Askscience Megathread: Climate Change |
- Askscience Megathread: Climate Change
- What's the biological advantage of metamorphosis/pupating if the process is so energy-consuming (destroying the entire body in the pupa and rebuilding it again, rather than simply growing up) and vulnerable?
- Why can radio waves pass through solid objects?
- As of 2014, there were 10 people left in the world living in iron lungs. Do we not have the technology to remove them safely?
- Considering we have really big micro SD cards and normal sized memory cards, why does RAM memory in computers not go very high comparatively?
- Can we apply statistical mechanics / thermodynamics to a nucleus?
- Is there an end to the electromagnetic spectrum?
- Tensors in engineering mechanics: Can someone explain them to me in an intuitive, satisfying way?
- What causes certain eyes to become red in camera pictures ?
- What is the origin of all the different races we see of people in the world?
- How do astronauts live a normal life in space?
- What release more radiation, Fukishima and Chernobyl Vs every coal power plant ever?
- Does temperature have relativistic effects?
- Why is light reflected from the road polarized?
- What is Lie theory and its application in string theory/gravitational theories?
- How fast can data be transmitted using telegraph wires, with modern machines and transmission protocols?
- Why aren't humans constantly producing STEM cells? And what would the effects possibly be of creating a human who constantly produces STEM cells?
- How much energy total is radiated by all the stars and galaxies in the universe at any given moment?
- What causes plastic to appear to be moving when viewed through an infrared camera?
- What determines if your body will automatically 'revive' itself after various causes of death (drowning and coughing up the water afterwards, heart starting again randomly after other causes of death)?
- What is the 'evil eye' and how many cultures is this present in?
| Askscience Megathread: Climate Change Posted: 01 Jun 2017 08:04 PM PDT With the current news of the US stepping away from the Paris Climate Agreement, AskScience is doing a mega thread so that all questions are in one spot. Rather than having 100 threads on the same topic, this allows our experts one place to go to answer questions. So feel free to ask your climate change questions here! Remember Panel members will be in and out throughout the day so please do not expect an immediate answer. [link] [comments]  |
| Posted: 01 Jun 2017 09:28 PM PDT Not to mention leaving the pupa immobile and completely vulnerable for long stretches of time. Why do almost all flying insects start as grubs, then mature to have wings, rather than just mature to have wings without pupating (like birds)? [link] [comments]  |
| Why can radio waves pass through solid objects? Posted: 02 Jun 2017 12:35 AM PDT |
| Posted: 01 Jun 2017 07:54 AM PDT I stumbled upon this news story, which talks about a man who has been living in an iron lung for the last 5 or 6 decades. I know the iron lung is an outdated and generally obsolete piece of medical equipment, so why can't we feasibly remove someone from it and simply hook them up to a normal positive pressure ventillator? Is it like the 'car-crash-victim-pinned-against-a-tree' kinda scenario wherein removing them would immediately kill them? Or is it just lack of money on their part? I have no medical knowledge so apologies if this a simple question [link] [comments]  |
| Posted: 01 Jun 2017 10:04 PM PDT |
| Can we apply statistical mechanics / thermodynamics to a nucleus? Posted: 02 Jun 2017 04:39 AM PDT If we have a large nucleus (>200 nucleons), then so long as there are no decays or incoming gammas or anything, it's an isolated box of particles with a fixed amount of energy. That means you can find the number of possible states based on the energy levels, and work out an entropy and a temperature. Is this a reasonable thing to do? I imagine you couldn't do it analytically, since the nuclear potential is all kinds of horrible, and there would be things to consider like spin. The nuclear force is short ranged, but the Coulomb force isn't, so protons would be a bigger headache than the neutrons. Also, 200 particles isn't very big compared to the size of the systems we usually talk about with thermodynamics, so maybe the usual approximations like Stirling wouldn't work so well. All that aside, are we able to do anything interesting by looking at the nucleus from a statistical point of view? If there's a temperature, how big is it? Does it say anything about nuclear collisions, or will they be in contact for too short a length of time for anything thermal to happen? Can we get phase transitions? [link] [comments]  |
| Is there an end to the electromagnetic spectrum? Posted: 02 Jun 2017 03:50 AM PDT If Gamma Rays are the highest "end" of the spectrum, (for frequency/energy) is there a limit to how much energy a GR photon can contain? Conversely, is there a limit to how little frequency and energy a radio wave photon can have? [link] [comments]  |
