Why does this rainbow appear to be being 'revealed' by the mist? |
- Why does this rainbow appear to be being 'revealed' by the mist?
- How does Globally Unique Identifier aka GUID works?
- People always talk about heat conduction, what is the best conductive material for cold, or is the best conductor for heat the same for cold?
- Is there any reason that actual GPS transmitters would not work if placed on terrestrial towers?
- Why does 0!=1?
- Why isn't the entire length of the Colorado River a deep canyon?
- I've heard the electron described as a point particle - since it has mass, wouldn't that make it a black hole?
- Does a swapping of bases between the strands count as a single nucleotide polymorphism?
- What is the difference between a computer verifying the answer to a problem and solving the problem?
- What if you fell into a collapsing black hole?
- How can a black hole's singularity be a "point", wouldn't that violate the pauli exclusion principle?
- Why can we see such vivid images when we dream but not see our normal, everyday thoughts in the same way?
- Are there any consequences or side effects to firing protons at each other in a super collider?
- What is the most efficient phrase or sentence that can document the most features of a dying language?
- How do we find (-1)^pi? More generally, how do we find an irrational power of a negative number?
- Why do ethanol and isopropanol smell so different?
- Does a black hole form from the inside out, outside-in, or all at once, when a star collapses?
- Why can't my brain correct my blurry vision?
- In Twin Paradox of General Relativity, what would happen if one twin does not come back ?
- Why does e^(π*√-1)?
- What is the most efficient type of solar cell (including designs currently undergoing research if applicable)? What is it made of? and briefly explain what processes it uses to create energy. What are its mass production limitations?
- Does gravity work on the time 'dimension' or just the spatial 'dimensions'?
- Two LED bulbs are on. One is 2700k color and the other is 5000k. What do eyes see? A blended color of ~3800k?
| Why does this rainbow appear to be being 'revealed' by the mist? Posted: 05 Nov 2015 03:36 AM PST I was on /r/gifs earlier and saw this gif. The mist forms a rainbow, but as the mist moves, the rainbow follows the same arc as it initially did, as if there was one continuous rainbow that was being 'revealed' by the mist as it drifted across. So why does this happen? Shouldn't the rainbow just appear to be shifted across as the mist moves? [link] [23 comments]  |
| How does Globally Unique Identifier aka GUID works? Posted: 04 Nov 2015 11:23 PM PST So I'm confuse about how GUID works, it's said that the probability of colission is very very low. But let's say GUID is either A, B, C, D, E..Z. and I have 2 computers in my home with same algorithm, the 1st computer produce A, how did computer B know that A is already produced? [link] [30 comments]  |
| Posted: 04 Nov 2015 06:45 AM PST |
| Is there any reason that actual GPS transmitters would not work if placed on terrestrial towers? Posted: 05 Nov 2015 04:48 AM PST |
| Posted: 04 Nov 2015 07:51 AM PST In my stats class today we began to learn about permutations and using facto rials to calculate them, this led to us discovering that 0!=1 which I was very confused by and our teacher couldn't give a satisfactory answer besides that it just is. Can anyone explain? [link] [206 comments]  |
| Why isn't the entire length of the Colorado River a deep canyon? Posted: 04 Nov 2015 01:28 PM PST What was special about the area where the Grand Canyon was formed compared to the rest of the length of the Colorado River? [link] [9 comments]  |
| Posted: 04 Nov 2015 05:47 AM PST Or is that proof the electron has a radius, since it would evaporate if it were a black hole? [link] [34 comments]  |
| Does a swapping of bases between the strands count as a single nucleotide polymorphism? Posted: 05 Nov 2015 05:27 AM PST I was wondering whether someone could explain to me if a change in bases could be considered a SNP even if the bases had just swapped. For example if I had DNA running: A C A T G T G T A C or A C T T G T G A A C Would the change of the A and T be considered a SNP. Just trying to get my head round my molecular genetics module, thanks! [link] [2 comments]  |
| What is the difference between a computer verifying the answer to a problem and solving the problem? Posted: 04 Nov 2015 09:46 PM PST Apparently the fundamental basis of the P vs NP problem is, according to wikipedia: "whether every problem whose solution can be quickly verified by a computer can also be quickly solved by a computer." What is the difference between those things? [link] [6 comments]  |
