Explanation Definition and 982 Threads

An explanation is a set of statements usually constructed to describe a set of facts which clarifies the causes, context, and consequences of those facts. This description may establish rules or laws, and may clarify the existing rules or laws in relation to any objects, or phenomena examined.Explanation, in philosophy, is a set of statements that makes intelligible the existence or occurrence of an object, event, or state of affairs. Among the most common forms of explanation are causal explanation; deductive-nomological explanation, which involves subsuming the explanandum under a generalization from which it may be derived in a deductive argument (e.g., “All gases expand when heated; this gas was heated; therefore, this gas expanded”); and statistical explanation, which involves subsuming the explanandum under a generalization that gives it inductive support (e.g., “Most people who use tobacco contract cancer; this person used tobacco; therefore, this person contracted cancer”). Explanations of human behaviour typically appeal to the subject’s beliefs and desires, as well as other facts about him, and proceed on the assumption that the behaviour in question is rational (at least to a minimum degree). Thus an explanation of why the subject removed his coat might cite the fact that the subject felt hot, that the subject desired to feel cooler, and that the subject believed that he would feel cooler if he took off his coat.

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  1. B

    Explanation of the 'chain fountain': some doubts

    Apologies if this has been discussed in other threads already. I did a quick search on 'chain fountain' and got no hits. If you coil a length of chain into a container and let it slip out over the lip under its own weight, it will start to form an arc through the air, without touching the lip...
  2. D

    PHYSICAL explanation of light reflection by metals

    Electric field of an electromagnetic wave incident on a metal accelerates free electrons, and these accelerating electrons then emit radiation opposite to the electric field of the wave, thus reducing the resultant amplitude in the forward direction. Radiation emitted in the backward direction...
  3. P

    PWM Inverter Drive explanation please

    Hi, I understand that the PWM inverter drive system first uses a diode bridge rectifier in order to convert the AC incoming into DC before using an inverter to convert this DC into PWM for use on the induction motor. Could someone please explain in simple terms how the PWM inverter section...
  4. B

    Incomplete integration explanation

    hello, i have a question about an explanation of integration as finding the area under a curve. I don't have any problems doing the integration but it's more a case of why? Finding the area bound by two curves is easy enough but what does that area actually mean? I know that it's a...
  5. L

    Qualitative explanation of radiative transitions and selection rules.

    Hi, I'm looking get a deeper conceptual grip on A&M spectroscopy, particularly what actually goes on between atoms/molecules and photons during an emission/absorption event. In general I just want to understand the "why's and how's" of the selection rules for dipole/quadrupole transitions, but...
  6. R

    How Does a Transistor Work?

    Hey guys, So I built a circuit a little while back using a flyback transformer and a 2n3055 transistor. Basically it just gave me a massive hi voltage output an I saw little inch long plasma arcs. If you guys need a circuit diagram, I can send you the link or just post it here. The main point...
  7. M

    Spectrochemical series explanation

    After learning about crystal field theory, my main question was due to the arrangement of the molecules in the spectrochemical series. I can understand that the larger anions are placed towards the lower end since they do not cause high splitting in the d orbitals, but some of the arrangements...
  8. O

    Why is Energy a Scalar? A Simple Explanation

    I am having trouble understanding why energy is a scalar. (1/2 mv^2, mgh, 1/2kx^2, etc). Can someone just briefly hit over why? I tried asking a few people but I still don't get it. Thanks.
  9. L

    Explanation of an angular momentum term

    Hello, could somebody please explain to me why in 4 of these solutions, the angular momentum final term about point p is mVfR + Icmω ? It is in huge attached solutions my teacher posted. Thank you very much in advance Here is the problem in case you are interested of Horne context. 4. A...
  10. stevendaryl

    Elementary Explanation of Unruh Effect

    The Unruh effect is the fact that an accelerated observer doesn't see vacuum, but a thermal bath of particles with an effective temperature proportional the proper acceleration. The explanations that I've seen for this effect seem very mysterious to me. It seems to involve the fact that the...
  11. I

    MS Windows workflow: an explanation

    I have been pretty much interested in Microsoft Windows Workflow lately and trying to figure out how to explain to my 13 year old nephew its concepts and simple applications. I run into this article, informative and quite useful but not really simple at all (maybe because of my bad English)...
  12. A.T.

