How fast would a metal object have to move through Earth's magnetic field to generate significant electrical current?

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• How fast would a metal object have to move through Earth's magnetic field to generate significant electrical current?
• Is it possible for two colliding neutron stars to be sufficiently low-mass that a black hole does not form?
• Is it possible to focus natural light into a high density solar beam with modern technology?
• How do computers get an exact value for integration and derivatives?
• Is there a limit to how much hair a human can grow?
• If, from earth, we can see Venus as a white-pinkish dot, would we see the Earth as a blue dot if we were on Venus? Assuming that ideally there were no clouds and the sky was clear.
• Are there any radioisotopes that we can visibly watch decaying?
• Can heat be blown by the wind?
• As an electron moves across a voltage difference, is it emitting virtual particles and/or actual photons to accommodate the reduction in energy?
• Does turning bathroom vents off and unplugging small appliances (coffee makers and toasters) conserve enough energy that it will actually save money on electric bills?
• Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science
• In a neutron, is it possible for the up quark to decay into a down quark?
• How can scientists accurately measure the populations of insects?
• Why doesn't the integral from 0 to infinity of sinx dx equal zero?
• How do quantum fluctuations- particles appearing from nothing and annihilating each other- follow the law of conservation of matter and energy?
• How do the physics behind playground swings work?
• Why would gold particles with fewer neutrons end up having a larger nucleus?
• How can pain relievers like ibuprofen sometimes eliminate pain when all they really address is the sensitivity of nociceptors after tissue damage, not the nociceptive response to noxious stimuli in the first place?
• Why do people black out when they reach a certain amount of pain?
• Can cobalt (or any other metal) trigger ones sensitivity if it's bound up in a molecule?
• Does the DNA in our semen change over time?
• Is dolphin/whale communication instinctive or do they have to learn it like humans do?

How fast would a metal object have to move through Earth's magnetic field to generate significant electrical current? Posted: 17 Oct 2017 03:54 PM PDT Say you have a 10 meter long conductor. How fast would it need to move to generate a few milliamps? Enough to light a low power LED? submitted by /u/banksjh [link] [comments]

Is it possible for two colliding neutron stars to be sufficiently low-mass that a black hole does not form? Posted: 17 Oct 2017 06:11 PM PDT submitted by /u/pavel_lishin [link] [comments]

Is it possible to focus natural light into a high density solar beam with modern technology? Posted: 17 Oct 2017 05:55 PM PDT I've read John Ringo's Try Rising Series. The starting point for this question. (P.S. I'm saying beam instead of L.A.S.E.R) I also caught a decent xkcd on the subject of focusing natural sunlight into a tight beam and basically calling it complete BS. 3. I'm wondering if there's any way you can use fiber optics or any other material to collect a large amount of naturally occurring light to condense it into a tighter beam. I realize beam may be subjective, but understand it to have minimal diffraction/loss of energy over long distances and the spread to be less than .001% type of thing. Could it be possible to use highly confined magnetic-fields to bend the directions of light into tighter beams, sort of like a solenoid? Finally, (stepping into a bit of Sci-fi), If we could master creating highly localized gravitational fields, would it then be possible to take large amounts of light from a source like the sun and focus it into long continuous beams, since we know through gravitational lensing that we can seriously affect the trajectory of light? Thank you, submitted by /u/cptncivil [link] [comments]

How do computers get an exact value for integration and derivatives? Posted: 17 Oct 2017 06:04 PM PDT It seems like doing calculus involves a lot of intuition that would be hard for a computer, like a graphing calculator or WolframAlpha, to do. submitted by /u/ddotquantum [link] [comments]

Is there a limit to how much hair a human can grow? Posted: 17 Oct 2017 06:05 PM PDT Not just on your head, but everywhere submitted by /u/mista_rida_ [link] [comments]

If, from earth, we can see Venus as a white-pinkish dot, would we see the Earth as a blue dot if we were on Venus? Assuming that ideally there were no clouds and the sky was clear. Posted: 18 Oct 2017 01:11 AM PDT submitted by /u/NoweShadow [link] [comments]

Are there any radioisotopes that we can visibly watch decaying? Posted: 17 Oct 2017 02:34 PM PDT submitted by /u/xXswagmeisterXx [link] [comments]

Can heat be blown by the wind? Posted: 18 Oct 2017 05:46 AM PDT More specifically, can wind affect the path of thermal radiation? When you're sitting next to a campfire and the wind shifts towards you, you get a face full of smoke and heat. But is that wind affecting the thermal radiation pathing or is the wind really just pushing the hot water vapor (steam) that's a consequence of combustion? submitted by /u/MuffMagician [link] [comments]

