Happy Pi Day everyone! |
- Happy Pi Day everyone!
- If got one atom to absolute zero, and I touched it, would it kill me? If not, how much matter at absolute zero would I need to touch?
- A fair coin flip conveys 1 bit of information. Is there a simple physical system that conveys 1 nat of information?
- If water is shaken violently enough and for a long period of time, will its molecular structure begin to break down?
- Does the brain increase in temperature when thinking more?
- Does the existence of the Casimir effect prove that an Alcubierre Drive is possible?
- When an atom's nucleus changes (e.g. due to radioactive decay) what happens to its electrons?
- Hows a perfect emitter a perfect absorber as well ?
- Intuition behind naming of EM vector quantities. Difference between flux density and field intensity?
- If canned food can still be edible 2 or 3 years after canning, then why not 20 or 30 years or longer? How do manufacturers set expiration dates for long-life goods?
- Is there a way to measure how much UV radiation it takes to cause a photochromatic chemical to change color?
- Do buildings, such as stadiums, have to be designed to account for vibrations from fans and music?
- Could a pipe made from any rock or clay be harmful to smoke?
- What are projection of vectors exactly?
- What is the probability distribution of the number of kids my wife would have to give birth to so we have at least one son and at least one daughter?
- If I amplitude modulate a 10k Hz audio signal at 15 Hz, what frequency would my mind perceive?
- Is it possible to construct every possible continuous curve using the standard arithmetic operations and calculus?
- Are fears hereditary?
- If neurons can't reproduce, does that mean adult humans have the same amount of neurons as newborn infants?
- Do bees hibernate or migrate for the winter? And how do they keep track of seasons?
- Would this matter to energy converter work in principle?
- When food goes 'stale' why do soft foods (bread) turn hard while soft food (crackers/biscuits) turn soft?
- Could finding the solution to the cause of hypercapnic ventilatory response (HCVR) bring us closer to solving SUIDS, COPD, and Sleep Apnea?
| Posted: 14 Mar 2016 05:59 AM PDT Today is 3/14/16, a bit of a rounded-up Pi Day! Grab a slice of your favorite Pi Day dessert and come celebrate with us. Our experts are here to answer your questions all about pi. Last year, we had an awesome pi day thread. Check out the comments below for more and to ask follow-up questions! From all of us at /r/AskScience, have a very happy Pi Day! [link] [comments]  |
| Posted: 13 Mar 2016 11:30 AM PDT |
| Posted: 13 Mar 2016 08:53 AM PDT A nat is the basic unit of information when natural logarithms are used. A bit is the base when using log base 2. Edit: Thanks all for your input so far. /u/brightpixels pointed out the close correspondence between this problem and a sequence of bernoulli trials, and gave a construction capable of producing exactly 1 nat of surprise in the limit of an infinite number of random trials. /u/gibbigg provided a similar construction. /u/AugustusFink-nottle suggested observing a Poisson process over a specified interval. These solutions have exactly the right flavor, i.e., relatively simple physical processes or systems that don't require building 1/e into the solution as an arbitrary numerical constant. Neither are as simple as flipping a single fair coin, but I'm willing to accept that may be a fundamental limitation since the nat is built on a transcendental constant (as pointed out by /u/7335799168). Several others insist that an appropriately biased coin satisfies the requirements. I agree in principle, but nobody has been able to give a simple physical construction for arriving at this. As an analogy, there are many physical constructions for the numerical value of pi. However, taking a stick and gradually sanding it down until its length is 3.14159... does not qualify as a solution. I'm not really interested in arguing the point any more than I have, so if you don't see why this isn't an adequate solution I apologize for not making it clearer. [link] [comments]  |
| Posted: 13 Mar 2016 08:10 AM PDT I am not sciencey in the least, so I have no idea if that's even a stupid question. I apologize if it is. I was just wondering if that would be possible? And if it does, would it separate into hydrogen and oxygen? Is this nonsense? [link] [comments]  |
| Does the brain increase in temperature when thinking more? Posted: 13 Mar 2016 07:52 PM PDT I understand that the brain cools itself down through the ears and head, but what if it didn't have this cooling system? Would the temperature change at all or does all the energy of thinking just go into thinking itself? [link] [comments]  |
| Does the existence of the Casimir effect prove that an Alcubierre Drive is possible? Posted: 14 Mar 2016 01:09 AM PDT |