    Explanation of EM-fields using SR

    What do you think about this explanation of EM-fields using SR? https://www.youtube.com/watch?v=1TKSfAkWWN0
  13. T

    Evolutionary explanation for altruism to unrelated persons?

    What is the evolutionary explanation for altruism to unrelated persons when social recognition is not expected? .... Suppose, it's a cold night. I was walking by a street. There is nobody else around, except a poor physically disabled kid shivering in cold on the pavement. I thought it would...
  14. S

    Schwarzschild Radius Explanation?

    Hello, First off, I'm not a physics student by any means, but it does intrigue me. I've been wondering about the Schwarzschild radius, and how the density of an object dictates the escape speed. Why is it, that the more you compress an object, the more gravity it "owns?" If you were able to...
  15. morrobay

    Is Superposition the Explanation for Bell Inequality Violations ?

    This form of a Bell inequality: n[x-y+] + n[y-z-] ≥ n[x+z+] is derived from spin measurements at A and B when detector settings are aligned. If it is correct that when a particle is measured at detector A and is spin up in the y direction , then its entangled twin at B is in superposition...
  16. marcus

    1000 TeV neutrinos - dark matter decay proposed as explanation

    The IceCube detector in the deep ice at the south pole has seen two instances of 1015 eV neutrinos. These are said to be the highest energy neutrinos so far seen. http://resonaances.blogspot.com/2013/09/storm-in-ice-cube.html What process could have launched such high energy neutrinos? It has...
  17. J

    Which Compound Has the Highest Boiling Point and Why?

    Homework Statement Arrange compunds in order of increasing boiling points and explain why. C2Br6,C2F6,C2I6,C2Cl6 Homework Equations The Attempt at a Solution I have C2Cl6 < C2Br6 < C2I6 < C2F6 My explanation is as follows. C2F6 is highest because it has dipole dipole forces...
  18. M

    Explanation of Rayleighs work on vibrations of liquid droplets

    Hi, I'm trying to calculate the vibrational energy of a water droplet for a given vibrational amplitude. Rayleigh wrote about this in Proc. R. Soc. Lond., volume 29, 1879, "On the Capillary Phenomena of Jets", Appendix II, but he makes some simplifications (as I understand it) and I also...
  19. S

    Explanation of expanding universe

    I once asked a physicist to explain what the universe expands into, and he gave me the analogy of raisins in bread dough. That the raisins represents galaxies, galactic clusters, etc...and as the universe (bread dough) expands, the galaxies (raisins) move apart. But this analogy assumes that the...
  20. B

    Fluid mechanics problem, need explanation please

    Hi please check the highlighted question in the attachment and the solution and see the problem, i need help please. I have two questions about it: 1- why didn't we take the plug as a vertical wall and thus the force would be integral of pressure x area? 2-WHERE DID THE FORCE DUE TO...
  21. F

    Objects in house moved-need some logical explanation

    Objects in house moved--need some logical explanation I currently reside in a 2 story single family home. https://docs.google.com/file/d/0BwZN-VaEpzfwaEE4ZXRpRnV3cVE/edit?usp=sharing. This past friday afternoon I noticed that two of my patio pillows (that looks like this) has moved from the...
  22. S

    Explanation on how to arrive at equation for EM wave?

