- If you had a completely empty universe, in which only 2 marbles, placed perfectly still in the beginning, with 1 ly distance in between them, how long would it take for them to collide due to gravity?
- Can pi be expressed rationally in a non base 10 number system?
- Would you be able to measure your speed relative to the rest of the universe with the speed of light?
- Is there an isotope effect on fugacity?
- What's the probability that in n vectors, each with n elements where each element is a random integer, that the set is linearly independent?
- How did scientist measure the speed of light?
- What adaptations make the Black Mamba so fast (compared to other snakes)?
- Can someone answer questions about what a quantum gate (or band gap) looks like compared to a FET, and coding for photons?
- Are there any colours perceptible by the human eye that we haven't discovered?
- When listening to music with earbuds/headphones, how are the producers/artists able to make the music only play on one side?
- Is it possible to define electric charge in an absolute (non relative) sense?
- Why is it that when a bullet fully penetrates a target, the exit hole is so much bigger than the entry hole?
- How exactly do qubits work and how are they different to regular bits? Does quantum computing allow us to solve problems that were previously unsolvable with regular computing (excluding raw processing power)?
- Is there a name for this phenomenon?
- Why are the occipital lobes, which deal with vision, in the back of the brain while the temporal lobes, which include that auditory areas, are right next to the ears?
- Regarding Dark Energy, how do we know that the redshift of galaxies is due to the expansion of space, and not due to their relative velocity through space?
- If you mix oil and water in a bowl and wait for a while, you will see gravity seperate them and put all of the oil on top. How is this consistant with the law of increasing entropy?
- Are the genetic causes of infertility for men and women stem from the same genes, or different genes?
- How can position to term rule be applied in daily life?
- Can Natural Killer Cells Be Used to Kill Cancer Cells?
- When a supernova ejects its elements, do the heavier ones spread out as far as the light ones or do they always stay near the center. And if so is that the reason why in our solar system 'solid' planets are near the sun?
| Posted: 16 Oct 2016 08:03 AM PDT Assuming the marbles are something like 10 cm in diameter and around 100 g heavy. Do they ever collide? Or is the gravitational attraction way too small? But since gravitational fields are infinite they should collide at some point even if it took them something like 1*10³³ years or something. Edit: WOW. Frontpage. Never expected so much attention. Seems like people wonder as much as I do. :D [link] [comments]  |
| Can pi be expressed rationally in a non base 10 number system? Posted: 17 Oct 2016 04:42 AM PDT |
| Posted: 17 Oct 2016 12:54 AM PDT What I am saying is, would you be able to measure your speed and the direction you are travelling in relative to the while universe? E.g. If you had a laser and flashed it at a detecter and calculated the speed to be the speed of light plus 100km/h, would that mean relative to the rest of the universe, the set-up is travelling 100km/h in the direction opposite that of the laser beam? Sorry if this is ridiculous, just a thought I had. [link] [comments]  |
| Is there an isotope effect on fugacity? Posted: 16 Oct 2016 06:19 PM PDT Specifically, is the fugacity at a pressure P of H2 gas different than the fugacity at a pressure P of D2 (deuterium) gas? [link] [comments]  |
| Posted: 17 Oct 2016 12:06 AM PDT |
| How did scientist measure the speed of light? Posted: 17 Oct 2016 06:04 AM PDT |
| What adaptations make the Black Mamba so fast (compared to other snakes)? Posted: 16 Oct 2016 11:39 AM PDT |
| Posted: 16 Oct 2016 08:02 AM PDT I have some questions and would appreciate any information you have on these subjects. My background is not science, but I can't stop thinking about these 3 things and if I don't write a story and get them out of my head - they just stay there and don't let me focus well on other things. I want my story to make sense, but I need some help. If you have an explanation...please keep this in mind. ...and thank you, thank you, thank you if you are will to answer. A few years back I read an article on Graphene and conductivity. It basically stated that it was so conductive that they were having a difficult time finding an interruption switch (they couldn't turn it off). We finally have an interruption switch for Graphene: https://www.scientificamerican.com/article/graphene-finally-gets-an-electronic-on-off-switch/ This effectively makes graphene a transistor. "Semiconductors are defined by their band gap: the energy required to excite an electron stuck in the valence band, where it cannot conduct electricity, to the conduction band, where it can. The band gap needs to be large enough so that there is a clear contrast between a transistor's on and off states, and so that it can process information without generating errors." I also read an article on how MIT was able to create something of a quantum gate, similar to a field effect transistor, but for quantum computing. However, in order for quantum computing to come to fruition we have to have the ability to pass a single photon (and only a single photon) through a gate. http://news.mit.edu/2012/single-photon-transmitter-could-enable-new-quantum-devices-0725 Is is passing through the gate or the drain? (like FET) What is the definition of a band gap in quantum computing? When it comes to writing code for quantum computing, I can't help but think of a shutter on a camera. Will we write code that basically opens the shutter to a certain degree (instead of 0's and 1's) ? Or can we again apply the same principle of the interruption switch and control the amount of light? [link] [comments]  |
| Are there any colours perceptible by the human eye that we haven't discovered? Posted: 16 Oct 2016 06:29 PM PDT |
| Posted: 17 Oct 2016 04:05 AM PDT On my ride into work, I noticed that in my song there was one point where the artists voice only came through one earbud, then switched to the other side. How is it possible for the producers to create this effect? [link] [comments]  |