As an electron moves across a voltage difference, is it emitting virtual particles and/or actual photons to accommodate the reduction in energy? Posted: 17 Oct 2017 10:55 PM PDT Im trying to understand some aspects of electromagnetism. Initially I was thinking about what makes lightning visible submitted by /u/37litebluesheep [link] [comments]

Does turning bathroom vents off and unplugging small appliances (coffee makers and toasters) conserve enough energy that it will actually save money on electric bills? Posted: 17 Oct 2017 04:29 PM PDT submitted by /u/notgraceful11199 [link] [comments]

Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science Posted: 18 Oct 2017 08:07 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Physics, Astronomy, Earth and Planetary 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! submitted by /u/AutoModerator [link] [comments]

In a neutron, is it possible for the up quark to decay into a down quark? Posted: 17 Oct 2017 06:54 PM PDT If it's possible would the charge be -1 since down quarks have a charge of -1/3(as far as I know)? submitted by /u/DiaperDaddy69 [link] [comments]

How can scientists accurately measure the populations of insects? Posted: 17 Oct 2017 05:49 PM PDT submitted by /u/AethonMT [link] [comments]

Why doesn't the integral from 0 to infinity of sinx dx equal zero? Posted: 17 Oct 2017 03:39 PM PDT Hello. Kind of stumped on this problem from a conceptual stand point. If you graph sinx, each area above the x- axis should cancel out with the area below the x-axis so I'm not sure why we can't say it's equal to zero. submitted by /u/pjc013 [link] [comments]

How do quantum fluctuations- particles appearing from nothing and annihilating each other- follow the law of conservation of matter and energy? Posted: 17 Oct 2017 07:01 PM PDT This has been bugging me for a while and I cant find a good answer to this. submitted by /u/leonardmatt [link] [comments]

How do the physics behind playground swings work? Posted: 17 Oct 2017 12:30 PM PDT How is energy from "pumping" or leaning backwards / forward and extending legs converted into motion? submitted by /u/gENTlemanMatthew [link] [comments]

Why would gold particles with fewer neutrons end up having a larger nucleus? Posted: 17 Oct 2017 04:44 PM PDT I was reading Wallermoth et al. (1989) and they described neutron deficient gold nucleii as having greater radius than some heavier isotopes. Why might this be? The paper mentions proton spins at some point, would this be relevant? submitted by /u/chris_bryant_writer [link] [comments]

How can pain relievers like ibuprofen sometimes eliminate pain when all they really address is the sensitivity of nociceptors after tissue damage, not the nociceptive response to noxious stimuli in the first place? Posted: 17 Oct 2017 03:31 PM PDT It seems like this would just keep the pain from getting worse by inhibiting the production of prostaglandins and keeping the nociceptive threshold normal, not relieve the pain present at the normal threshold being caused by the underlying stimulus. Is it because ibuprofen also inhibits the production of prostaglandins that result in inflammation, and inflammation is the underlying pain stimulus that's being eliminated? If that's the case, is ibuprofen unable to relieve pain that isn't caused by inflammation? submitted by /u/SleepingMonad [link] [comments]

Why do people black out when they reach a certain amount of pain? Posted: 17 Oct 2017 01:40 PM PDT Why do our bodies do this? Does the blacking out protect us? How exactly do we black out from so much pain, what is the process within our body that decides the amount of pain we are experiencing is too severe and we have to go to sleep? edit: rewording submitted by /u/temporubat0 [link] [comments]

Can cobalt (or any other metal) trigger ones sensitivity if it's bound up in a molecule? Posted: 17 Oct 2017 08:26 PM PDT People with cobalt allergies and sensitivities are warned to stay away from ingesting b12 as a supplement. Is this due to the Co atom in cyanocobalamin or is it the leftover reagent from manufacturing? To continue with that, do cobalt containing steels pose a similar risk? And should this be flaired biology or chemistry? submitted by /u/littledragonroar [link] [comments]

Does the DNA in our semen change over time? Posted: 17 Oct 2017 09:05 PM PDT For example at 22 I'm fat but at 26 I'm ripped and strong. Will my DNA in seen change was we do? Maybe depending on how you're your at a certain spot in time will your children be more likely to be as you are now submitted by /u/eduwills69 [link] [comments]

Is dolphin/whale communication instinctive or do they have to learn it like humans do? Posted: 17 Oct 2017 10:53 AM PDT If they have to learn it, are there multiple "languages" from different places on Earth? submitted by /u/HenryFrenchFries [link] [comments]

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