to load up potential energy for his swing. He's getting ready to swing, all filled up with apparently literal potential energy...but then (just at the point where he's poised to initiate that transfer from potential to kinetic energy) he notices something behind him, at the exact same height as the tree limb he's perched on: a mesa or plateau, with a pretty little town just down a dirt road. All he has to do is decide to let go of the vine, step onto the road, and go for a short walk, to explore this village he's never seen. Okay, so let's imagine that he not only lets go of the vine, and walks to the town, let's say that he really likes the town, gets a job, takes a wife, raises children, grows old, dies, and gets buried on that mesa, never once coming down from the height he originally climbed to, either by swinging vine, or by any other means. Okay, so precisely what happened to that potential energy that was going to be kinetic energy when he was going to swing on the vine, but decided not to actually do it? Did it dissipate as heat or sound? Did he literally carry it with him, as some kind of theoretical (or literal???) energy, all his life? Is it still there in his corpse, buried beside his wife, on the mesa? I kind of feel that answer has merit, because if you dug him up and tied his remains to the vine, he would totally swing off. And where else could the energy for swinging have come from, but from when he carried himself up onto the mesa, to begin with? Or is this all a stupid analogy, because gravity is accelerating us, and it isn't the climb up the hill that "gives" the energy to the swinger, but gravity pulling him down? In that case, it wouldn't be the energy he "brought" with him up the hill that would allow his dead body to swing off of it, 50 years later. See how confused I am? Help. I've been confused about this for pretty much all my life now, and it's starting to irritate me. Can you clear this up for me? I want to have a better understanding of kinetic and potential energy, before my child-self's thought experiment becomes literally 30 years old. submitted by /u/Noxalk [link] [comments]

Why are most of the biggest land animals herbivores? Posted: 18 Jan 2019 03:35 PM PST Elephants must spend like 80% of their lives just eating because the foot they eat is so low in calories. Meat is a lot more nutrient-dense than plants and high in calories and protein. So why are so many of the largest animals that need the most sustenance herbivores? submitted by /u/FeelThePower999 [link] [comments]

During a glacial period, when sea levels are dropping, would ocean salinity be significantly higher? Posted: 18 Jan 2019 04:05 PM PST Assuming my understanding of glaciation is correct. When sea water evaporates the salt is deposited. Because that water is lost to snow and ice, sea levels drop. That would seem to imply that ocean salinity should be higher given a reduced volume of water. If that's the case... Is that increase significant? Is there any geological or biological evidence of this? Would the opposite be true as glaciers continue to retreat and the global sea level rises? Would the effects be more or less significant? submitted by /u/Ampatent [link] [comments]

Does compression effect the electrical conductivity of a material? Posted: 18 Jan 2019 06:04 PM PST Not necessarily to the point of trauma, but does pressure alter the flow of electrons through, let's say, copper in any meaningful way? submitted by /u/Kirbs_McGurbs [link] [comments]

Why is the joint near your fingernail not considered a knuckle? What defines a knuckle? Posted: 18 Jan 2019 03:45 PM PST submitted by /u/strangebabydog [link] [comments]

Does the placebo effect work in reverse? Posted: 18 Jan 2019 07:43 AM PST If you were to strongly believe that a functional medicine would not work, would it be less effective? submitted by /u/Grindylow2 [link] [comments]

Is E=MC(2) a vector? In other words does it require Motion to work? Posted: 19 Jan 2019 05:09 AM PST submitted by /u/anynametaken [link] [comments]

Does a group of people yelling at the same time make the sound travel farther than one person yelling? Posted: 18 Jan 2019 11:02 AM PST If yes, if everyone in the U.S. were all to gather on the beaches of Miami and all yell at the same time, will it travel far enough that people in Cuba will hear it? submitted by /u/aktright [link] [comments]

How do centrifugal governors regulate speed to a constant rather then oscillating speed? Posted: 18 Jan 2019 09:57 AM PST Shouldn't a centrifugal governor constantly be oscillating around a stable point but not actually achieve it? If that were the case why don't tractor engines that use these sound like engines that are revving and releasing? ​ https://en.wikipedia.org/wiki/Centrifugal_governor submitted by /u/Towns10 [link] [comments]

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