Are spiders attracted to heat sources? |
- Are spiders attracted to heat sources?
- Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science
- Is there a name for a series of primes created by adding a digit in front of the previous one?
- Does a vacuum have energy?
- What would happen if antimatter was absorbed into a black hole?
- How are drug quantities measured and filled to the correct size?
- How were quantum orbital shapes discovered/figured out?
- How exactly are quantum tunneling and nuclear fusion related?
- Why in electricity and magnetic field calculations there are pi?
- What makes computers slow down so much over time?
- Is there any celestial object with a strong positive or negative electric charge?
- How can a photon have a mass of zero without violating the mass - energy equivalence?
- How can a single speaker make multiple tones at the same time?
- If neutrinos can move through vast quantities of mass without interacting with it, how are they detected?
- In the theory of Pangaea, why did the earth have such a large land formation on one side of the planet and expansive ocean across the rest?
- Why don't we scale wind turbines down?
- How do whales fend off attacks by other sea creatures?
- How do B lymphocytes divide to form memory cells AND plasma cells?
- How do we achieve average global temperatures from 1900?
- Is adding two images in image space the same as doing so in frequency space?
| Are spiders attracted to heat sources? Posted: 07 Feb 2017 06:29 PM PST Pardon my stupid, I can't remember my 6th grade science. Does cold weather affect spiders negatively? Will they seek out a heat source for survival/feeding/breeding? [link] [comments]  |
| Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science Posted: 08 Feb 2017 07:04 AM PST 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]  |
| Is there a name for a series of primes created by adding a digit in front of the previous one? Posted: 08 Feb 2017 12:07 AM PST Hi, I was reading some cryptography question in another subreddit and it talked about using really long primes to do the encryption, and how making the primes longer would make the system exponentially harder to solve. This got me thinking as to whether there could be series of primes as in the title, for example 3->13, 7->37, but with longer runs, and if they've a name or if they've been studied at all. I used base 10, but I'm interested in any other base as well. Edit/tldr: I'm looking for a prime p with m digits such that p mod 10n for all n<=m is prime Thanks! [link] [comments]  |
| Posted: 07 Feb 2017 03:52 PM PST |
| What would happen if antimatter was absorbed into a black hole? Posted: 07 Feb 2017 07:32 PM PST I'm assuming different sizes/amounts of antimatter and black holes will have a different result too [link] [comments]  |
| How are drug quantities measured and filled to the correct size? Posted: 08 Feb 2017 02:28 AM PST For example. On a box of Chlorphenamine Maleate (an antihistamine) it reads 4mg Tablets. I am aware that 4mg is an incredibly small mass. So if I have a tablet of this then what actually makes up the tablet, because the tablet presumably weighs a lot more than 4mg? Also, how do they precisely put such a small mass of the actual drug component into a tablet? [link] [comments]  |
| How were quantum orbital shapes discovered/figured out? Posted: 07 Feb 2017 04:11 PM PST How were the possible orbital shapes (probability regions of finding electrons) in atoms found? Don't some shapes overlap with others? If you would add all them up in a dense atom, would there still be a place where the probability of finding an electron would be 0? What kind of experiments were done to verify their shapes? [link] [comments]  |
| How exactly are quantum tunneling and nuclear fusion related? Posted: 07 Feb 2017 09:58 PM PST I was taught that quantum tunneling is necessary for nuclear fusion to happen but I am unsure how that exactly happens. [link] [comments]  |
| Why in electricity and magnetic field calculations there are pi? Posted: 07 Feb 2017 10:59 PM PST First of all. English isn't my first language and i'm writing from phone so sorry for that. My question is. Im at the moment studying materialscience in university and our physics class are now studying electricity and magnetic fields generated by electricity. But in calculations there are almost allways pi. Why pi is prominent in these calculations and why "nature" "uses" it in these calculations. For example "biot's and savart's law" (i have no idea what this is in english, but trying to translate it from finnish). [link] [comments]  |
| What makes computers slow down so much over time? Posted: 07 Feb 2017 04:15 PM PST For example, a 5 year old macbook pro that has been factory reset, even running the same OS version and applications, seems slower than it did when it was new [link] [comments]  |
| Is there any celestial object with a strong positive or negative electric charge? Posted: 07 Feb 2017 06:01 PM PST |
