What is Example: Definition and 877 Discussions

The domain names example.com, example.net, example.org, and example.edu are second-level domain names in the Domain Name System of the Internet. They are reserved by the Internet Assigned Numbers Authority (IANA) at the direction of the Internet Engineering Task Force (IETF) as special-use domain names for documentation purposes. The domain names are used widely in books, tutorials, sample network configurations, and generally as examples for the use of domain names. The Internet Corporation for Assigned Names and Numbers (ICANN) operates web sites for these domains with content that reflects their purpose.

View More On Wikipedia.org
Recent contents Top users
  1. J

    Help understanding math on inclined plane example

    I'm trying to follow a very simple example example in a text (Marion/Thornton example 2.1) and I think my rusty calculus is tripping me up and I'm just being stupid. I understand how to derive the acceleration down the plane: \ddot{x}=g\sin\Theta but next they say 'we can find the...
  2. L

    If AB+BC = 24 and AB = 10, THEN 10 + BC = 24 is an example of the ?

    "If AB+BC = 24 and AB = 10, THEN 10 + BC = 24 is an example of the ? Homework Statement "If AB+BC = 24 and AB = 10, THEN 10 + BC = 24 is an example of the ? Homework Equations A) Symmetric property of equality B) Substitution property of equality C) Addition property of equality D)...
  3. D

    Example of transitive but not well ordered set needed

    Example of transitive but not well ordered set needed! My question pertains to the definition of ordinals. According to Thomas Jech's edition of set theory, a set is ordinal if it is both transitive and well ordered by membership. I've been poking around trying to find an example of a set which...
  4. DaTario

    Hydrogen atom as an example of perpetual motion

    Hi All, Thermodynamics forbids perpetual motion based in its second law, but how should one deal with an isolated H atom, seen here as a machine? Is there a concrete perspective of its stopping? In its stationary and fundamental state may one observe dissipation? Thank you DaTario
  5. J

    Relativistic Force Transformations

    I'm trying to visualize the relativity example given in the book. The one with 2 generals signing a treaty at ends of a train (the light in the middle goes on and they both sign when light reaches them). The observers claim that one of the generals signed first. However, the generals claim that...
  6. B

    Question about example 3.9 in griffiths EM

    This is not actually a homework question, just something I am wondering about. A specified charge density dependent on /theta is glued over the surface of a spherical shell and you are asked to find the potential inside and outside the sphere, which is done in the example using separation of...
  7. A

    Confused by an example in Brian Greene's book and SR in general

    Hi there. I've been reading Brian Greene's book "An Elegant Universe" for the sake of curiosity and one of his examples to demonstrate special relativity really confuses me about the entire concept. To start, this is my current understanding of SR, so please correct me if I am wrong: -The...
  8. D

    Calculating Friction Force: A Toy Train Example

    Homework Statement A toy train moves along the track at 9.0m/s. When the power is turned off, the train comes to a stop in 6.0s. The net force on friction acting on the train to stop it is Homework Equations F=ma The Attempt at a Solution how do i find mass and acceleration so...
  9. T

    Is the direct sum of two circles a covering set for the circle?

    I know that the canonical example of a covering set of S^1 is R with the exponential map e^(ix) and that visually, this can be pictured by curling R up in a spiral and letting the "shadow" of the points determine the map. However, I want to know if this is another example: The covering...
  10. D

    Are the eyes an example of the photoelectric effect

    It seems to me that the eyes are an example of the photoelectric effect at work. If so, which is more effective; current technology, photosynthesis, or our eyes?
  11. S

    Can the outer measure be non-countably additive?

    I read that the outer measure is not countably additive, but I can only think of cases where the outer measure is countably additive. Can anybody give me an example where the outer measure is not countably additive? Thanks
  12. N

    How Can Piezoelectric Materials Generate Electricity from Walking?

