How was the first parachute tested? |
- How was the first parachute tested?
- Weight considerations aside, would lining a spacecraft with lead protect astronauts from harmful cosmic radiation?
- Have Insects ever been observed playing?
- Can two circular polarisers be used for polarised microscopy or does it work only with two linear ones ?
- What exactly is Particle-Wave Duality of Light?
- Was Apollo 11's route precalculated and launched independently or did the crew have to fly it manually? If so, how much impact did the crew have mid-flight?
- Why don't nuclear power plants use direct air cycle turbines?
- I'm getting ammonia readings in a confined space with seawater and barnacles. Where does the ammonia come from?
- Is an infinitely self sustaining exothermic chemical reaction theoretically possible?
- What happens if the ISS passes directly above a ground-based optical telescope while it is observing the sky?
- Why does tellurium poisoning make your breath smell like garlic?
- Is it possible to fill a football with just enough helium to match the density of air, making it float in place?
- Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science
- What makes something bouncy?
- How Do Skyscrapers Get Around the Square-Cube Law?
- Does our internal body temperature fluctuate depending on the temperature outside?
- I am learning general principles of sampling, in particular, importance sampling. I am looking for a good explanation for reweighting. Can anyone please explain when and why we need reweighting? What is the intuition behind reweighting in general? What does it accomplish?
- How do hydrocarbons form on other planets, etc.?
- Do galaxies spin like a vortex?
- How does the aiming work for the lunar Laser Ranging Retro-reflector experiment?
- How Can This Paleontology Paper Be Using C14 Dating if the Longest Half-Life of any Carbon Isotope is C-14 (5,730 years)?
- Do fingerprints change as you age? For instance if your fingerprinted at 5 years old will it have any similarity to your fingerprints at 20?
- What is the speed of light in a non-inertial frame of reference?
| How was the first parachute tested? Posted: 02 May 2018 02:59 AM PDT |
| Posted: 02 May 2018 12:50 AM PDT If it could be layered in the outside walls of the craft/station, how thick would the layer need to be? [link] [comments]  |
| Have Insects ever been observed playing? Posted: 02 May 2018 05:33 AM PDT As we know the young of most species engage in some play with their littermates or parents, Has any species of Insects ever been known or documented to have ever played for the sake of enjoyment or is that limited to higher functioning organisms? [link] [comments]  |
| Posted: 02 May 2018 04:53 AM PDT I think I can't use two circular ones but I'm not sure as I'm not 100% sure how the circular ones work. Thanks in advance 🙂 [link] [comments]  |
| What exactly is Particle-Wave Duality of Light? Posted: 02 May 2018 05:45 AM PDT I have read a little bit about Quantum Mechanics and this is a bizarre phenomenon(for someone who didn't take GCSE Physics) that I've come across that isn't explained very well.. So I was wondering if someone can perhaps provide me with a more comprehensive explanation with suitable analogies so that I have a better intuitive understanding of the subject. [link] [comments]  |
| Posted: 01 May 2018 08:55 PM PDT |
| Why don't nuclear power plants use direct air cycle turbines? Posted: 01 May 2018 05:51 PM PDT DACT were successfully spun up during the nuclear propulsion program but nuclear aircraft were not viable for obvious reasons. However they seem to make a lot of sense, why heat steam and run a turbine when you can run the turbine directly off the heat of the core? Wouldn't this be more efficient? [link] [comments]  |
| Posted: 02 May 2018 05:46 AM PDT I work in a coal power plant. Part of the process is using seawater for cooling. Sometimes our monitors detect ammonia inside the confined spaces when the condensers and tunnels are opened to be cleaned. The cleaning involves scraping away the masses of barnacles in these areas. Are the barnacles releasing ammonia somehow? When they die and start to decompose? Could the ammonia be introduced by something else in the seawater? [link] [comments]  |
| Is an infinitely self sustaining exothermic chemical reaction theoretically possible? Posted: 02 May 2018 07:07 AM PDT My thinking is that a chemical reaction, or a group of reactions, create byproducts that can react with each other in a closed environment. If the system is completely isolated, there won't be any gasses/reactants escaping. This would basically be a kind of free energy. Is this theoretically possible? [link] [comments]  |
| Posted: 01 May 2018 10:19 PM PDT |
| Why does tellurium poisoning make your breath smell like garlic? Posted: 01 May 2018 07:06 PM PDT A few months ago, I was assigned to do some basic research on tellurium for a school project. When researching I found out that Tellurium breath has a garlicky odor it never said why though. It is some chemical reaction or just a coincidence? [link] [comments]  |
| Posted: 01 May 2018 04:35 PM PDT It just came across my mind, throwing a football that does not come down. Would it be possible? [link] [comments]  |
| Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science Posted: 02 May 2018 08:13 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! [link] [comments]  |
| Posted: 02 May 2018 07:37 AM PDT |
| How Do Skyscrapers Get Around the Square-Cube Law? Posted: 02 May 2018 07:34 AM PDT |
| Does our internal body temperature fluctuate depending on the temperature outside? Posted: 01 May 2018 08:24 PM PDT |
| Posted: 01 May 2018 04:13 PM PDT I am a student in chemistry. I struggle understanding complicated notations used in statistics papers. [link] [comments]  |
| How do hydrocarbons form on other planets, etc.? Posted: 01 May 2018 08:49 PM PDT Organic chemistry is very much not my strong suit, but I was wondering what the chemical processes involved in hydrocarbons forming without some type of biomass looks like, as on bodies such at Titan. And to add to that, are similar processes found on earth in a notable amount, or do all of our hydrocarbons form from biomass? [link] [comments]  |
| Do galaxies spin like a vortex? Posted: 01 May 2018 10:32 AM PDT (I'm tasked with artistic license on this one) but do galaxies revolve like a vortex; faster towards the center? or is it a static 'bicycle wheel' rotation? also if it is like a wheel, how come? [link] [comments]  |
| How does the aiming work for the lunar Laser Ranging Retro-reflector experiment? Posted: 01 May 2018 11:23 AM PDT How are the earth-based lasers aimed for this experiment? Is it necessary to be accurate down to the precise location of where the reflector is placed on the moon? Or, is there enough beam dispersion over the long distance that you only need to be pointing generally in that direction? [link] [comments]  |
| Posted: 01 May 2018 10:47 AM PDT I understand radioactive decay, but I don't understand how this paper concerning a fossil of 420 million years can use carbon dating (of any isotope) and receive accurate data. Edit: So it seems the paper is not dating the specimen via carbon dating, but instead measuring the ratio of stable isotopes (C-12 and C-13) relative to each other. This makes more sense. Thank you all! [link] [comments]  |
| Posted: 01 May 2018 09:40 AM PDT |
| What is the speed of light in a non-inertial frame of reference? Posted: 01 May 2018 07:17 AM PDT I recently watched a VSauce video where they said that light travels at a constant speed for everyone as long as you aren't accelerating. So what happens when you accelerate? Does the speed of light change, and if so how can we calculate the new speed? [link] [comments]  |
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