| How can a photon have a mass of zero without violating the mass - energy equivalence? Posted: 07 Feb 2017 12:41 PM PST Photons are particles without mass. But whenever a system emits one, it loses a small fraction of its energy, and therefore its mass. However, the photon lacks mass and only transports energy, so conservation of energy is given, while conservation of mass is violated. If the photon is added to another system, the other system gains (although very little) mass. So is a photon transporting mass without actually having any? I'm really confused right now, and might be I just miss something simple here. Thanks in advance for any answers! EDIT: Thank you all for taking the time to write these answers down. They did indeed clarify a lot, concerning my question and giving a lot of further, interesting information! [link] [comments]  |
| How can a single speaker make multiple tones at the same time? Posted: 07 Feb 2017 03:51 PM PST How are, for example, the bass line, drums, guitar and vocals all generated all from one speaker at the same time? [link] [comments]  |
| Posted: 07 Feb 2017 10:10 AM PST Also, if there is some form of interaction, what exactly occurs? [link] [comments]  |
| Posted: 07 Feb 2017 08:27 AM PST Or were there other smaller continents that were consumed by the continents we know now when Pangaea broke up? [link] [comments]  |
| Why don't we scale wind turbines down? Posted: 07 Feb 2017 05:51 PM PST From my understanding, a changing magnetic field makes a steady current. So a wind turbine works when the wind pushes the fan. The fan turns a magnet that's placed near a loop of wire which then generates a current. However, if we were to make it faster, wouldn't that make the current higher and as such the power higher? So in that case, why don't we make the wind turbine smaller and it will oscillate more, thus creating more energy? [link] [comments]  |
| How do whales fend off attacks by other sea creatures? Posted: 07 Feb 2017 10:00 AM PST They're big and slow, what prevents a shark from just taking a while bite by bite? [link] [comments]  |
| How do B lymphocytes divide to form memory cells AND plasma cells? Posted: 07 Feb 2017 11:12 AM PST If B lymphocytes divide by mitosis, which produces genetically identical copies of the original cell, how can two different types of cell be formed?? [link] [comments]  |
| How do we achieve average global temperatures from 1900? Posted: 07 Feb 2017 10:16 AM PST I do believe in climate change of about 1 degree celsius over the past 100 years, most likely caused by pollution. I do not (yet) believe that we know within a fraction of a degree what the global temperatures were 100 years ago... can anyone convince me? My belief in climate change is based solely on very recent science, but it would be nice to learn why I keep seeing studies like this that start in 1880. If the short answer is 'from weather records' can anyone provide a link to the records from, say, January 1st 1990? Or at least the number of stations that were providing temperature data? Someone used this report to argue that there were 4349 stations collecting monthly average temperatures since 1850, but that seems unlikely... and if true would most likely be lots of temperatures for population centers and few for unpopulated places like deserts, oceans, mountains, Antartica etc. It just seems incredibly time consuming and difficult to calculate the average Earth temperature for a year, considering the temperature fluctuates wildly from hour to hour, day to day, location to location. Wouldn't it require at least one thousand weather stations taking measurements the same way, at the same times, several times per day, every day of the year, in an even spread across the Earth's surface (including parts of the Earth's surface that weren't set foot upon at the time)? Sorry for so much doubt, but I really need some education on this subject, and I've not had any luck getting a response from Google or r/ history. Thanks for any assistance! [link] [comments]  |
| Is adding two images in image space the same as doing so in frequency space? Posted: 07 Feb 2017 05:51 PM PST Hey there. I have some doubts regarding image algebra. First, as the title says, is adding (or subtracting) two images in frequency space the same as doing it in image space? By frequency space I mean Fourier domain. One particular example is, if I obtain the low-frequency components of an image, if I subtract that image with its original, do I get the high-frequency components? Or is that only true if I perform the subtraction in frequency space? Second, I was having a discussion with a friend about addition between images. He says that addition of images is the same as the mean of the two images, which I think it's not correct. Well, mean involves a division that addition does not have. But, is he right? Is it the same (mean and addition) if we force normalization of the images along the process? Thanks a lot! [link] [comments]  |
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