What are the technological hurdles that need to be overcome in order to create a rotating space station that simulates gravity? |
- What are the technological hurdles that need to be overcome in order to create a rotating space station that simulates gravity?
- Why isn't atmospheric CO immediately oxidised to CO2 by oxygen in the air?
- If you were traveling forward as fast as a bullet, what would happen if you shot a bullet towards the direction you were heading?
- Does Hawking Radiation violate Baryon Number conservation?
- Ask Anything Wednesday - Engineering, Mathematics, Computer Science
- How can the speed of light be constant?
- Alternatives to the Linde-Process for producing nitrogen?
- Do the Strong and Weak Forces have a field like Gravitation and EM?
- Can anyone point me to an explanation of the greenhouse effect written by a physicist?
- What actually happens to a Guitar string on a physical level that results in a different note playing after being tightened?
- How many vertebrates are there on earth?
- As gamma waves became CMB, at what rough time in the Universe's history did they red shift through visible light?
- How does airplanes and helicopters behave with respect of Earth once they take off?
- Why was the transistor such an important breakthrough?
- What is healthier for the phone battery?
| Posted: 29 Aug 2018 03:10 AM PDT I understand that our launch systems can only put so much mass into orbit, and it has to fit into the payload fairing. And looking side-to-side could be disorientating if you're standing on the inside of a spinning ring. But why hasn't any space agency even tried to do this? [link] [comments]  |
| Why isn't atmospheric CO immediately oxidised to CO2 by oxygen in the air? Posted: 29 Aug 2018 05:50 AM PDT Is oxygen just not a powerful enough oxidising agent? [link] [comments]  |
| Posted: 28 Aug 2018 11:01 PM PDT |
| Does Hawking Radiation violate Baryon Number conservation? Posted: 28 Aug 2018 08:17 AM PDT Since Hawking Radiation doesn't consider the types of particles that entered the black holes, doesn't that mean at some point baryon number conservation is violated? Since Hawking Radiation is an explanation of quantum effects, shouldn't it be in agreement with current quantum theory? As far as I know Hawking Radiation and Baryon Number Conservation are both generally accepted, but how can they be reconciled? [link] [comments]  |
| Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 29 Aug 2018 08:12 AM PDT 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]  |
| How can the speed of light be constant? Posted: 29 Aug 2018 06:57 AM PDT Sorry, this is just a collection of thought, and I dont have any hard facts to back me up, but I have thought a lot about it. The speed of light is constant and is used in a few equations such as E=MC2. My ultimate question is that if speed is relative then would physics change at near light speed? If you are in a car moving 10 m/s north, and you pass another car moving at 9 m/s then relative to you the car is moving at 1m/s south. So by the same logic if you are standing on earth looking at a star, and rocket were to speed towards that star at 1000 m/s then to the person on earth the light is moving at the speed of light. However to space ship moving directly towards the star the light would be moving at the speed of light plus 1000 m/s, the speed of the ship. If there is something in there that is logically unsound then here is another example. Speed is defined as distance traveled over time. However, as you approach the speed of light time and distance dilate. Due to this dilation we can assume that time and space are relative, and as such speed (which time and space make up) is also relative. Do I have some form of a misunderstanding? If speed is relative then we can assume that the speed of light is relative. If that universal constant isn't constant relative to another position then would physics act differently where that speed is different? Again, sorry about how this might have not made much sense. I am not sure how to explain it better. [link] [comments]  |
| Alternatives to the Linde-Process for producing nitrogen? Posted: 28 Aug 2018 02:33 PM PDT I know about the Linde-Process but are there any other (cheeper) processes to get pure nitrogen out of the air and how do they work (industrial not lab. scale)? I can't find much in the internet about the membran-process. How does it work and do you know good sources? Thanks for your answer! [link] [comments]  |
| Do the Strong and Weak Forces have a field like Gravitation and EM? Posted: 28 Aug 2018 09:43 AM PDT |
| Can anyone point me to an explanation of the greenhouse effect written by a physicist? Posted: 28 Aug 2018 09:28 AM PDT This is a crosspost from askphysics, but since they're a fairly small sub, I was hoping it would be ok to share it here. https://www.reddit.com/r/AskPhysics/comments/9b06wd/physics_of_greenhouse_effect/ I'm having difficulty understanding how greenhouse gases (GG) "trap" infrared radiation (IR). As I understand it, carbon dioxide (CO2) absorbs IR in a few narrow bands of wavelengths (4.3 and 15 micrometers). A CO2 molecule that absorbs a photon will vibrate until it can emit a photon of its own. A few questions for those of you who've studied thermodynamics;
Thanks to all who take the time to help explain... [link] [comments]  |
| Posted: 28 Aug 2018 09:23 PM PDT |
| How many vertebrates are there on earth? Posted: 28 Aug 2018 09:04 AM PDT I'm trying to find an estimate of the total number of vertebrate animals on earth--not species, but population of individual vertebrates. I can only find various sources (1,2) that estimate subsets of vertebrates (for instance, livestock chickens is estimated to be 19.6 billion alone)3, and many more that get into individual subsets, but I'm hoping to find something that estimates all vertebrates from lower chordates to primates. Sources: 1 https://en.wikipedia.org/wiki/Lists_of_organisms_by_population [link] [comments]  |
| Posted: 28 Aug 2018 07:40 AM PDT This has bugged me for years. I am perfectly content with CMB as evidence for the big bang and all that, but, given that gamma waves were simply shifted down into longer wavelengths, this raises the implication that at some point, everywhere you looked, it would have been violet. Then indigo, then blue, etc. Do we have any idea when this might have happened in the Universe's history? Even approximately? [link] [comments]  |
| How does airplanes and helicopters behave with respect of Earth once they take off? Posted: 28 Aug 2018 01:10 PM PDT I can't wrap my head around how a flying object, like an airplane or helicopter, behave once in flight with respect of the Earth. Let me explain: consider a flight from Frankfurt to Capetown, almost straight north-south route: does the plane flight in a straight north-south line or does it need to "correct" because the earth is actually "escaping" under it, thus flying in an oblique line from the initial point of view? Does it "feel" earth rotation? Does it need to point towards the position of Capetown at the time of take-off or at the time of landing? Similarly, if an helicopter simply takes off and stays up indefinitely, does it stays over the same point? I expect the answer being yes; in this case, is it due to some sort of drag from the atmosphere or because helicopter and earth are actually in the same system and are tied together? Sorry for: question being eventually stupid, me being a little drunk and English not being my language. [link] [comments]  |
| Why was the transistor such an important breakthrough? Posted: 28 Aug 2018 02:20 PM PDT What makes it a necessary part of computers and how does it work? [link] [comments]  |
| What is healthier for the phone battery? Posted: 28 Aug 2018 10:33 AM PDT Don't know where to ask it, so might as well put it here. Lets say my smartphone needs to be constantly connected for a long period of time to the computer, even though the battery is already full. In this case what would be better in preserving the battery in the long run, leaving the screen turned on or off? Is there even a difference? [link] [comments]  |
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