    It is known that the electric field component of the EM wave is given by E=E_{0}cos(kx-\omega t) How do I arrive at such a form? It is quite different from the standard sinusoidal equation of y=Acos(\omega t+\varphi) Any guidance? What does the kx-\omega t describe physically?
  23. N

    Very strange accidental proximity sensor - Explanation wanted

    Hello everybody, I was working on an electronics project, and one of the LEDs (actually I'm using only one) started acting really strange! It will light up when I come close to it, ONLY if I have been out of the room for some time! And that's not all, the period for which it will light...
  24. X

    Unraveling the Explanation of A \bigcup B, A \bigcap B, and A X B

    I don't understand it. A has n elements, and B has m elements. Give the exact maximum/minimum of 1) A \bigcup B 2) A \bigcap B 3) A X BI don't understand the solution to this.. 1) If A and B are a disjunction ( A\bigcap B = ∅), then the max of A \bigcup B is: A \bigcap B = ∅ ->...
  25. C

    Explaining Why a Set with Operation * Does Not Define a Group

    Hi, I'm having trouble understanding why the follow composition table for the set \left\{ a, b, c, d \right\} with operation * doesn't define a group. \begin{array}{c|cccc} * & a & b & c & d \\ \hline a & c & d & a & b \\ b & d & c & b & a \\ c & a & b & c & d \\ d & b & a &...
  26. Q

    Pair Production: Clarification and Explanation

    hi, i just need a quick clarification on pair production. from my limited understanding, a photon of sufficiently high energy (gramma ray with energy at least equal to the mass of both an electron and positron at rest) will interact with a nucleus in ways that i do not understand to...
  27. A

    Proper ethic to ask for explanation for grade?

    I just got back a grade for an independent study I did this past spring. I really wasn't expecting this grade (B+) since people get away with A's in reading independent study/independent reasearch/reading courses by doing a lot less work than I had done. I can think of a couple of places where I...
  28. TheDemx27

    Multiverse Evidence Explanation?

    My friend keeps on harping on this sort of stuff. He says that there is a gravitational pull from other universes affecting the matter in this universe and creating imperfections in the cosmic background radiation. I find it hard to believe that any sort of boson would be able cross the...
  29. G

    Explanation of exponential operator proof

    Can someone please explain the below proof in more detail? The part in particular which is confusing me is Thanks in advance!
  30. U

    Explanation of the discrete fourier transform

    Hi all, I'm a complete novice when it comes to describing images in frequency space and i understand that it is a way of representing images as being composed of a series of sinusoids. So a horizontal striped pattern with a single spatial frequency would have a magnitude image in frequency...
  31. L

    Undergraduate-level explanation of Dirac Equation?

    I am interested in learning about how the Dirac Equation was derived, how it allowed special relativity and QM to be unified, and how it predicted the existence of animatter. The explanations I have found so far are too advanced for me mathematically, and I was wondering if anybody could...
  32. A

    Is there a physical explanation for why we can't see certain colors?

    Why can't low frequency or high frequency light enter my eye just like ordinary light? I imagine an ordinary camera should be able to detect light if it enters the lens, no matter the frequency. Am I under a misapprehension about cameras? Why can't the eye do the same? I know this is a physics...
  33. E

    The most simple explanation for origination of spiral galaxies?

    We know that there exists no such thing as a "rigid" substance in relativity. Now suppose we had a disc of uniform density the size of the Milky Way. When the "core" of the galaxy starts to rotate, the effects (tidal and gravitational) of this rotation propagate at the speed of light, which is...
  34. fluidistic

    Free expansion of a Van der Waals gas, physical explanation

    Hello! Today I've learned that when a Van der Waals gas undergoes a free expansion, it cools down a bit. :bugeye: This is in contrast with the ideal gas in which case since it does no work and since the process is adiabatic, the internal energy of the ideal gas remains unchanged by the...
  35. N

    Intuitive, real-world explanation of displacement current?

    I know and fully understand the mathematical definition of it. But what's the physical explanation? Is it something like "preservation of current" or something?
  36. D

    Rudin's explanation of how rapid the series 1/(n) converges

    In Rudin's Principle's of Mathematical Analysis, Rudin days that we can estimate how fast the series \sum\frac{1}{n!} converges by the following: Put $$ s_{n}=\sum_{k=0}^{n}\frac{1}{k!}. $$ Then $$ e-s_{n}...
  37. H

    Quantum physics explanation problem

    i have a friend and i am trying to explain to him that until it interacts with something it is evrywhere and no where but has more of a probability in being in place a than place b or c but until it interacts we don't know so there for it is evrywhere. that is the concept as i understand it. he...
  38. B

    Parametric Equation Trochoid Explanation

    The third line is the type of problem I have: Derive the parametric equation for a circle with a distance 'b' from the circle with a radius 'r'. So from the edge of the circle to the red dot is a distance 'b' but from the center to the edge of the circle is 'r' I know the parametric...
  39. X

    Explanation of some nuclear terms.

