From my kid: Can you put a marshmallow on a stick out into space and roast it with the sun? |
- From my kid: Can you put a marshmallow on a stick out into space and roast it with the sun?
- On my bike: is it more efficient to pedal fast in a low gear or slower in a high gear?
- Is it a coincidence that the moons rotation around its axis matches the duration for its revolution around the earth? Or is there some scientific explanation on how these aligned in such a fashion?
- How, or why, do refraction and dispersion occur?
- I measured an imaginary component of Earth's magnetic field?
- Why can't powerbanks charge while being charged?
- Ask Anything Wednesday - Engineering, Mathematics, Computer Science
- Why are radio waves and microwaves more damaging to the human body than light waves?
- In my Psychology textbook it says that cortisol (a result of stress) reduces telomerase activity, therefore speeding up the aging process, however, I know that exercise also releases cortisol, yet is known to combat aging - how?
- Why do planets orbit in planes?
- Why don't electrons in a superconductor radiate away their energy?
- Can blue light cause cancer? What about UVA? Where is the threshold?
- Why do antiparticles go back in time? For example, when using Feynman diagrams.
- Do we create memories of every single event that happens to us?
- Can dogs, in theory, talk?
- Which is more biologically dangerous, X-rays or Gamma rays?
- Why don't the absorption lines and emission lines in stars cancel out?
- Is there any specific unit or measurement system for poisoning levels in general?
- Do people with bionic limbs still experience phantom pain?
- How is voltage created in a battery cell and how is it maintained at a ~constant value throughout its life/usage?
- Will consistent pressure (i.e. Mewing, Palate Expansions, Chewing, Clenching, etc.) have an effect on Cranio-Facial development?
| From my kid: Can you put a marshmallow on a stick out into space and roast it with the sun? Posted: 21 Nov 2017 06:31 PM PST I assume the answer is yes, given the heat of the sun, but... How close would you have to be? Could you do it and remain alive to eat your space s'more given a properly shielded spacecraft? Would the outside of the marshmallow caramelize? How would the vacuum of space affect the cooking process? [link] [comments]  |
| On my bike: is it more efficient to pedal fast in a low gear or slower in a high gear? Posted: 22 Nov 2017 06:05 AM PST As there is sometime confusion:
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| Posted: 22 Nov 2017 06:00 AM PST |
| How, or why, do refraction and dispersion occur? Posted: 22 Nov 2017 04:05 AM PST I'm an A-level physics student and we've just covered refraction and dispersion. Our teachers have said we don't need to know why and how they happen but I'd like to know because it'll help me understand everything. They tried to explain but they've told me so many things that contrast that I don't know what's what any more. Here's what they've said to me about dispersion: "It's because frequency is variable." "Frequency is constant and cannot change so it's the wavelength." "It's because the different wavelengths of EM waves travel at different speeds." "Speed is always constant for all EM radiation because it always travels at the speed of light." "It's because the wavelength is variable" - then didn't explain how this affected it. Here's what I've currently done some research to find: Refractive index is different for each different 'colour' of visible light due to the frequency difference so each colour refracts by different amounts. If this is the case, how come we don't get a rainbow in every refraction? Now refraction, which I probably should have started with. I've been told it happens due to the absorption and re-emission of the photons and that this is similiar to what we learned in the photoelectric effect when electrons absorb photons but I've also been told it's due to the oscillating electric field interacting with the greater number of electrons in the denser material causing interference or resistance but I don't understand how this resistance occurs, if this is correct of course. I've been told absorption and emission is both correct and incorrect on different occasions by the same teacher. Many premature thanks, /u/torbear [link] [comments]  |
| I measured an imaginary component of Earth's magnetic field? Posted: 22 Nov 2017 05:13 AM PST We were measuring Earth's magnetic field in three different dimensions to calculate its overall strength and direction (using 3-dimensional Pythagoras). One of the dimensions (we called them x, y, and z, arbitrarily) had a small imaginary value of 6.6x10-5 i Teslas. (This was the dimension we arbitrarily called 'y') This got me researching imaginary magnetic fields, and they are possible and have been measured. But has the Earth itself got imaginary values for the magnetic field at some points or was it a mistake of measurement? BTW our final measurement was 3.49 x 10-5 Tesla at an angle of 74.01 degrees compared to the official measurement at our location of 4.92 x 10-5 Tesla at 68.24 degrees. [link] [comments]  |
| Why can't powerbanks charge while being charged? Posted: 22 Nov 2017 05:04 AM PST |
| Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 22 Nov 2017 07:06 AM PST Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Engineering, Mathematics, Computer Science 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]  |
| Why are radio waves and microwaves more damaging to the human body than light waves? Posted: 21 Nov 2017 06:34 PM PST In science class we learned that exposure to waves with a shorter wavelength are more dangerous (ex. x-rays). We also learned that microwaves and radio waves have a longer wavelength than light. Why, then, are we concerned about microwaves and radio waves causing cancer but not visible light? [link] [comments]  |
| Posted: 21 Nov 2017 08:43 PM PST |