| Tensors in engineering mechanics: Can someone explain them to me in an intuitive, satisfying way? Posted: 01 Jun 2017 04:00 PM PDT That's it. I give up. I've spent a few weeks scouring the internet for a an explanation of tensors in the context of engineering mechanics. You know, the ones every engineering student know and love (i.e. stress, strain, etc.). But alas, I cannot find any explanations of tensors without running into crazy abstract formalisms like "homomorphisms" and "inner product spaces". I'm not looking for an explanation of tensors using abstract algebra or infinitesimal, generalized vector spaces. I just want some clarification on what the heck they actually mean and are doing in the nice 3D, Euclidean space, especially in the context of mechanics. There are a few questions that have been bugging me that I'm hoping all you smart people here can answer: 1) What's the difference between a linear transformation and a tensor? Somehow they can both be represented by a 3x3 matrix, but they do different things when acting on a vector? Like the columns of a 3x3 matrix of a linear transformation tell you where the basis vectors end up, but the same columns of a tensor don't represent basis vectors at all? 2) Furthermore, a linear transformation transforms all of space but a tensor is defined at every point in space? Does a tensor act on vectors the same way as linear transformations do? 3) What the heck is the difference between a tensor product, dyadic product, and outer product and why are engineering tensors like the Cauchy stress built from the tensor product of two vectors (i.e. traction vector and basis vectors). 4) Is it true that scalars and vectors are just 0th order and 1st order tensors, respectively? How are all these things related to each other? I have plenty more questions, but I figure the answers to these could already be enough to fill a whole textbook. Just to note, I have already searched reddit for tensors but have't found any explanations that make any sense to me yet. Thanks! [link] [comments]  |
| What causes certain eyes to become red in camera pictures ? Posted: 01 Jun 2017 08:35 PM PDT Why do some eyes produce the "red eye" effect? What's the physical mechanism in the cameras that creates this? [link] [comments]  |
| What is the origin of all the different races we see of people in the world? Posted: 01 Jun 2017 11:13 PM PDT This question came about when I was pondering Pangea, and wondering if, if the world were still a single continent with no natural borders (ie, the ocean), would there still be different races of people? Different languages? [link] [comments]  |
| How do astronauts live a normal life in space? Posted: 01 Jun 2017 11:07 PM PDT Doing normal activities such as eating, exercising, going to the bathroom, showering, even washing clothes? [link] [comments]  |
| What release more radiation, Fukishima and Chernobyl Vs every coal power plant ever? Posted: 01 Jun 2017 05:54 PM PDT This was prompted by something someone said at https://news.ycombinator.com/item?id=14462533 "I'm sure Chernobyl and Fukushima have released more radioactivity than every coal fired plant that has ever been or ever will be." Curious if that is likely to be true or not. [link] [comments]  |
| Does temperature have relativistic effects? Posted: 01 Jun 2017 08:58 PM PDT If movement of an object can slow it's clock relative to an observer, is it possible to heat an object to the point that the molecular motion associated with the energy increase would have noticible relativistic effects? i.e. slowed clock or increased mass [link] [comments]  |
| Why is light reflected from the road polarized? Posted: 01 Jun 2017 11:23 PM PDT If the road is seen as a flat surface, shouldn't all light be reflected, and not only some preferred direction of polarization? And yes I though about this in relation to sunglasses. [link] [comments]  |
| What is Lie theory and its application in string theory/gravitational theories? Posted: 02 Jun 2017 01:11 AM PDT |
| Posted: 02 Jun 2017 04:28 AM PDT |
| Posted: 01 Jun 2017 10:13 PM PDT |
| How much energy total is radiated by all the stars and galaxies in the universe at any given moment? Posted: 01 Jun 2017 11:21 PM PDT I ask because this Atlantic article (https://www.theatlantic.com/science/archive/2017/06/gravitational-waves-black-holes/528807/?utm_source=atlfb) states "[t]he collision of two black holes releases more energy than all the stars and galaxies in the universe radiate at any time." This seems like a stretch to me. The collision they reference released the energy of three solar masses, mass-energy equivalence predicts 5.36E47 joules. I realize this is an almost unimaginable number, but has the finitude of the universe even been established? What's the current thinking about this? Secondly, the article quotes a few astronomers expressing surprise that they found so many large black holes, ranging from 20-60 solar masses. Are the supermassive black holes thought to be in the center of galaxies, ranging in the thousands to billions of solar masses, just in another category altogether? I don't get the surprise. [link] [comments]  |
| What causes plastic to appear to be moving when viewed through an infrared camera? Posted: 01 Jun 2017 10:40 PM PDT When looking through my indoor infrared security camera, a piece of hard black plastic (part of a stereo) appears to be moving/growing. Little organic rounded blobs come out and then back in to the plastic. What causes this phenomenon? [link] [comments]  |
| Posted: 01 Jun 2017 09:53 PM PDT TLDR: Generally curious about what is happening when people appear to be dead and randomly start breathing again(I focus on drowning as an obvious example but interested in other causes of death as well).
[link] [comments]  |
| What is the 'evil eye' and how many cultures is this present in? Posted: 01 Jun 2017 09:24 PM PDT I've heard of the 'evil eye' in Greek, Italian, Indian, and Roma culture, I'm wondering if this concept is present in other cultures as well. And what exactly is it? [link] [comments]  |
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