What is Explain: Definition and 1000 Discussions

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. R

    How does this C programme work with recursive functions?

    explain this C programme?? #include<stdio.h> void func (int x); void func(int x) { if (x>0) func(x-1); printf("%d",x); } int main() { func(4); return 0; } this C programme gives the output of 0 1 2 3 4 can anyone explain me how this happens I am totally confused ...
  2. sinaphysics

    Quantum maths and explain their from basic

    hi, i want a book that introduce the heading of quantum maths and explain their from basic to advanced. if this book there is in internet free, please send it's link.
  3. W

    Explaining Q3 After TED Link: 65 Characters

    After the link to TED was posted a few threads below, I began to browse through the videos and I found this one which I liked a lot. http://www.youtube.com/watch?v=5hJCxSiH4ts&feature=channel_page I got questions 1 and 2 right. But the 3rd and 4th questions wrong and along the lines of the...
  4. C

    Did Einstein Explain Speed of Light's Constancy?

    Did Einstein ever say how he came up with the fact that the speed of light is always constant .
  5. C

    Question about weight/mass/force I can´t explain

    Hi everyone ! I´m posting as I couldn´t find any information on the forum, or maybe I can´t find a way of searching. My question is based on a discussion me and my girlfriend had about "making yourself heavier", and we tried a little experiment: First I lifted her in my arms without any...
  6. H

    Can someone explain angular power spectrum

    Hi I'm trying to get my head around this plot of the cosmic microwave background radiation. http://www.astro.ucla.edu/~wright/CMB-LCDM-w-WMAP.gif I've been searching all around to find out what exactly a angular power spectrum is. I know what an ordinary power spectrum is. I'm a second...
  7. N

    Can anyone explain the need for elipses?

    I was wondering, why is it that the planets orbit in elipses? I find it strange that it's path would be eliptical, is it the result of some kind of force of nature keeping it fixed in it's orbit? Or is that simply the way it is? I can't help but feel there's something deeper to it...
  8. L

    Can someone explain the inclined plane picture to me?

    Hello everyone, Right now I'm working on an inclined plane problem. "a) The worker exerts a force(F) of 86 N. How much work does he do? (b) How much work is done by gravity? (Be careful with the signs you use.) (c) The coefficient of friction is µ = 0.20. How much work is done by...
  9. D

    Can someone please explain leibniz rule to me,

    according to leibniz, if i have a series (An) with an alternating sign, in order for the series to converge, i need either |An| to converge, or |An| to diverge and An=0(for n->infinity) and A(n)>A(n+1) BUT in the following series where An= ((-1)^(n-1))*1/(n+100sin(n)) the series |An|...
  10. D

    How Is Electrical Permittivity Defined Mathematically Without Using Curls?

    Electrical permittivity...in mathematical terms, i.e I need the derivation...WITHOUT using 'curls'. Didn't find it online.
  11. D

    What does 'dx' mean and how does it relate to calculus and physics?

    Hey guys. I've started studying Physics at home, but only the theory side with a little mathematics. So i would like to try, if i can, to introduce a little calculus to my work. But the problem is i find calculus a mind boggle, i understand All the GCSE math that i did. Could someone explain to...
  12. M

    Can someone explain modulo with fractions?

    so apparently 3^-1 mod 5 = 2 so (1/3) mod 5 = 2 I don't get how this works, can someone explain?
  13. T

    Explain Force & Acceleration for Tension in Rope Around Cylinder Drum

    Homework Statement A 55kg mass is tied to a massless rope wrapped around a solid cylindrical drum. The drum is mounted on a frictionless horizontal axle. When the mass is released, it falls with acceleration 1.0m/s^2 . Find the tension in the rope. my answer : 484N the way I got is...
  14. D

    How does Many Worlds theory explain Schroedinger's cat

    As I understand it, when Schroedinger's "box" is opened, then a dead cat comes into existence in one universe and a live cat in another. However, in a variation to this experiment, in which there is say a 10% chance of the cat living and 90% dying, when the box is opened does one live cat come...
  15. E

    Someone please explain this physics concept

    My teacher had a long metal pole (I believe it was aluminum) and said that it was NOT magnetized. He put a magnet up to the side of the pole and it did not stick, and he dropped a marker through the top of the pole and the marker came out the bottom at a normal rate. However, when he took a...
  16. T

    Does Einstein really explain everything about gravity? Is there more?

    Although Albert Einstein had explained the new picture of gravity through his theory of general relativity, by explaining that gravity is the warping of spacetime, did he explain why mass actually warps this fabric of spacetime?
  17. U

    Can anyone explain this self healing mystery.

    Can anyone explain this "self healing" mystery. Can anyone think of any type of failure mode in an electronic component that could account for the following weird case of my self healing LCD monitor. ---------------------------------------- I've got this LCD monitor that's got a weird...
  18. J

    What does Dark Energy explain?

