| How does the gate bias in a Tunnel Field Effect Transistor align the conduction band of the intrinsic region with the valence band of the P region? Posted: 21 Jul 2016 03:45 AM PDT I understand that once aligned, the electrons can tunnel through the boundary, but I don't understand how the applied voltage at the gate "aligns" the two bands. submitted by /u/bling1523 [link] [comments] |
| Can someone explain why current lags voltage by 90 degrees in an inductor and leads by 90 degrees in a capacitor? Posted: 21 Jul 2016 01:42 AM PDT I can prove these to myself through equations but I don't have an intuitive idea of why it does that? and intuitively explain why it has to be by 90 degrees? And also if you are feeling extra nice how this links to reactive power in the power system? submitted by /u/20j2015 [link] [comments] |
| Is it possible to skydive on the moon? If so, at what height? Posted: 20 Jul 2016 05:49 PM PDT If the moon has 1/6th the gravity of the earth, could you skydive at a lower level than on earth? Recreational skydiving height on earth is usually 10,000 feet (3,050 meters). At what height would you float away upon 'jumping?' submitted by /u/J_for_Jules [link] [comments] |
| What is the total linear momentum of the universe? Posted: 21 Jul 2016 06:59 AM PDT If momentum is conserved in all closed systems, then what is thought to be the total momentum of the universe? My intuition says that it should be zero because anything else seems to imply that the universe was moving at the big bang and that it's center of mass is moving now. If this is not the case, what are other implications of this? submitted by /u/Nowhere_Man_Forever [link] [comments] |
| Is there any correlation between spoken language and genetic jaw and mouth muscles? Would speaking one language over generations produce different mouths with enough time? Posted: 21 Jul 2016 03:11 AM PDT I ask this as I was watching a documentary and I noticed that the Japanese in it spoke using muscles I don't normally see being used in English. I noticed too that they had a more pronounced upper lip (which appears to be used more in the language). submitted by /u/Sir_Whisker_Bottoms [link] [comments] |
| Does the existence of tectonic plates mean less fossils?? Posted: 20 Jul 2016 07:49 PM PDT So the way tectonic plates work is that one slides under another, right? So would that mean that certain fossils in particular areas would have been sucked down with the plates... Or is it a much deeper level of the planet that is getting pulled down? submitted by /u/kotopaz [link] [comments] |
| Charged particles emit synchrotron radiation when accelerated. Do the constituent quarks in a neutron also produce this radiation? Posted: 21 Jul 2016 07:22 AM PDT When a charged particle undergoes acceleration, it emits synchrotron radiation. It seems to stand to reason that a single quark would also exhibit this characteristic, so what about a neutron? A neutron has no charge overall, but the three quarks that make up a neutron are all charged. submitted by /u/ThermosPotato [link] [comments] |
| What properties of different materials make them adept at being exo or endothermic? Posted: 21 Jul 2016 07:07 AM PDT I was thinking about this for quite a bit recently. For example, what about the coolant in a car makes it good at being a good or what makes water a good insulator? submitted by /u/Funky_Ducky [link] [comments] |
| What makes burning coal more efficient than solar energy? How is it able to power entire cities vs solar power? Why is one preferred over the other? Posted: 21 Jul 2016 03:03 AM PDT Three follow-ups and the main body question: 1) What makes burning coal more efficient than solar energy? 2) How is burning coal able to power entire cities vs. solar energy? 3) What makes burning coal preferrable to solar these days and finally... 4) What would it take to put an entire city like new york on Solar Energy? EDIT: Not sure if I have the right flair. Please tell me which one I should change it to if this is the wrong one. submitted by /u/BreAKersc2 [link] [comments] |
| What planetary conditions, other than those we have on Earth, could support life? Posted: 21 Jul 2016 06:37 AM PDT Obviously we have planetary conditions that can support life on Earth. Liquid water, habitable zone within the galaxy and solar system are all things that seem necessary. However, I was curious if there were some lesser known ways of supporting life. I have heard Steven Hawking discuss breathable methane as opposed to breathable oxygen. I'm looking for answers similar to this theory. submitted by /u/bigmombajackson [link] [comments] |
| Does practicing a language before sleep improve its retention/consolidation? Posted: 21 Jul 2016 06:32 AM PDT So I understand sleep is important in memory retention/consolidation. I recently started using Babbel (a language learning app), so I'm wondering if it would be useful to use the app right before going to sleep? submitted by /u/rowan771 [link] [comments] |
| In group dynamics, what are the factors determining if external pressure leads to stronger internal resolve or dissolving/splitting up? Posted: 21 Jul 2016 06:28 AM PDT |
