How many molecules of a substance is required to define the physical state of that substance (solid, liquid, gas, plasma)? |
- How many molecules of a substance is required to define the physical state of that substance (solid, liquid, gas, plasma)?
- Can someone explain the spontaneity of time symmetry breaking in the Lukin and Monroe time crystal experiments?
- Why are Neutron Stars magnetic?
- Does the brain make a sound?
- How can freezing water break matter?
- How do asexual organisms get the genetic variation necessary for evolution?
- What is an ecological niche?
- If the entropic heat death of the universe happens, will the temperature of the universe be 0 °K?
- What happens to foreign particles in the human body?
- How do teeth know how long they must get?
- Is there a place to find annotated transcripts, or a source explaining the audio/transcripts of things like the apollo or gemini missions?
- Does it take more energy to heat objects at higher temperatures?
- How do DHT-Inhibitors like the ones seen in some hair loss treatments (Azelaic acid) affect the body's overall DHT and testosterone levels?
- Are there problems that are more efficient using recursion?
- Why do computers make a whine when powering up?
- Does NASA have a way to track Rovers and Astronauts on the surface of the moon or Mars accurately?
- Since birds are dinosaurs, are birds reptiles?
- What will the continents look like in a few million years? Does anyone have a picture of what scientists think the world would look like?
- How are the generic names of drugs determined? Is it based on the structure of the molecule, its effect, both, neither? Are there any hard rules?
- How radioative are undetinated nuclear weponsq2?
- How does a molecule "decide" to emit a photon?
- If terrestrial plants get the majority of their mass from the carbon dioxide in the air, where do aquatic plants get their mass from?
| Posted: 29 Oct 2019 05:47 PM PDT Edit: Thank you, everyone! This seemingly small thought experiment has sparked a wonderful conversation and spurred my interest even more. [link] [comments]  |
| Posted: 29 Oct 2019 03:35 PM PDT As I understand it: In both experiments, there was a drive (lasers in Monroe's, microwave pulses in Lukin's) that causes a change in spin state of a system (Monroe: a chain of ytterbium ions; Lukin: defects in a diamond). In both cases, the spin states of these systems revert back to their original state. However, the drives were periodically applied, and the resulting spin state oscillation did not match the periodicity of the drive, but oscillated at 1/2 or 1/3 the frequency. (I may have misunderstood this - I'm a biologist, not a physicist. Please correct me if so). What I don't understand is - if the periodicity of these systems is a result of the periodicity of the drive, and not a product of the systems themselves under specific conditions, why is this spontaneous breaking of time symmetry? [link] [comments]  |
| Why are Neutron Stars magnetic? Posted: 30 Oct 2019 03:19 AM PDT As the title states, why do Neutron stars not only have a magnetic field, but are some of the most magnetic objects in the universe? Given that they are comprised of mostly neutrons, which I understand to be electrically neutral, I can't see how they generate their magnetic fields. Even if say they're a slew of protons and electron in a given neutron star, combined with its rapid spin, I can feasibly see it generating a magnetic field, but the most powerful? [link] [comments]  |
| Posted: 29 Oct 2019 05:37 PM PDT Obviously the friction in the blood vessels with the blood would make some noise, but do the neurons make any sound when firing? [link] [comments]  |
| How can freezing water break matter? Posted: 29 Oct 2019 01:38 PM PDT I'm not sure how to put it exactly so here is a simple, "ideal" scenario: If I put a bottle of water in a room and start removing heat from the room, the water will first lose its sensible heat until it gets to 0 C. Then, the water will give up its latent heat and start freezing. Since ice is less dense than liquid water, it will start to expend in volume as well. But if my bottle is closed, the ice will build pressure inside it until it breaks. The ice will do "work" on the bottle. My question is: how could the formation of ice break the bottle if the water is already giving up energy as heat? Is there a force known as "work energy of crystal formation" that would explain it? How could it be explained on an atomic level? Thank you for considering this. I couldn't find a satisfying answer by myself. [link] [comments]  |