    It appears that the Dark Energy concept was born out of a need to explain the two major observational phenomenons (increasing rate of expansion of the Universe and the faster-than-expectated-rotation of the galactic outer-rim). If I'm not mistaken, this also has to do with gravity seemingly...
  19. A

    Could someone please explain this 4-vector/tensor notation?

    If you can answer any of the questions below, your help will be greatly appreciated. There's an equation from E&M (I believe the definition of the antisymmetric field tensor) that reads: F_{\mu \nu} = \frac{\partial A_\nu}{\partial x^\mu} - \frac{\partial A_\mu}{\partial x^\nu}...
  20. W

    I feel really lost in my PDE class. Can somebody explain some things to me?

    I'm not going to blame anyone except for the fact that I'm probably a slow learner. Can somebody explain some of the things I'm learning in layman terms? That way I can have some context when I'm reading about them. Right now, the things I'm reading have no meaning, so it's really hard to...
  21. D

    Can someone explain curved space time?

    I have become very interested in physics and astronomy recently and have started dabbling. I have been reading about curved space time and its association with gravity. I've also been reading about time as it is related to travel at the speed of light. Can anyone explain the concept of...
  22. A

    Could someone please explain this (simple) fact about Taylor expansions?

    My professor just told me that if \Delta x is small, then we can expand L(x+\Delta x) as follows: L(x + \Delta x) = L(x) + \frac{d L}{d x} \Delta x + \frac{1}{2!} \frac{d^2 L}{d x^2} (\Delta x)^2 + \ldots, where each of the derivatives above is evaluated at x. Could someone please...
  23. A

    Could someone explain how to evaluate this horrible integral?

    The integral is \int_0^{f(E)} \frac{\cosh \alpha x}{\sqrt{1-\beta \cosh^2 \alpha x}} dx, where f(E) = \frac{1}{\alpha}\cosh^{-1}(\sqrt{\frac{1}{\beta}}), \alpha > 0, and 0<\beta<1. The integral has proven very difficult to evaluate. Every time I plug it into Mathematica with values for...
  24. G

    Explain the difference between these square roots

    Hey guys, I was just wondering what the difference between these two statements are: V¯(x) = ± 4 V¯(x) = - 4 ---> does not exist. This is the quote from my text, "...we remind you of a very important agreement in mathematics. The square root sign V¯ always means take the positive...
  25. A

    Can someone please explain this remark in Landau-Lifshitz's *Mechanics*?

    Can someone please explain this remark in Landau-Lifshitz's *Mechanics* about fields? On pg. 15, it says that "individual components [of momentum] may be conserved even in the presence of an external field." What do they mean, exactly, by "external field?" I know (or at least I think I...
  26. L

    Can someone explain (Differential Forms)

    (i) if \alpha=\sum_i \alpha_i(x) dx_i \in \Omega^1, \beta=\sum_j \beta_j(x) dx_j then\alpha \wedge \beta = \sum_{i,j} \alpha_i(x) \beta_j(x) dx_i \wdge dx_j \in \Omega^2 NOW THE STEP I DON'T FOLLOW - he jumps to this in the lecture notes: \alpha \wedge \beta = \sum_{i<j} (\alpha_i...
  27. H

    Peculiar feature of a commutator, can anyone explain?

    http://img209.imageshack.us/img209/4922/14662031eo8.jpg
  28. H

    Peculiar feature of a commutator, can anyone explain?

    http://img209.imageshack.us/img209/4922/14662031eo8.jpg
  29. A

    Please explain binding energy?

    Can some kind person please explain why He-4 is so high and Li-6 is so low on the graph of binding energy per nucleon. Copy of the graph here http://en.wikipedia.org/wiki/File:Binding_energy_curve_-_common_isotopes.svg" It means that He-4 must be very stable right? Because binding energy is...
  30. C

    Can someone explain Charpit's Method to me (PDEs)

    Can someone explain Charpit's Method to me (PDEs) ! Thanks
  31. N

    Please Explain when an RC Circuit Opens - Effect on a Light bulb

    Homework Statement Initially the switch is closed in the circuit shown and the light bulb is shining brightly. What happens when the switch is opened? (diagram in attached link) 1. The bulb goes out immediately. 2. The bulb gets gradually brighter. 3. The bulb gets gradually dimmer...
  32. H

    Explain an Orbit: Simple Definition & Example

    I'm trying to study a proof for a quiz right now, and even though I have the answer, I don't get it because I don't understand what an orbit is. I got no definition in class, and can't find anything in the book. I looked on wikipedia, but that was completely over my head. Can someone please...
  33. J

    Please explain this Formalism in Linear Reponse Theory.

