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Sunday, June 19, 2016

Why is it that I can't seem to find any pictures of molten Carbon? Is it particularly difficult to melt Carbon?

Why is it that I can't seem to find any pictures of molten Carbon? Is it particularly difficult to melt Carbon?


Why is it that I can't seem to find any pictures of molten Carbon? Is it particularly difficult to melt Carbon?

Posted: 19 Jun 2016 03:01 AM PDT

If adding a proton to an element turns it into another element, Why can't there be unlimited amounts of elements?

Posted: 18 Jun 2016 04:28 PM PDT

Someone told me they fell apart after some point, but I'm asking why and how.

submitted by /u/kittymowmowmow
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Can dogs tell the difference between male and female humans, either by sight or smell? If so, do they behave differently towards men and women?

Posted: 18 Jun 2016 10:26 AM PDT

Do proton pumps transfer actual protons across a membrane or do they transfer hydronium ions?

Posted: 18 Jun 2016 08:23 PM PDT

How is the rotational velocity of a Kerr Black Hole measured?

Posted: 19 Jun 2016 06:15 AM PDT

Is there even a way to measure it to a substantial degree of certainty? Are there other ways to measure it than through the gravitational lensing effect on photons?

submitted by /u/HappyFeetM
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Is it possible to have potential energy but be at 0 potential?

Posted: 19 Jun 2016 06:13 AM PDT

Imagine we have a positive test charge in between 2 oppositely charged spheres. At the point exactly between them, the potential should be 0. However I think that the test charge would still move (towards the negative one and away from the positive), meaning it must have potential energy. How is it possible for it to have some potential energy yet be at 0 potential, defined as potential energy per unit charge? There must be a flaw somewhere but I'm not sure which bit of my thinking is wrong

submitted by /u/wickedel99
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Are there any other scalar fields besides the Higgs field that can spontaneously break gauge symmetries?

Posted: 19 Jun 2016 06:47 AM PDT

Why does thermal radiation exist if atoms are neutral in charge?

Posted: 18 Jun 2016 11:23 PM PDT

My understanding of thermal radiation is that every atom acts as a tiny oscillating dipole because it contains an oscillating charge. But wouldn't the magnetic fields created by the nucleus cancel out the fields produced by the electrons?

submitted by /u/MANBEARPIGofPersia
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How do Planck Length, Planck Time, and Planck Temperature relate to each other? Is there a formula that ties them together? Is it possible there could be?

Posted: 18 Jun 2016 11:09 PM PDT

I have been thinking about this for a while, and I'm pretty curious. I love thinking about Planck Lengths, and stuff. Pretty cool stuff!

submitted by /u/Noerdy
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I'm aware that bees produce honey and aphids make honeydew. Are there other examples of other insects or other animals turning raw ingredients (like nectar or sap) into some other substance? Is there an overarching name for what these products are called?

Posted: 18 Jun 2016 01:23 PM PDT

Can the wavefunction of a particle be considered as a probability density function of a continuous random variable?

Posted: 18 Jun 2016 08:10 PM PDT

From Max Born, the postulation is that the square of the amplitude of a wavefunction gives the probability of a particle existing at a position x at a time t, but from a mathematical point of view can we not consider wavefunctions as simply probability density functions and apply integration to determine the probability of a particle existing within set parameters? Is that impossible to do, or more difficult? Why do we use the square of the amplitude?

submitted by /u/Punjabicide
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If the orbits of Mercury and Venus were visible in broad daylight as rings around sun, how far across the sky would the rings stretch?

Posted: 18 Jun 2016 10:07 AM PDT

What exactly causes hypoglycemia / diabetic coma in diabetic patients?

Posted: 18 Jun 2016 01:43 PM PDT

Aside from too much antiglycemics / insulin relative to blood glucose levels. I have seen many diabetic patients that do not follow a med regimine at all yet will drop to dangerously low levels. What causes this? Can a non diabetic person experience a "diabetic coma"? If not, why?

Thanks!

submitted by /u/hellisempty
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Why isn't Hawking Radiation Power proportional to the Surface Area of Event Horizon of a Black Hole?