| How do asexual organisms get the genetic variation necessary for evolution? Posted: 29 Oct 2019 07:46 PM PDT If asexual reproduction produces a clone or exact copy of the original cell or the parent organism, when or how do mutations happen? For example, can mutation happen in cellular fission? and if so, is it then incorrect to say that the result of fission are two or more cells identical to the original one? Thanks. [link] [comments]  |
| Posted: 29 Oct 2019 02:10 PM PDT |
| If the entropic heat death of the universe happens, will the temperature of the universe be 0 °K? Posted: 29 Oct 2019 04:44 PM PDT Colleague and I couldn't figure this out during our lunch walk. Help us out Reddit! [link] [comments]  |
| What happens to foreign particles in the human body? Posted: 29 Oct 2019 07:41 PM PDT What I mean here is what happens to dirt, pollen, microbes and other fine particles that presumably get stuck in our mucus or lungs when we breathe in? I would think it can't just stay because death would come fast. [link] [comments]  |
| How do teeth know how long they must get? Posted: 29 Oct 2019 12:23 PM PDT They're made from the same material as hair and nails, but they keep on growing, so why not teeth? Reason I ask is because I just got braces and when I saw the simulation, I noticed that even my askew teeth will be the correct length after moving. How can this be? [link] [comments]  |
| Posted: 29 Oct 2019 05:29 PM PDT I've been listening to the gemini audios because im super interested in this stuff and plan on majoring in aerospace engineering, but I am not at all a pilot, and being 17 years old I have nothing but self studied knowledge on the topic. I'd really like to listen to the audios and know what the heck is going on lol. Thank you for any response in advance. (also I don't browse this sub very often I was hoping it was the right place, I also hope this was the right flair) edit- typo [link] [comments]  |
| Does it take more energy to heat objects at higher temperatures? Posted: 29 Oct 2019 03:01 PM PDT For example I have a pan at 35 degrees and a pot at 70 degrees. Would it take more energy to increase the temperature of the pan from 35 to 40, than it would the pot from 70 to 75? Basically I'm measuring changes in temperature and trying to figure out if starting at the same ambient temperature would matter or not if the ambient temperatures are fairly similar. [link] [comments]  |
| Posted: 29 Oct 2019 10:27 PM PDT Is the inhibition of DHT only topical? Will it only reduce DHT in the scalp skin area? Could this have any affect on lowering athletic performance from a reduced levels of DHT? I realize this is a very specific question, but I was not able to easily find it after searching through google. Hope somebody has an answer preferably with a solid source. Thanks! [link] [comments]  |
| Are there problems that are more efficient using recursion? Posted: 29 Oct 2019 03:27 PM PDT Thanks to computerphile I know that there are certain problems like the Ackermann function which have to be computed using recursion. However for other problems it seems like using recursion has greater complexity e.g calculating the Fibonacci sequence recursively repeats a lot of work whereas just iterating through values of n is less complex. Are there any problems which can be solved without using recursion but recursion reduces the complexity? [link] [comments]  |
| Why do computers make a whine when powering up? Posted: 29 Oct 2019 09:24 PM PDT |
| Does NASA have a way to track Rovers and Astronauts on the surface of the moon or Mars accurately? Posted: 29 Oct 2019 02:53 PM PDT Since GPS isn't a thing on the moon what alternative methods of tracking do we use? [link] [comments]  |
| Since birds are dinosaurs, are birds reptiles? Posted: 29 Oct 2019 09:23 AM PDT |
| Posted: 29 Oct 2019 09:38 AM PDT |
| Posted: 29 Oct 2019 11:39 AM PDT |
| How radioative are undetinated nuclear weponsq2? Posted: 29 Oct 2019 12:19 PM PDT Little boy contained 64 kg (141 lb) of enriched uranium. Supposedly(specifics are hard to find) more modern weapons use 2 to 4 kg(4.5 to 9 lbs.) of Plutonium How much radiation would that actually give off in an undetonated state? Do they put shielding in the bomb? Edit: Apologies for the horrendous title my phone spazzed out :( [link] [comments]  |
| How does a molecule "decide" to emit a photon? Posted: 29 Oct 2019 09:30 PM PDT I was reading this article about CO2 absorbing infrared radiation and it had this line in it:
I haven't really been able to find any good info on why it's "some time later" though. What causes the CO2 to eventually re-emit a photon? [link] [comments]  |
| Posted: 29 Oct 2019 01:16 PM PDT |
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