    I am learning linear response theory right now and I have come across a mathematical technique I have seen before but I don't understand the reason for the application. What I am talking about is the insertion of the sum of basis vectors in the commutator. Generally speaking it looks similar to...
  34. L

    Why planck scale? let me explain before kill me

    Why we are searching quantum gravity effect at the Planck scale? The question seems very stupid (and may be) but let me explain. I define a quantum object when his action is of the order of Planck constant \bar h. namely A~E \delta t~\bar h. So if i take a small amount of energy E i can take...
  35. S

    Special Relativity, please explain the meaning of this problem

    Homework Statement The reference frame K' moves in the positive direction of the x-axis of the frame K with a relative velocity V. Suppose that at the moment when the origins of coordinates O and O' coincide, the clock readings at these points are equal to zero in both frames. Find the...
  36. F

    Mechanics & physics,can anyone explain the scenarios?Very practical Questions?

    Mechanics & physics,can anyone please explain the scenarios?Very practical Questions? Hi...Can anyone please be kind enough to help me? i know it will take a bit longer for u to answer. I have some scenarios and questions in the following pages...
  37. J

    Please explain what this bra-ket expression means

    I am reading a paper that uses a quantum mechanical notation that I do not understand. I have found a webpage that explains it, but I do not understand the explanation either: http://chsfpc5.chem.ncsu.edu/~franzen/CH ... (let Y represent the Psi) Specifically, I understand what <Yn|A|Yn>...
  38. L

    Can anyone explain the solution of the Monty Hall problem? (probability)

    The problem comes down to this: At a gameshow there are three doors. Behind two of them there is a goat, and behind one is a car. You pick a door. The gameshow host, who knows where the car is, then opens one door that you didn't pick, but contains a goat. You are then allowed to change your...
  39. L

    Can anyone explain the physical meaning of spin in QM?

    Can anyone explain the physical meaning of "spin" in QM? I'm a physics master student and I've completed several quantum mechanics (or related) courses and i have no problem working with Pauli spin matrices, angular momentum L, spin momentum S and total momentum J for nuclear or atomic...
  40. russ_watters

    Will Smith "Voted" Top Moneymaking Movie Star 2008: Does it Make Sense?

    Can you explain to me... How Will Smith was "voted" (?) the top moneymaking movie star in 2008 by theater owners? http://www.usatoday.com/life/movies/news/2009-01-02-smith-top-moneymaker_N.htm He had two movies out, Hancock and Seven Pounds, which together grossed $267 million. But The Dark...
  41. F

    Can Quantum Gravity Explain Inflation After the Big Bang?

    I wonder if quantum gravity effects can explain Inflation after the Big Bang? For example, in Loop Quantum Gravity, there are area and volume operators and eigenvalues, etc. Would there be jumps from one volume state to another with time? Thanks.
  42. N

    Please, will you explain the nature of spectral lines

    Hi, I was wondering what really ARE spectral lines? Are they electromagnetic waves? But still they are affected by magnetic & electric field in the Zeeman and Starks effect respectively, whereas the electromagnetic waves are not. so is there any theory explaining...
  43. C

    Medical Anyone care to explain muscle development?

    In an attempt to grow stronger (i'm quite feeble to be honest) I've decided to start doing dumbbell excercises. However, I'm quite curious - what actually causes muscle development? As in the process, what occurs in the body for it to occur, etc. Thanks in advance.
  44. C

    Can someone explain equivalence of gravity and inertia?

    I've been trying to put this together in my head for a while and it doesn't come out. For example, if there are more stars on one half of the sky, does it mean that a thrown object will travel faster in that direction? If the object is at the edge of the universe, does it mean it will not be...
  45. S

    Can any one explain me about the bigbang singularity

    can anyone explain me about the bigbang singularity
  46. C

    Wind turbine motion equations - explain

    was changed to a new thread... https://www.physicsforums.com/showthread.php?t=277401 thanks
  47. D

    I still need someone smart to explain 2 me momentum and Impulse throughly .

    I still need someone smart to explain 2 me momentum and Impulse throughly... 1. A hunter has rifle that can fire a.05 kg bullets with a speed of 900 m/s. A 40 kg leapord springs at him at 10 mm/s. How many bullets would the hunter need to stop the tiger dead in its tracks...
  48. P

    Explain differential equation of order 3?

    Explain differential equation of order 3? With example?
  49. L

    Explain how to compute this integral?

    Can someone please explain how to compute this integral? This is not for school; I just came across it and I'm not sure what to do. Parts and various identities didn't help. \int x/tan(x) dx
  50. B

    Density. Please explain this solution

    Homework Statement A sphere completely submerged in water is tethered to the bottom with a string. The tension in the string is one-third the weight of the sphere. What is the density of the sphere Homework Equations Here is the solution to this problem. It is problem 15.17, the...
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