Posted: 19 Jun 2016 03:25 AM PDT

Why does a solar mass blackhole only radiate ~10-29 Watts while a 105 kg blackhole emanates ~1021 Watts.

submitted by /u/ansariddle
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If the Earth's atmosphere were 20% thicker would that be a boon or a burden for fixed-wing aircraft?

Posted: 18 Jun 2016 11:15 AM PDT

All other things being equal, if you took a modern jet or turboprop plane and plopped it into an atmosphere with the same gas composition but 20% thicker would that make the unmodified lifting surfaces more efficient? Less efficient? About the same?

Setting aside any effects that thicker air would have on the efficiency of the combustion process in the engines (let's just say we can provide the same amount of power), would the plane have to work harder to push through the denser air and/or overcome drag?

submitted by /u/Xeglor-The-Destroyer
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Are there any species where their gender birthrate isn't 50% male and 50% female?

Posted: 18 Jun 2016 08:40 AM PDT

Do animal parents count their children to check whether they're all with them? "One, two, three, four, five, six. Check."

Posted: 18 Jun 2016 08:47 AM PDT

Here's an illustration: https://redd.it/4o1kcx.

submitted by /u/joker38
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Why has Titan retained its atmosphere?

Posted: 18 Jun 2016 10:56 AM PDT

At 0.14g and without its own magnetosphere why hasn't Titan been stripped of its atmosphere by the solar winds, jeans escape, and other similar atmospheric escape mechanisms?

submitted by /u/28thApotheosis
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Breaking a perfect rope?

Posted: 18 Jun 2016 11:10 PM PDT

I have a rope and I pull it, of course it will break at it's weakest point. Now somehow I made a perfect rope (at atomic level), it's the same (hardness, density,...) everywhere and I pull it again. What will happen? It's unbreakable, or get splitted into atom, or just simply breaks at random places?

submitted by /u/DogeoftheShibe
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Can the nuclear force hold two protons together without violating the Pauli exclusion principle?

Posted: 18 Jun 2016 10:46 AM PDT

So since the nuclear force has a spin dependent component the force between two protons with anti-aligned spins should be too low to hold them together.

So that means that the only way for two protons to be bound to each other would be if their spins were aligned, but wouldn't this violate the Pauli exclusion principle as they'll both be in the same quantum state?

Is it even possible for two protons to be bound together, or is it just the neutron(s) and proton(s) being bound together to keep a nucleus together?

submitted by /u/vRobinn
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What exactly is p in E^2 = (m^2)(c^2) + (pc)^2?

Posted: 18 Jun 2016 07:00 PM PDT

I know it means momentum, but what momentum exactly? The momentum of one or both of the colliding objects? I saw "change in momentum in the system" somewhere, but in what way and to what extent does the momentum change? Can it, or is p always 0?

submitted by /u/Oliver5366
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Saturday, June 18, 2016

Is it possible to create 100% vacuum?

Is it possible to create 100% vacuum?


Is it possible to create 100% vacuum?

Posted: 18 Jun 2016 03:57 AM PDT

Is it at all possible to create 100% vacuum here on earth, if yes. then how?

submitted by /u/rick_dick_ulous
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Can the pressure change of inserting a known quantity of gas into a sealed container be used to calculate the volume of the contents of the container?

Posted: 17 Jun 2016 07:00 PM PDT

So it's really easy to calculate the volume of an object. You just dip it into a filled tub and see how what volume of water comes out. this is called hydrostatic weighing

I'm curious whether a different method could be used. Could a quantity of gas be put into a sealed container of known (empty, tared) volume, and the change in pressure used to calculate how much extra stuff is in the container?

is this practical? How sensitive are pressure meters? how much gas would have to be used? could air be used?

EDIT: while waiting for moderation I found this - https://en.wikipedia.org/wiki/Air_displacement_plethysmography it's actually the application I was thinking of, and lists all the downsides :) Pretty cool that someone has thought of all this and it's amazing to see almost 100 years of work done along some thoughts you just had :) :) What's also interesting is the large effect that the temperature change has, so that I suppose it has to be done quickly. One thing though is that it seems to apply much better to something other than a human subject, since human subjects are warm and damp, changing the conditions during testing (unless it's done quickly). It would seem like an ideal way to quickly measure the volume of a small hard object that you don't want to submerge in water...I'm curious about the generalization of this technique.

submitted by /u/hezwat
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How can any tumor be benign? Isn't all cancer an uncontrolled growth of cells? Why doesn't that fit the definition of all tumors?

