Is there any culture (current or past) that doesn't honor their dead? |
- Is there any culture (current or past) that doesn't honor their dead?
- How does our bodies deal with pollutants in air? And how does micro dust particles effect our bodies?
- Why aren't solar panels mounted on wind turbine towers?
- How does the Doppler shift of light waves affect the photoelectric effect in metals?
- Why does gallium make aluminum brittle and does this phenomenon occur in other materials?
- Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology
- Is there a theoretical maximum for how fast a propeller can turn in water, yet still be effective?
- Does the photon sphere around a black hole actually contain a significant number of photons? Or do they all decay into unstable orbits?
- Why does Pythagorean's theorem work?
- How deep could a human go under water and still use a snorkle?
- Does the higgsfield interfere with the conservation of momentum on massive objects?
- Is there a mechanism for gross movement of electrons or atoms to raise the energy levels of bound electrons?
- Why were there no alternative interpretations of Rutherford Gold Foil Experiment?
- If fusion requires energy and releases even more energy, would the fusion products require energy to separate or would they naturally decay? [physics]
- Electron is accelerated in electric field: How are excess energy and momentum accounted for?
- An object falling at terminal velocity is accelerated. The force stops. Does the object slow and return to its terminal velocity and of so, what force is causing this deceleration?
- Why is alcohol so associated with male violence when it is supposed to lower testosterone?
- If a free proton and electron combined to produce a Hydrogen atom, is it formed in its excited state?
- What would a collision between a star and a planet look like?
- What would be the "reaction" to gravity's "action"?
- Are there infinetly many prime numbers?
- [Mathematics] Does any succesive application of roots have a limit?
- Are there any fluids that can exist in a vacuum?
| Is there any culture (current or past) that doesn't honor their dead? Posted: 28 Feb 2017 09:18 PM PST |
| Posted: 28 Feb 2017 09:50 PM PST |
| Why aren't solar panels mounted on wind turbine towers? Posted: 28 Feb 2017 09:14 PM PST My thoughts so far: A 3 MW wind turbine tower (ca. 5.000 kWh / year) is 100 m tall and about 5 m wide. It should be possible to mount about 500 m2 facing east to west with a 45° mounting angle to produce roughly 50 kWh / year in northern Germany (where I am) up to 100 kWh / year in Texas (I used an online calculator and tried to maximize output by changing locations). So only 1% - 2% solar in comparison to wind. Pros
cons
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| How does the Doppler shift of light waves affect the photoelectric effect in metals? Posted: 01 Mar 2017 06:11 AM PST I had this thought today: suppose we positioned a light source and metal surface in space facing each other - the light has a frequency below that of the threshold frequency of the metal. If we were to cause relative motion between the two (for e.g. Moving the source towards the metal at a high speed) so that the light was blue shifted such that its frequency exceeded the threshold frequency, would the photoelectric effect now be observed? [link] [comments]  |
| Why does gallium make aluminum brittle and does this phenomenon occur in other materials? Posted: 28 Feb 2017 08:07 PM PST When the liquid metal, gallium is poured on aluminum, it somehow binds with the aluminum and makes it incredibly brittle. I'm talking like saltine crackers brittle. Why does this happen and is aluminum vs gallium the only instance of this phenomenon? [link] [comments]  |
| Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology Posted: 01 Mar 2017 07:05 AM PST Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Economics, Political Science, Linguistics, Anthropology Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...". Asking Questions: Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists. Answering Questions: Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience. If you would like to become a member of the AskScience panel, please refer to the information provided here. Past AskAnythingWednesday posts can be found here. Ask away! [link] [comments]  |
| Is there a theoretical maximum for how fast a propeller can turn in water, yet still be effective? Posted: 28 Feb 2017 06:33 PM PST If a propeller were rotating under water, at some point would the RPM be so great that it moves more quickly than the water can fill the "gap" behind it? Or perhaps, is there some kind of theoretical upper limit as to how much force can be generated from the RPM of the propeller? Or, is there some speed at which the kinetic energy produced by the propeller boils the water, possibly causing any loss of effectiveness? (if that's even possible). I would be really interested in learning about the fluid dynamics that are going on here. [link] [comments]  |
| Posted: 28 Feb 2017 06:23 PM PST I'm not sure if I'm misunderstanding the concept here but photons can exist in a 'straight' spacetime path at 1.5 times the Schwarzschild radius? But if on one side of the black hole there is slightly more particles than on the other then wouldn't they warp the Schwarzschild radius at that specific point enough so that the photons in the photon sphere would require a slightly different energy to stay in orbit? Does the photon sphere actually exist? Maybe I'm misunderstanding the math but wouldn't it be extremely easy to disrupt the orbit? [link] [comments]  |
| Why does Pythagorean's theorem work? Posted: 28 Feb 2017 03:37 PM PST Is there a way to intuitively understand why a2 + b2 = c2? I've known this formula most of my life and never understood how it works out. [link] [comments]  |
