network profile
| bio | website | dropletsforming.blogspot.com |
|---|---|---|
| location | England, United Kingdom | |
| age | 30 | |
| visits | member for | 2 years, 5 months |
| seen | May 13 at 12:22 | |
| stats | profile views | 31 |
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Mar 12 |
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How do we perceive colors outside our gamut? I see what you're saying now, I didn't get any of that from the answer. Also interesting might be perception of blue without perceiving red, as red cones have a blue peak as well; this could be what we call violet. |
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Mar 12 |
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What is the limit to how many satellites can orbit the earth? The GEO satellites are running around the equator, and so are some of the other satellites. Most non-GEO satellites, however, have a different inclination, because the geostationary bit is the main reason to put a satellite above the equator. At low orbital altitudes, the satellite is visible for a smaller area of the Earth's surface, so to reach the majority of users in the northern hemisphere (North America, Europe) they have to have a higher inclination to be any use. These satellites are then less useful for much of their orbit. |
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Mar 12 |
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How do we perceive colors outside our gamut? @MSalters: Ok, I can believe that there is more to it than independent cone saturation, but regardless of why they are firing or not firing, the signals come from your existing cones, so the brain interprets them as colours just as if there was a light of that colour. My point is that after-images just produce other colours from the same gamut. |
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Mar 11 |
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Why the quantum entanglement doesn't break quantum cryptography @PeterShor: Looks like an answer to me. |
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Mar 11 |
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How many quarks in a proton? This answer seems reasonable, but perhaps clarify that the infinite quarks are merely probabilistic and temporary. The three stable quarks are the only ones with any importance outside the hadron. |
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Mar 11 |
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Differential Forms and Densities Integrating over a volume of a charge density will give you a charge. To get mass you would need the density itself (rather than the charge density). So unless you know some relation between charge and mass, e.g. that only electrons inhabit the space and thus go charge density->electron density->mass density, you don't have the right information. Is it a different kind of density you are expecting? |
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Mar 11 |
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How do we perceive colors outside our gamut? I believe afterimages are simply a result of saturation of the cones, and the resulting lag in their response to intensity changes. The colours you see in an afterimage are still just some combination of red, green and blue, so although it looks strange, it is probably reproducible. |
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Mar 11 |
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How to get the angle needed for a projectile to pass through a given point for trajectory plotting @NineBlindEyes: Try the equation I give. Unless I've made a mistake, it should give the two possible answers. |
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Mar 11 |
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How to get the angle needed for a projectile to pass through a given point for trajectory plotting I don't think this answers the question. The question requires the path to pass through a specific point x1,y1. This equation will only yield an answer for a path to another x-value at the same height, e.g. x0,y0 to x1,y0. |
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Mar 8 |
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Is mass quantized? Relativity shows us that there is a rest state of a particle; it has innate properties when no force is acting on it. In the frame of a particle moving at a constant speed, it is at rest, and thus no property of it can depend on its speed. To an observer in a different frame, however, it can have momentum and other kinetic properties. |
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Mar 8 |
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Is mass quantized? The momentum of a particle does not affect its rest mass by definition. Momentum itself is usually quantised in bound states, like electrons in an atom. |
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Mar 8 |
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Are there more bosons or fermions in the universe? Do you mean fundamental bosons and fermions, or can they be composite? For example, mesons are composite but photons are elementary. |
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Sep 26 |
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Superluminal neutrinos @leftaroundabout: we can only measure the speed of light in a vacuum through a vacuum. So given a constant density of vacuum particles, the speed of light through the vacuum would always be constant. Only with a different particle (e.g. a neutrino) would we be able to measure a higher speed. Inevitably, if this turned out to be the case, the real upper limit is slightly higher again, since neutrinos are massive and thus move below the maximum speed. |
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Jun 6 |
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How would Kohn-Sham orbitals differ from 'true' elecron wavefunctions? Well, perhaps - DFT gives you a single slater determinant and a set of component orbitals. Consider the lowest orbital from DFT - how would that compare to the delta between an occupied total wavefunction and where 1 electron has been extracted with maximum energy? |
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Nov 30 |
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Teleportation by quantum isolation Interestingly, if the two boxes were close together, a particle-antiparticle pair could be spontaneously created between the two, and the antiparticle annihilate with the original particle. The result would be that the particle has disappeared from one box and appeared in the other - in other words, the teleportation mentioned in the question title. |