Posted: 17 Jun 2016 04:18 PM PDT

Does the density of a material have any relation with its thermal conductivity?

Posted: 18 Jun 2016 07:31 AM PDT

If it does, why?

submitted by /u/Spaffy_Waffle123
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How do parity bits work?

Posted: 17 Jun 2016 11:49 PM PDT

I mean in a Raid array. I know it's a way of being able to rebuild an array by figuring out what the data was. But like how does that work? It's kinda like an Uber form of compression given in an 8tb array: they'll be 6tb of usable space and 2tb for parity space.

submitted by /u/piexil
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Can we calculate how long it would take an object, moving in space, to stop on its own?

Posted: 17 Jun 2016 09:27 AM PDT

I learned today that space is not a complete void, and in fact, creates friction (however minute) for objects moving through it due to gas, dust, etc...

Assuming a spherical object is moving at 100mph in space, and elements such as gravity from nearby objects are not a factor, is it possible to calculate how long an object would need to travel before being slowed to a halt via friction alone?

submitted by /u/NathanielGarro-
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[Gravitation] Why does Newton's law of G apply normally to point masses and uniform spherical masses...?

Posted: 18 Jun 2016 06:21 AM PDT

...but (according to a textbook) if the objects involved are neither point masses nor spherical masses, the formula is still applicable if the objects are placed sufficiently far apart such that their sizes become negligible compared to the distance.

I kind of get it, but how do you explain it in detail? Also, I'd have thought that it is the relative sizes of the objects that makes a space shuttle be treated as a point mass due to its relative small size compared to Earth, rather than its distance from it.

Edit: It's hard to phrase the question in its entirety due to the word limit and 'question mark in title' rule.

submitted by /u/STorrible
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Can someone explain bernoulli's principle?

Posted: 17 Jun 2016 08:18 AM PDT

I am supposed to use it for a project but I can only find complex explanations. Not sure if this is the correct subreddit.

submitted by /u/SpikeSpiegelGod
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Where do our stomachs' get the Chlorine to make hydrochloric acid?

Posted: 17 Jun 2016 09:50 AM PDT

Why does a positive multiplied by a negative equal a negative?

Posted: 17 Jun 2016 03:17 PM PDT

Is there some form of proof for this?

submitted by /u/3dpony
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How fast would the earth have to spin for the centrifugal force to keep a 12 m rope streched if bound to the ground?

Posted: 17 Jun 2016 02:26 PM PDT

What's the difference between a granuloma and a cyst?

Posted: 17 Jun 2016 11:11 AM PDT

What are the effects of pineal gland calcification?

Posted: 17 Jun 2016 08:24 AM PDT

Why does the color wheel seem continuous to our eyes?

Posted: 17 Jun 2016 07:54 AM PDT

The actual spectrum of light visible to human eyes is linear, starting at red and ending in violet (from low frequency to high frequency). How, then, are my eyes processing a color wheel, which manages to loop from violet back to red in a seemingly seamless way?

submitted by /u/Milsivich
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Will a 20% chance become a 100% chance after five times in this situational?

Posted: 17 Jun 2016 07:15 AM PDT

Hello, my friend and I have been scratching our heads over this for some time now.

There are five cans on a fence and each round, 1 is knocked off at random. At the start of each round all cans get reset. If this continues for 5 rounds, will the chance for one can to get knocked off be greater than one that has already been knocked off?

I know that in reality, there will always be a 20% chance amongst all of them but is there some sort of law or theory that i'm not considering here?

Thank you in advance!

submitted by /u/Choppedporks01
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Is it possible that we live inside the event horizon of huge black hole, but we just havent realized?

Posted: 17 Jun 2016 11:35 AM PDT

Why is a >0.5 W laser a diffuse reflection hazard when the diffuse reflection's radiance is significantly less than that of a household light bulb?

Posted: 17 Jun 2016 07:35 AM PDT

According to the standard laser class system and safety guidelines, class 4 lasers (above 0.5 W) are a diffuse reflection hazard. I must be missing something, because both the radiance and irradiance of even a 10 W laser's diffuse reflection is no more than that of a standard 60W incandescent (~10 W in the visible range), which also emits uniformly in all directions. What am I missing? A 10 W laser is universally seen as an acute diffuse reflection hazard. Note that I don't think it can have anything to do with the coherent nature of laser light because the coherence is lost in a diffuse reflection.