| How deep could a human go under water and still use a snorkle? Posted: 28 Feb 2017 07:45 PM PST At what point does the air pressure exceed the exhale pressure of a typical human? Meaning spent air could not be expelled to make room for fresh air. Would the pressure keep you from inflating you lungs before you reach this depth? Or would your body be crushed? Assume the snorkle doesn't buckle or crumple under pressure. [link] [comments]  |
| Does the higgsfield interfere with the conservation of momentum on massive objects? Posted: 01 Mar 2017 05:59 AM PST Wouldnt the higgsfield slow down fast moving objects like the "Starshot" spacecraft if it moves at 0.2c? As the higgs interaction gets stronger the more i boost particles? [link] [comments]  |
| Posted: 01 Mar 2017 01:40 AM PST I understand that through the photoelectric effect an photon with a higher than ionization energy can be converted into a freed electron with the amount of higher than ionization energy showing up as electron velocity, but does that work the other way? If 2 atoms, both with electrons in their ground states "bump" into each other, can some of that kinetic energy be converted into the either atom's electrons being in a higher energy state? [link] [comments]  |
| Why were there no alternative interpretations of Rutherford Gold Foil Experiment? Posted: 28 Feb 2017 09:50 PM PST While Rutherford's interpretation is intuitive, other interpretations could have been possible. Were there other interpretations, and if so, how were they disqualified in favor of Rutherford Atomic Model? [link] [comments]  |
| Posted: 28 Feb 2017 02:08 PM PST |
| Electron is accelerated in electric field: How are excess energy and momentum accounted for? Posted: 28 Feb 2017 02:53 PM PST Hi, say an electron is passing through a capacitor with an applied dc voltage in a cathode ray tube. The electron is accelerated onto one of the capacitor plates and hence gaining energy and momentum. How is this accounted for in the electric field? Does the electric field get weaker? If so, why and how? I am also asking related to nonlinear optics. Here, one often speaks of the electric field of a laser pulse which is accelerating electrons (and then issuing second harmonic generation and all that). Does the electric field of the laser pulse then gets weakened? I find that hard to imagine, although the excess energy and momentum of the electron have to come from somewhere. Thanks! [link] [comments]  |
| Posted: 28 Feb 2017 08:33 PM PST |
| Why is alcohol so associated with male violence when it is supposed to lower testosterone? Posted: 28 Feb 2017 08:17 PM PST I've stated the relationship crudely here and am probably missing nuances. Alcohol is associated with all kinds of forms of violence, especially with young men- bar fights, rape, murder, not to mention reckless "testosterone driven" acts like drag racing. But it is supposed to put a damper on testosterone as well. Why doesn't alcohol inhibit testosterone enough to prevent people, especially young men, from doing these things? [link] [comments]  |
| Posted: 28 Feb 2017 07:35 PM PST |
| What would a collision between a star and a planet look like? Posted: 28 Feb 2017 08:55 AM PST In the event that an Sol-sized star and an Earth-sized planet crashed directly into each other, what would the resulting impact look like?
I assume a head-on collision to avoid complications of the planet breaking up due to tidal forces in orbit, turning into a ring, etc - This planet is simply plowing into the star. [link] [comments]  |
| What would be the "reaction" to gravity's "action"? Posted: 28 Feb 2017 06:09 PM PST So I just wanna start by saying I'm in no way a science-y person. I've always beeen a very curious person and I'm really fond of knowledge and constantly trying to learn new things, and I thought for a long time that I loved science, until I took high school chemistry and found out that I don't really care much for the scientific method. So my science knowledge doesn't go much farther than a high school level, but my curiosity is still high, and thus I was wondering: Newton states in his third law of motion that "every action has an equal reaction" (obviously paraphrased but you get the idea). So if in this case, gravity is our "action", what would be the "reaction"? What acts in the other direction (up?) andmaintains us in balance enough to not be crushed by the force of gravity [link] [comments]  |
| Are there infinetly many prime numbers? Posted: 28 Feb 2017 02:46 PM PST Are the prime numbers infinite or is there a point on which the numbers get so big it that the propability of them being prime is as good as zero? Because when the numbers get bigger the prime-frequenty gets lower so is there a point where this reaches zero? [link] [comments]  |
| [Mathematics] Does any succesive application of roots have a limit? Posted: 28 Feb 2017 02:23 PM PST As in, if you get the square root of the square root of the square root of the square root... of a number. Does it ever approach anything or does it get arbitrarily close to zero? Also, if you get the nth root of a number, and then take the n+1th root and then the n+2th, and so on. Do these operations ever converge to some value? I'm a fan of math but don't really know much about calculus and such, so if the answer is complicated, I'd appreciate the usage of layman terms. [link] [comments]  |
| Are there any fluids that can exist in a vacuum? Posted: 28 Feb 2017 07:04 AM PST A gas would immediately dissipate, and a liquid would boil and dissipate. Even mercury at the top of a manometer is under it's own vapor pressure. Are there any fluids that hold together? [link] [comments]  |
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