What does it mean to “solve” Einstein's field equations? |
- What does it mean to “solve” Einstein's field equations?
- Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology
- If most matter gets hot as it expands and cools as it contracts, why is it that Freon refrigerant cools down as it goes through expansion?
- Since spacecraft are electrically floating ground, are there any issues with docking spacecraft that are a different voltage potential? And since near-earth space is filled with a very thin electrically charged plasma, does this cause a charge to accumulate?
- [mechanical engineering/planatery] why is 3 km/s considered as hypervelocity?
- How does zero gravity affect human physiological processes?
- Why is epinephrine a dopamine agonist?
- Is there any truth to the idea of the "lost continents"?
- Why are mid-ocean ridges “staggered” (leading to transform boundaries)?
- Why aren't the relative melting and boiling points of metals consistent?
| What does it mean to “solve” Einstein's field equations? Posted: 26 Oct 2021 07:53 AM PDT I read that Schwarzschild, among others, solved Einstein's field equations. How could Einstein write an equation that he couldn't solve himself? The equations I see are complicated but they seem to boil down to basic algebra. Once you have the equation, wouldn't you just solve for X? I'm guessing the source of my confusion is related to scientific terms having a different meaning than their regular English equivalent. Like how scientific "theory" means something different than a "theory" in English literature. Does "solving an equation" mean something different than it seems? Edit: I just got done for the day and see all these great replies. Thanks to everyone for taking the time to explain this to me and others! [link] [comments]  |
| Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology Posted: 27 Oct 2021 07:00 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Biology, Chemistry, Neuroscience, Medicine, Psychology 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]  |
| Posted: 27 Oct 2021 01:10 AM PDT I'm learning about the refrigeration cycle and this is confusing to me as I've always read how objects expand when hot (metal, water, wood, etc) and contract when cool. [link] [comments]  |
| Posted: 26 Oct 2021 10:47 AM PDT |
| [mechanical engineering/planatery] why is 3 km/s considered as hypervelocity? Posted: 26 Oct 2021 09:10 AM PDT going by this wikipedia article on hypervelocity wouldn't it be more accurate to describe it as hypersonic? afte rall in space we have hypervelocity objects flying closer to a few thousands of kilometers per second with the highest theoretically calculated being 48,000,000 km/h or 13,333 km/s which does make the hypervelocity limit on earth seem a bit too low to coin it as such [link] [comments]  |
| How does zero gravity affect human physiological processes? Posted: 26 Oct 2021 05:48 PM PDT I'm assuming that a lot of human body processes rely at least in part on gravity being a factor (blood flow, swallowing food, etc), does anyone know if astronauts have to do anything special to counteract this, or does zero G not affect those kinds of things at all? [link] [comments]  |
| Why is epinephrine a dopamine agonist? Posted: 26 Oct 2021 02:48 PM PDT I know epinephrine is made out of dopamine, so it makes sense that dopamine is an epinephrine agonist, but why the opposite is also true? What is the mechanism behind it? [link] [comments]  |
| Is there any truth to the idea of the "lost continents"? Posted: 26 Oct 2021 06:01 PM PDT I'm not talking about Pangea or Gondwana, but for example Zealandia, "the 8th continent". This video has a lots of views and likes and makes me confused. Are a lot of people being tricked into believing nonsense? https://www.youtube.com/watch?v=NmFUFnMj5Jw [link] [comments]  |
| Why are mid-ocean ridges “staggered” (leading to transform boundaries)? Posted: 26 Oct 2021 09:52 AM PDT I can picture how two offset spreading centers leads to a transform boundary, but why should they be offset in the first place? Why should there be many mini-transform boundaries along a mid-ocean ridge, instead of the ridge just being a uniform line (or curve in the Earth's case)? Just something that occurred to me when seeing a map of plate boundaries. [link] [comments]  |
| Why aren't the relative melting and boiling points of metals consistent? Posted: 25 Oct 2021 05:13 PM PDT Why does tin have a low melting point but a very high boiling point when zinc has a higher melting point than tin but a much lower boiling point? Shouldn't the inter-atomic forces that make a higher melting point also make a higher boiling point? [link] [comments]  |
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