(Note: I posted this question in /r/lasers yesterday but haven't gotten any responses over there)

submitted by /u/ButWhoIsCounting
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Friday, June 17, 2016

We have hot air balloons, and helium balloons but why not hot helium balloons?

We have hot air balloons, and helium balloons but why not hot helium balloons?


We have hot air balloons, and helium balloons but why not hot helium balloons?

Posted: 17 Jun 2016 03:54 AM PDT

I know that suggesting Hot Hydrogen is a no-no, but wouldnt heating helium provide more lift than traditional methods or is there something I am missing here? I know heating helium would not be as simple as heating air obviously, but Im sure there is a way.

submitted by /u/dredawg1
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Instead of other animals transmitting diseases to humans.. what diseases can humans transmit to other types of animals?

Posted: 16 Jun 2016 09:21 PM PDT

Will the asteroids in the asteroid belt eventually clump together and form another planet?

Posted: 17 Jun 2016 04:33 AM PDT

Currently cramming revision for physics, and just kinda interested.

submitted by /u/HackNAxe
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Is it possible for Gas Giants planets to be normal planets but with very high density atmosphere ?

Posted: 17 Jun 2016 02:52 AM PDT

And can there be life under this atmosphere but are undetectable to us ?

submitted by /u/BouBouG
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When you drop a rock into a pool of water, is there a way to predict the pitch of the sound that is made?

Posted: 16 Jun 2016 05:52 PM PDT

How unique is our solar system?

Posted: 16 Jun 2016 09:33 PM PDT

How does our solar system compare to others that we have discovered? I understand there to be a mix of planets, stars etc. but what about size or orbits?

I would actually like to know for a story I am writing. From Google I have found that it takes 5.3 hours for light from the sun to reach Pluto as the most distant planet (or whatever you wish to call it). How might other planetary systems compare? How might they be similar or different?

submitted by /u/frostee8
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Why does this two-photon system have mass?

Posted: 16 Jun 2016 07:08 PM PDT

Consider a system of two equal energy photons traveling antiparallel from one another.

The net momentum of this system is zero. Therefore, given

E2 - P2 = m2 (taking c to be equal to 1)

with P = 0, we have

E2 = m2

yielding

E = m

for this two photon system.

Does this have any physical significance?

submitted by /u/odkken
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Does it take more energy to heat something up or cool something down, or does it take the same amount?

Posted: 16 Jun 2016 04:33 PM PDT

What is the closest two planets can come near each other without actually crashing into each other?

Posted: 16 Jun 2016 07:27 PM PDT

I got the idea for the question from Futurama where the planet Mars flies by earth close enough for people on Mars to jump to Earth. Obviously that's absurd but it did make me wonder.

submitted by /u/Geminidragonx2d
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If irrational numbers cannot be expressed as fractions, then why can we measure pi as circumference/diameter?

Posted: 16 Jun 2016 07:51 PM PDT

Mars seems like a stupid "Last Resort"... Do we have better options?

Posted: 17 Jun 2016 06:50 AM PDT

So this Mars colonisation thing that has been in the works in the last few years seems to me like it's doomed to fail. I mean compare the amount of water on Mars to the amount of water on Earth. It doesn't seem like it's got much potential.

My question isn't really bashing on the project, but instead: Do we in fact have any other reliable options for colonisation? Obviously nothing else in our solar system, but in the next couple of centuries are we predicted to have the technology for further space travel? Do we know of other planets that mighthave similar water content, atmosphere, size, climats, etc? The whole thing is so deep and complex but it facinates the fuck out of me.

Thank in advance if you answer :)

submitted by /u/Yonsuo
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How is the Bekenstein bound reconciled with the apparent real number nature of the universe?

Posted: 16 Jun 2016 08:42 PM PDT

My understanding was that experiments such as the Lorentz invariance results achieved by Fermilab in 2009 put the minimum "pixel size" for the universe (if the universe is discrete at all) to well below the Planck length. Doesn't this imply that the information needed to store even the position/velocity of a single photon would be higher than the Bekenstein bound for a volume enclosing it?