| Is it possible to define electric charge in an absolute (non relative) sense? Posted: 16 Oct 2016 05:30 PM PDT A positive charge is the opposite of a negative charge. But is it possible to define one without referring to the other, or they solely relative terms? A book I am reading claims it is not possible, and as a consequence the two charges could in theory swap throughout the entire universe, and nothing would be observed as different. It sounds very odd and i was wondering if the basis is true. [link] [comments]  |
| Posted: 16 Oct 2016 11:15 AM PDT EDIT: this isn't about fragmentation. If a high powered round goes through multiple targets, it will leave a clean entry and a huge exit in all of them. This is the vid that inspired the question: https://youtu.be/NfOhKDJZsCk [link] [comments]  |
| Posted: 16 Oct 2016 08:31 PM PDT |
| Is there a name for this phenomenon? Posted: 16 Oct 2016 03:17 PM PDT OK, so here's the context: Person A and Person B are doing a q&a format interview. Person B is expecting a question that is very broad but has a direct response that can be rooted in logic. Person A instead asks a question that is very specific with a broad list of responses. Person B suddenly goes blank, instead of having an answer, the question itself becomes the main focus of Person B's cognitive processing. Usually Person B will then either ask Person A to reiterate the question, or respond with an "I have no idea what you're even asking" response. What is this called, and why does it happen? [link] [comments]  |
| Posted: 16 Oct 2016 10:58 AM PDT |
| Posted: 16 Oct 2016 11:47 PM PDT Being interested in Astronomy and Cosmology, I spend a lot of time watching lectures and documentaries on the subject. But it seems no matter how many of them I watch, they never seem to answer this question, and it's been nagging at me for a while. When it comes to the subject of Dark Energy, these documentaries always give a short of history of how it came to be discovered. It starts with Einstein's theories and his introduction of the Cosmological Constant to make the universe static, and then Hubble measuring the redshift and proving the expansion, causing Einstein to call the CC his "biggest blunder". Then fast-forward to the nineties and Saul Perlmutter and his team using type 1a supernovae to accurately measure redshift of many galaxies, basically greatly expanding on (no pun intended) the Hubble data and coming up with a graph such as this: http://newscenter.lbl.gov/wp-content/uploads/sites/2/2009/10/expansion-history.jpg Then they finish up by saying that this data proves that the expansion of the universe is accelerating...perhaps with some examples involving raisin bread and ants on ballons. It is this last part that brings me to my question and have never been able to find any clarification on. It seems like there could be two possible reasons for the redshift, each leading to opposite conclusions. 1) The redshift is caused by the expansion of space since the photons left the source galaxy, causing their wavelengths to get stretched out. Because the redshift of nearby (but not gravitationally bound) ones is greater than what we would expect given a constant or decelerating expansion, the conclusion is that the expansion is accelerating. Okay, makes sense. 2) The redshift was caused by the relative velocity between the source galaxy and our own when the light left. If this were the case, it would seem to imply that the universe (but not necessarily space itself) was expanding more rapidly in the distant past, and less rapidly in the more recent past. This would also seem to make sense, but is never discussed. (Also, it seems like the redshift being greater than expected for the more nearby galaxies, would also imply that the deceleration of the expansion is decreasing. This would require an explanation just as much Dark Energy would...maybe due to increasing density of the interstellar medium at shorter distances causing friction or some such thing...but maybe my logic is just failing me at this point) Alternatively it seems like it could also be some mixture of the two. So this brings me back to my original question. How is it that the second case was ruled out, whereas the first one was not, especially given that at the time it was the second conclusion that was expected? Let me just say that I'm not trying to argue about this as I'm certain there is a perfectly good explanation for why it is 1 and not 2. I'm simply trying to figure out what that reason is, as I've never been able to find anything that goes into the details and explains it. I'm assuming there must be some sort of complicated math involved and it just can't be easily explained in layman's terms and therefore not appropriate for these lectures/documentaries/etc. as they are intended for the general public, so if you have to get a little technical for this answer I completely understand and will try to follow along anyway, but keep in mind I am a complete layman myself. Thanks! [link] [comments]  |
| Posted: 16 Oct 2016 07:02 AM PDT |
| Posted: 16 Oct 2016 09:15 AM PDT Or is the answer some genes affect both sexes and some don't? [link] [comments]  |
| How can position to term rule be applied in daily life? Posted: 16 Oct 2016 03:15 PM PDT Asking for my stepson. The teacher has failed to answer his question so I am reaching out. What can it be used for? What are its applications in everyday life? What is the point of learning it in addition to term to term rule? [link] [comments]  |
| Can Natural Killer Cells Be Used to Kill Cancer Cells? Posted: 16 Oct 2016 07:40 AM PDT Obviously lots of problems to overcome. How do we tag cancer cells and only cancer cells with the MIC that allows natural killer cells to identify cancer cells only is a big one. Is using the body's immune system to kill cancer cells something that's already being explored in cancer research? Are there any other theories on how Cancer cells could be targeted that we can't pull of with our current equipment but we know would most likely work? [link] [comments]  |
| Posted: 16 Oct 2016 02:15 AM PDT And if we wanted to "mine" heavy elements, would mercury the best candidate? [link] [comments]  |
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