| Are the ocean waves around the world really different? Posted: 21 Jul 2016 02:33 AM PDT I am very interested in traditional boats. I wrote my masters on them. My thesis was about what shaped a specific kind of traditional boat. I discussed tools, materials, aestethics and strict functionality when it comes to use and local conditions. Almost everywhere I ran into the "fact" that the waves and seas are different. That boats from a certain area have a given hull shape because it's the best in the kind of seas they have there. Along the Norwegian coast for instance, you have the boat fromt he northern part compared to the boat from the western area. I have sailed in both areas and I can't understand how the waves are different. There are very local conditions that might be uniqe. There might be shoals out in the ocean near the mouth of a fjord for instance, but that only makes a special wave system in a very certain spot. A fisherman would usually have to sail over a much bigger and varied area, wich would then pretty much be the same in the north and in the south of Norway - as well as pretty much every else on the planet where the coast and the bottom of the ocean is somewhat similar! I understand and know from first hand experience how waves behave different depending on the depth and at what angles and how strong the wind and the current is. But can seas really be that much different, and why? Salidity? Temperature? submitted by /u/Peddyslate [link] [comments] |
| If the Uncertainty Principle prohibits us from measuring the precise position of a particle, how can we ever "collapse" that particle's probability wave? Posted: 21 Jul 2016 05:15 AM PDT The Probability Wave collapses when we measure a particle's precise position (or does it? I may be misunderstanding), so doesn't the Uncertainty Principle prohibit us from doing so? Sorry, middle schooler here; my understanding of physics is lacking. submitted by /u/adeebchowdhury [link] [comments] |
| Is it possible to make baking soda (sodium bicarbonate) from organic matters? Posted: 21 Jul 2016 01:02 AM PDT I heard that you can make calcium hydroxide from seashells and charcoal. That's about it. Is it possible to make sodium bicarbonate from seashells and ashes (from burning firewood)? submitted by /u/RespublicaCuriae [link] [comments] |
| What specific properties make an object edible/digestible? Posted: 21 Jul 2016 12:23 AM PDT Bonus questions: Is there a difference between edible and digestible? Does something have to be organic to be edible? What is the best example of something that is displays minimal amounts of edible properties, but is still technically edible? submitted by /u/Toasted_Roast [link] [comments] |
| How much have our differances in food preference been shaped by history, evolution? Posted: 20 Jul 2016 11:29 PM PDT Just looking at the vast differences in cuisine around the world and some of the tasteful native foods that other cultures aren't fond of such as Rakfisk (salted and fermented fish from norway,) durian fruit, kimchi, tripe, vegemite, cheeses from Italy containing live mites and maggots, etc. For example, would somebody of Aboriginal Australian heratige who grew up in Canada be as likely to enjoy Poutine as much as a native Canadian? submitted by /u/Lkjhgb [link] [comments] |
| Is there a physical limitation on how fast a signal can get from one part of the body to anotner? Or even thought for that matter? If so, how do you train to get faster? I may have phrased this poorly. Posted: 20 Jul 2016 07:13 PM PDT |
| Have traditional cancer treatments, such as chemotherapy and surgical excision, improved in the past few decades? Posted: 20 Jul 2016 11:28 AM PDT Improved as in increasing survival rate or decreasing increasing remission rates. I ask because, with all of these new cancer treatments going around and being researched, we might be overlooking how much our usual standard of care has improved. Also, has it improved for specific cancers among others? Like Head and Neck cancer, Melanoma, or hard to remove cancers like brain tumors? submitted by /u/lulzcakes [link] [comments] |
| Is it possible for a murderer to have PTSD caused by them murdering someone? Posted: 20 Jul 2016 12:18 PM PDT |
| Speed of air entering an evacuated tube? Posted: 20 Jul 2016 08:06 AM PDT Over on /r/hyperloop is a discussion of a video about catastrophic failure of the Hyperloop tube. The nut of the issue is this: Picture a 2-meter diameter tube many kilometers long -- say, 100km to have a number. The tube is evacuated to a pressure of 1 millibar. Now picture a catastrophic failure (an explosion, say) which instantly severs the tube. Air rushes into the tube at some speed. At what speed does the pressure front move along the tube? Speed of sound? Higher? Lower? submitted by /u/fernly [link] [comments] |
| Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology Posted: 20 Jul 2016 08:05 AM PDT 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! submitted by /u/AutoModerator [link] [comments] |
| What is the physical difference between conduction and convection? Posted: 20 Jul 2016 09:26 AM PDT I know the textbook definitions, but what is the real difference between these forms of heat transfer? It seems like, in any instant, moving air would collect heat by conduction, but then is replaced by the next "lump" of air. Is there an additional effect that convection adds or is it just conduction to a moving fluid? submitted by /u/KingLarryXVII [link] [comments] |
| Would balls placed randomly on a smooth rotating planet tend to roll toward the equator? Posted: 20 Jul 2016 08:34 AM PDT |