Is there a contradiction here? If not, why not?

submitted by /u/Grejis
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Is the Earth spinning at a constant velocity?

Posted: 16 Jun 2016 07:10 PM PDT

If it is, how can it maintain a constant velocity?

If not, does it oscillate around a certain velocity?

Is it accelerating or decelerating?

And from where does the spinning arise in the first place?

submitted by /u/Shmeckels
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Is a black hole the highest state of entropy that can occur? (that we know of)

Posted: 16 Jun 2016 11:07 AM PDT

I was reading The Life of the Cosmos by Lee Smolin, and this is how he explained Bekenstein's dicovery.

According to the laws of thermodynamics, no process is allowed that can decrease the entropy of a system. Suppose that inside some boundary, a system exists that contains more entropy than any black hole, which fit inside the boundary, could contain. It turns out that in this case one can always add energy to the system until it is so dense that it must collapse to a black hole. But then the entropy goes down to that of a black hole that could be contained within the boundary. This is impossible, so there must be something wrong with the assumption of the argument, which was that a system can have more entropy than the largest black hole that fits into the same region.

What is the biggest region that one can assert?

Would the entropy of a region/system that contains the emissions of a "decayed" black hole have a higher entropy than it did while the black hole still existed?

I am not smart enough for this shit.

submitted by /u/Melquiedes
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Circular haze around moon during night?

Posted: 17 Jun 2016 05:19 AM PDT

(8:30PM in the southern hemisphere. Sydney, Australia) Ok so I was coming back from the park during the night and I looked up and saw a perfect circular haze/glowing and the moon right in the middle. You can distinctly see this circle. What is happening?

submitted by /u/hailhen223454
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What causes the cyclical temperature variation over the holocene?

Posted: 16 Jun 2016 09:41 PM PDT

In temperature reconstructions from ice cores, you get something a bit like this.

CO2 goes from about 200 to about 280, which is about 0.48 doublings. If the ECS is about 3°C per doubling, then due to the change in CO2, we should be seeing about 1.5°C of temperature increase.

What is causing the other 9°C of warming?

submitted by /u/ActuallyNot
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If Earth made it's rotation in half the amount of time would the effect of gravity be felt less?

Posted: 17 Jun 2016 04:25 AM PDT

Is it possible to block out the sun from Earth using a dinner plate?

Posted: 17 Jun 2016 01:13 AM PDT

The precise question is - is there a particular point in space where you could put a dinner plate, or something of dimilar size, that would completely stop any light hitting the earth? I understand things move a lot and at high speeds so I understand the plate would have to also move if it were to attempt to continue to completely block the sun from Earth

submitted by /u/st3richards
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Why do so many electronic devices have transformers (or "power supply bricks") at the end of the cord where they plug into the wall/power strip, rather than in the middle of the cord?

Posted: 16 Jun 2016 08:35 PM PDT

So many devices, from my computer to my phone charger to my wifi router, have massive bricks at the part where they plug into the wall, and wind up covering other outlets. I'm probably not the only person who's been frustrated by this.

I know it's possible to not do this, since other devices, like my Xbox or Macbook, have transformers in the middle of the cord, with another bit of cord that plugs into one socket and doesn't block anything else.

Why don't all devices do this?

submitted by /u/littletoyboat
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How is outside temperature determined? My Mom's outside thermometer is in the sun and always shows hotter than what the weather reports state.

Posted: 17 Jun 2016 12:01 AM PDT

The other day we were talking and I said it was only supposed to be around 76°F outside. She looked at her outdoor thermometer and said it's almost 91°F.

submitted by /u/ABookishSort
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Is a kugelblitz a direct result of energy mass equivalance?

Posted: 16 Jun 2016 08:11 PM PDT

Before Einsteins E=mc^2, how did people explain the sun/stars shining?

Posted: 16 Jun 2016 09:42 AM PDT

Isn't fusion basicly converting mass into energy?

submitted by /u/extrapommes
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Do anti-matter-blackholes exist?

Posted: 16 Jun 2016 03:47 PM PDT

and will happen if a hypothetical anti-matter-blackhole merges with a normal one?

submitted by /u/bnbgrs
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