| Why do planets orbit in planes? Posted: 21 Nov 2017 07:02 PM PST Why does the dust orbiting stars that will later form planets lie in the same plane and not in a sphere or cloud around the star? [link] [comments]  |
| Why don't electrons in a superconductor radiate away their energy? Posted: 22 Nov 2017 02:20 AM PST
Am I wrong somewhere? If not, why doesn't the energy of superconducted electrons radiate away? [link] [comments]  |
| Can blue light cause cancer? What about UVA? Where is the threshold? Posted: 22 Nov 2017 06:53 AM PST Since we're on the topic of electromagnetic radiation causing cancer: What's the wavelength that divides cancer causing and non-cancer causing EM radiation? And if it lines up with the edge of what humans can see visually, is that just a coincidence? Is there an evolutionary reason for that? [link] [comments]  |
| Why do antiparticles go back in time? For example, when using Feynman diagrams. Posted: 22 Nov 2017 12:20 AM PST |
| Do we create memories of every single event that happens to us? Posted: 21 Nov 2017 03:49 PM PST I am reading about people who have an autobiographical memory and I find it fascinating. Is the implication though, that normal people are also creating these memories and we just can't access them? Or are these people actually creating more memories? If you enhanced my memory recall, would I be able to go back in time 5 years ago to a specific day and remember exactly what happened in each moment? Or is my brain just not even recording those memories? Or are they being recorded as short term, but only the important ones are being moved to long term and over time the short term is being deleted? Don't get me wrong, I dont want to remember that I ate toast with butter on July 12th, 2012, but I am curious if I Could remember. [link] [comments]  |
| Posted: 21 Nov 2017 05:42 PM PST |
| Which is more biologically dangerous, X-rays or Gamma rays? Posted: 22 Nov 2017 05:30 AM PST In my line of work I perform inspections of aircrafts utilizing X-rays. On my latest safety course, an assertion was made that working with X-ray tubes was more dangerous than to work with ionizing gamma ray isotopes. Is there any truth to this? [link] [comments]  |
| Why don't the absorption lines and emission lines in stars cancel out? Posted: 22 Nov 2017 04:36 AM PST I get how an absorption line is meant to happen -- if a photon of just the right energy interacts with the atom, the photon will be absorbed by the electron, and the electron will be kicked into a higher energy state. But then surely, a short time later, the electron will relax back into the lower energy state and re-emit the photon with the exact same energy. So in a star, where presumably the atoms are absorbing and re-emitting photons all the time, how come these two processes don't "cancel out"? The rate of absorption has to equal the rate of emission. Why, in the starlight, do we still see a deficit of photons with the energies corresponding to e.g. Hydrogen absorption lines? Where have they all gone? EDIT: One way is that the relaxation process can emit multiple photons if the electron was excited to a very high state, but that doesn't work for the n=2 -> n=1 transition. [link] [comments]  |
| Is there any specific unit or measurement system for poisoning levels in general? Posted: 22 Nov 2017 04:28 AM PST I've tried to search on Google, but the closest result I've expected is the unit of Rad) which is an unit for absorbed radiation dose. But what I'm looking for is some kind of poison measurement system that can tell people in general how poisonous some molecules or materials can be(or how lethal some poisons from some snakes are). As an analog, we have weight measurement system like g, kg (in metric system) or pounds, ounces (imperial system) and this system give us an idea in general how heavy and how light some things are. *And sorry for my bad English, as it's not my first language in the first place and I reckon that I'm still learning it everyday... [link] [comments]  |
| Do people with bionic limbs still experience phantom pain? Posted: 21 Nov 2017 05:04 PM PST |
| Posted: 21 Nov 2017 05:18 PM PST I've learned about redox reactions but can someone explain it in a way that deals with the concepts in physics e&m like charge, voltage, work, e field etc... It seems like the amount of chemical "stuff" in the battery has only to do with the amount of work the battery can do, so what creates and maintains the voltage? [link] [comments]  |
| Posted: 21 Nov 2017 07:10 PM PST Theoretically, this should work. Any time you stress bone enough, it creates micro-fractures. If you did this consistently and for long enough, the bone would remodel itself thicker as it repaired the fractures to resist the stress more. I don't think you would have to hit the bone that hard, either. Dunno how visible or permanent any change would be though. Examples of Mike Mew's theories https://www.youtube.com/watch?v=iqlxAdmky10 https://www.youtube.com/watch?v=eh9OqEd5z1k https://www.youtube.com/watch?v=QCNqbvOALZI EVEN MORE PROOF: Facial changes following treatment with a removable orthodontic appliance in adults. http://www.ncbi.nlm.nih.gov/pubmed/15641449 Experimental and postexperimental effects of posteriorly directed extraoral traction in adult Macaca fascicularis http://www.sciencedirect.com/science/ar ... 167990277X Expansion/Facemask Treatment of an Adult Class III Malocclusion http://www.jaypeejournals.com/eJournals ... &isPDF=YES Continuous forces are more effective than intermittent forces in expanding sutures http://www.researchgate.net/publication ... ng_sutures Bone remodeling to correct maxillary deficiency after growth cessation http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3700158/ Age changes in the human frontozygomatic suture from 20 to 95 years. http://www.researchgate.net/publication ... o_95_years sutures dont fuse until the 8th decade of life http://www.ncbi.nlm.nih.gov/pubmed/1062937 skeletal maxillary advancement is possible in adults http://www.ncbi.nlm.nih.gov/pubmed/21211241 [link] [comments]  |
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