    Hi everyone, I was reading the report about the Fukushima incident and I do not understand some concepts because of my limited understanding. Could you please help me? Combustible Gas Control. <----- can you explain this concept in simpler language The NRC regulations in 10 CFR 50.44...
  40. G

    Physics explanation of a chair trick?

    Today my English teacher told us that we you can't lift a four-legged chair (of avg weight) if you only lift from the bottom of one leg. All the students tried and none of us could. What is the physical explanation of this? I'm guessing it has a lot to do with the moment of inertia of the chair...
  41. M

    Spectra: line mixing explanation?

    Hi Can anyone point me to a clear description of line mixing/"cross-relaxation" in atomic/molecular spectra? Every paper I read assumes some previous knowledge, is there an online resource that will explain why two transition would mix? I'm specifically looking for conceptual explanation...
  42. B

    Is the GR explanation for how gravity moves things?

    Is this a simple GR explanation for how gravity moves things? In SR, the dilation effects happen in a way such that the speed of light is maintained for all observers. In GR, mass is considered denser regions of spacetime. What I was thinking: It takes longer for light to precipitate...
  43. O

    Explanation on Shunt resistor from meter

    I know meter shunts are used to direct most of the current away from the meter coil but my question is if you direct most of current away from the coil, how is the meter measuring the current flow accurately. Im kinda slow in the head so no complex fried banana explanation. tnx
  44. D

    Why Is the Second Step in the Partial Derivative Explanation Confusing?

    Hello, Could anyone please explain me the steps in these pictures. I do not understand the second step. http://imgur.com/AvVbPu5,Ust2Zpx#0 Second one: Third step ( i don't understand) http://imgur.com/AvVbPu5,Ust2Zpx#1 If anyone can give me detail explanation, i would really appreciate it.
  45. P

    Δp for total reflection and absorbtion of E&M radiation explanation?

    The equation for the change in momentum for total absorption of electromagnetic radiation is ΔU/c and that for total reflection is (2ΔU)/c. How could the momentum of electromagnetic radiation change if it is massless and travels at a constant speed c? Is the ΔU just a representation of a change...
  46. Roodles01

    Polarised (polarized) light; EM explanation.

    Facets of a rock specimen sparkle brightly In terms of electromagnetism how can I show that a linearly polarised light source can be used to determine that the facets are dielectric rather than metallic? Should have to do with scattering, but not sure whether it could be explained with a...
  47. E

    De-Broglie's explanation on Bohr's Angluar Momentum quantization?

    In order to understand about De-Broglie's explanation on Bohr's second postulate,concept of standing waves should be understood. But condition of λ for a given value of length(string) L is given by L=nλ/s where n =1,2,3 etc. But for a string whose ends are connected together and its shape is...
  48. S

    Kinetic Energy Formula definition explanation

    Homework Statement I'm trying to understand how this equation was came together, mainly, I hardly understand why velocity is squared, and why there's the constant of '1/2'. Homework Equations In classical mechanics, the kinetic energy of a point object (an object so small that its mass...
  49. S

    Do you agree with my explanation of time dilation

    The increased contraction and shortening of space is causing dilation in the passing of time. In other words, increased relative velocity spreads two points in time further from each other. Please tell me I understand this correctly! I hope the Great Peter Donis will weigh in.
  50. G

    Did MMX's Assumptions on Light and Sound Waves Affect Their Findings?

    I am wondering whether MMX was based on faulty assumptions that light waves would behave like sound waves. 1) What if MMX detected a phase shift? It would just mean that speed of light is c and it goes through different distance, with or without Ether justifying the shift. 2) Alternatively they...
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