| When an atom's nucleus changes (e.g. due to radioactive decay) what happens to its electrons? Posted: 14 Mar 2016 05:32 AM PDT Consider an atom of 3H, for example. Its nucleus contains a single proton & two neutrons, and is orbited by a single electron. When the atom undergoes beta decay, it becomes 3He. The nucleus now contains two protons and one neutron. Is it still orbited by a single electron (making it a positive ion), or does it obtain a second orbiting electron from somewhere? Does the same thing happen when the nucleus changes for a different reason, e.g. nuclear fission or fusion? Does it depend on the state of matter (e.g. solid fission fuel vs a fusion plasma)? [link] [comments]  |
| Hows a perfect emitter a perfect absorber as well ? Posted: 13 Mar 2016 10:24 AM PDT Me and my friend are having a nice argument whether all perfect emitters are perfect absorbers as well but i say only black bodies have this property but he says all of them have this property but he cant explain why PS english aint my main language [link] [comments]  |
| Posted: 13 Mar 2016 03:54 PM PDT I've been learning EM from Cheng (2e) and I'm having trouble understanding the intuition behind the naming of the E, D, B and H fields: E - electric field intensity Why are E and H field intensities and D and B flux densities? I've seen explanations that go along the lines of E and H being differential 1-forms while D and B are differential 2-forms. I don't completely understand the reasoning behind this. What makes E a differential 1-form? Don't calculations involving calculating E-flux inherently treat E as a differential 2-form? In addition, I've always seen D and H as being more closely related (both related to free charge/currents etc). Why is it the case that D's analog is B (and not H)? [link] [comments]  |
| Posted: 14 Mar 2016 12:09 AM PDT So I have a canned drink in front of me that was produced in 2015 and the expiration date is the same month/day in 2017. I know that milk and other foods go off after a certain amount of time and I think that's got to do with the growth of micro-organisms and stuff. It seems like once you get past the first year or so, you should kind of be "out of the woods" with regard to micro-organisms and stuff messing up your food. So how do manufacturers set the expiration date of food and drink that "expires" years after production? Is there a reason why it's 2-3 years and not 20-30 years or indefinite? [link] [comments]  |
| Posted: 13 Mar 2016 06:04 PM PDT |
| Do buildings, such as stadiums, have to be designed to account for vibrations from fans and music? Posted: 13 Mar 2016 11:02 AM PDT I was at a lacrosse game last night that had about 12k people cheering and loud music blaring all the time. The cheap nose bleed seats i had were partly obstructed by very large I-beams so I started thinking about the buildings design, specifically how vibrations are taken into account . Do the vibrations due to music and what not have to be accounted for when designing the building? [link] [comments]  |
| Could a pipe made from any rock or clay be harmful to smoke? Posted: 14 Mar 2016 01:34 AM PDT Ok, it's an odd question, I know. But the thing is, I have been thinking it would be fun to try and make tobacco smoking pipes out of carved rock or burnt clay. However, could there be harmful traces of any metals or other compounds in some rock or clay that releases under the relatively modest heat from burning tobacco? Edit: spelling [link] [comments]  |
| What are projection of vectors exactly? Posted: 13 Mar 2016 02:28 PM PDT What is happening on a 3d plane when I am projecting a vector on another vector? Edit:Rephrashing [link] [comments]  |
| Posted: 13 Mar 2016 02:36 PM PDT Assume we have no kids to begin with and that we keep having kids until the condition is satisfied (i.e., not all of our kids are of the same sex). [link] [comments]  |
| If I amplitude modulate a 10k Hz audio signal at 15 Hz, what frequency would my mind perceive? Posted: 13 Mar 2016 12:08 PM PDT |
| Posted: 13 Mar 2016 04:29 PM PDT If i define some curve by the function f(x), and that function is continuous as well as surjective (i think i'm using that term correctly?) Can that function, in the general sense by defined using only The standard arithmetic operations, as well as derivatives and integrals. If not what is an example of a curve that cannot be? [link] [comments]  |
| Posted: 13 Mar 2016 10:10 AM PDT |
| Posted: 13 Mar 2016 03:03 PM PDT |
| Do bees hibernate or migrate for the winter? And how do they keep track of seasons? Posted: 13 Mar 2016 12:12 PM PDT Additional question, how do I get rid of them? The showed up in my backyard over the last few days. [link] [comments]  |
| Would this matter to energy converter work in principle? Posted: 13 Mar 2016 05:37 PM PDT |
| Posted: 13 Mar 2016 10:40 AM PDT |
| Posted: 13 Mar 2016 10:08 AM PDT Currently I am writing a speech about SUIDS (Sudden Unidentified Infant Death Syndrome) and while trying to understand the syndrome I came across research which suggests the inner ear as a more likely cause of SUIDS. Then fumbling around I found articles listing the same response as a cause for the other aforementioned afflictions. Additional field :Audiology [link] [comments]  |
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