| What if you fell into a collapsing black hole? Posted: 04 Nov 2015 10:00 PM PST I know falling into black holes comes up quite a bit here, but I though of a different angle on it that I didn't see addressed after a quick search. So, an astronaut falling into a static black hole might not notice when she passed the event horizon (let's assume it isn't full of radiation for now), and would continue falling until tidal forces ripped her apart. But a distant observer would see the astronaut get "frozen" at the event horizon, before getting red shifted out of existence. I'm ok with their different perspectives of what happens here. But... let's assume this black hole eventually evaporates by Hawking radiation, like we expect all black holes will. I've read that the outside observer now sees the astronaut fall into the black hole at the moment it evaporates, or alternately that they see the astronaut is burned up. But from the perspective of the astronaut inside the black hole, when does the black hole evaporate? I mean, I assume she will be killed pretty quickly, but say from the perspective of her electrons. Does she never encounter the evaporation, because time is curved so far inside the black hole that the event horizon can't be in her future? Or would the event horizon "catch up with her" as it shrank down? Is the answer going to require distance scales so small that we need a quantum theory of gravity to say anything about it? Bonus points if you can tie this into the information paradox. [link] [6 comments]  |
| Posted: 05 Nov 2015 07:16 AM PST (my bad layman understanding) As I understand it, a singularity is a "point", and a "point" is "sizeless", meaning that all that compressed mass will occupy the same space, which violates the pauli exclusion principle... what is wrong with my understanding? [link] [4 comments]  |
| Posted: 04 Nov 2015 07:10 AM PST |
| Are there any consequences or side effects to firing protons at each other in a super collider? Posted: 04 Nov 2015 11:25 PM PST I haven't heard of any repercussions from using the Large Hadron Collider, but with the more powerful one being built in china and more to inevitably come, at what point (if any) should we be concerned with the power of a super collider? [link] [7 comments]  |
| Posted: 04 Nov 2015 04:02 PM PST My family has a local language spoken by maybe ten people still living. I would like to record as few phrases as possible to document as much of the language as possible. What is the best way to go about this? [link] [11 comments]  |
| How do we find (-1)^pi? More generally, how do we find an irrational power of a negative number? Posted: 04 Nov 2015 03:49 PM PST |
| Why do ethanol and isopropanol smell so different? Posted: 04 Nov 2015 05:27 PM PST Do they activate different receptors? What is happening at the molecular level, the alcohol interacting with a receptor, up to how the brain turns that into a smell? [link] [4 comments]  |
| Does a black hole form from the inside out, outside-in, or all at once, when a star collapses? Posted: 04 Nov 2015 01:34 PM PST From the outside-in doesn't make sense, because the singularity should be a point, not a shell. If the black hole forms from the inside out (ie the core of the star first), then we should never see it grow because the rest of the collapsing matter will take forever to fall into the singularity due to time dilation, correct? Or, does the event horizon suddenly appear at the instant of collapse, making everything inside instantly invisible to the outside? [link] [12 comments]  |
| Why can't my brain correct my blurry vision? Posted: 04 Nov 2015 12:33 PM PST I know that brains can correct for all kinds of weird visual problems, like filtering out blood cells and vessels and people with one eye being able to perceive depth, and I've even read about people being asked to wear goggles that turned the world upside-down developing the ability to interact with the world as normal. So why is it that my brain can't deal with the blurriness caused by my nearsightedness and mild astigmatism? [link] [12 comments]  |
| In Twin Paradox of General Relativity, what would happen if one twin does not come back ? Posted: 05 Nov 2015 02:39 AM PST So would it be that twin A experiences a short time while twin B experiences a whole age of universe, and likewise, twin B experiences a short time while twin A experiences a whole age of universe ? Did i make a mistake or is something strange going on ? Thanks in advance [link] [7 comments]  |
| Posted: 05 Nov 2015 02:08 AM PST How do you even raise a number to a imaginary number? Is there any other occurrences with imaginary numbers being used this way? [link] [5 comments]  |
| Posted: 04 Nov 2015 06:47 AM PST I found here and here, that SolarCity and Panasonic compete to hold the most efficient rooftop solar cells / panels, but in both articles it states that Panasonic's cells are much more expensive to create, but why? What element/material is making it so expensive? Are there smaller startups that contend to beat this with their own designs that are not even in production yet? What is barring that from ever making it to market? [link] [14 comments]  |
| Does gravity work on the time 'dimension' or just the spatial 'dimensions'? Posted: 04 Nov 2015 10:39 AM PST I don't exactly know what I'm asking here. But if there were a small thing of some kind that were slightly 'before' some other big thing, would that big thing bring the thing 'forward'? [link] [6 comments]  |
| Posted: 04 Nov 2015 08:27 PM PST Was wondering if mixing LEDs would get the color range more to my liking, 3500k range. [link] [2 comments]  |
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