    Hey I am looking for an example problems that have piezoelectrics generating electricity. I would like to have and use a simple problem in which a piezoelectric is squeezed to generate electricity. Does anyone know where I can find such problems and solutions?
  13. S

    Confusion with the example of Newton’s first law

    Consider a case where 2 people are in a car driving in a straight line at sufficient speed. At some point the driver takes an abrupt 90 degree right turn and owing to reasons attributed to Newton’s first law the co-passenger swerves into the driver (i.e. to the left). My question is why...
  14. CFDFEAGURU

    Functional Example in Gravity: Exploring the Lagrangian and Its Applications

    Hello all, I have been trying to fill in the gaps in the example of a functional given in chapter 3 of Hartle's book "Gravity" and I am not having much luck. I exhausted wikipedia for help to no avail. Does anyone know of or can provide a good simple example of a functional or just the...
  15. H

    Example meaningful function that is product of two other functions

    What could be a real-life example (so no imaginary units and stuff :approve:) where the product of two elimentary functions of one random variable has a meaningful interpretation. Let's say I have a function that maps my random monthy income to number of days I can live off it and another...
  16. T

    Understanding Clopen Sets in X: A Wikipedia Example

    This isn't really a homework question, can someone just explain this bit from wikipedia? consider the space X which consists of the union of the two intervals [0,1] and [2,3]. The topology on X is inherited as the subspace topology from the ordinary topology on the real line R. In X, the set...
  17. A

    Example of dense non surjective operator

    Hi, can anyone give me an example of a bounded operator on a Hilbert space that has dense range but is not surjective? (Preferably on a separable Hilbert space) Im pretty sure such an operator exists since the open mapping theorem requires surjectivity and not just dense range, but its just...
  18. Loren Booda

    LaTeX Could you give an example in Latex?

    I would like an example in Latex of a product with indices n=1 to N for bN, all minus 1, finally equal to bZ. I have not been able to find the original Latex tutorials.
  19. C

    Real World Example for Cosecant or Secant

    I am math teacher and was asked the classic question, "Where am I ever going to use this in life" I usually have a real word example, but for the cosecant function I am stuck (Besides higher level math classes.) Anyone know a specific example?
  20. N

    Is this an example of Relativity?

    So since I've started learning up on SR, the way I look at some things is nothing like it used to be before. The other day I was sitting down looking about, when I went cross eyed for a moment. Then I realized something quite interesting. If you have an object in front of you and you cross...
  21. S

    Solving an example, vectors as rows or columns of a matrix = same solution.

    Ok from other posts, everyone seems to say that it doesn't matter if you stick vectors into a matrix via columns or rows. So i want to prove this to myself using an example from my notes. The only problem is, I get different answers. Can someone correct me? from my notes it says "show (0...
  22. C

    Drawing a Bode Plot w/ Equation Example

    Homework Statement How do you draw a bode plot? I have a simple equation: H(S)=s+10 but no school book. Can you help me understand?
  23. M

    Solving Rope Tension: Simple Example

    I'm a bit confused here with determining the tension of a rope. A very simple example will do in this case. Let's consider a weight of G hanging from a weightless rope which is tied to a ring hanging from the ceiling. The weight pulls down on the rope with the force of G and the ring pulls up on...
  24. P

    Einstein's train/embankment thought experiment as an example of backward causation

    Here is a link to the text, chapter 9... page 30: http://books.google.com/books?id=gQ8LAAAAYAAJ&printsec=frontcover&dq=einstein&ei=tondSZLWOpnGywTa_pHyDg#PPA30,M1 So I have been analyzing this thought experiment from a causal perspective and have found it to be quite unsatisfactory. The...
  25. C

    Is this a valid example of macroscopic quantum behavior?

    In some discussions here about quantum effects in the macro world, ZapperZ will only admit that things like superconductivity, Bose Einstein condensates etc. are good examples. But these are just macroscpic quantum coherent phenomena. Of course, if you have a flux qubit, you can directly...
  26. D

    Rings and Homomorphism example

    Homework Statement Give an example of a ring R and a function f: R---->R such that f(a+b)=f(a)f(b) for all a,b in R. and f(a) is not the zero element for all a in R. Is your function a homomorphism? Homework Equations Let R and S be rings. A function f:R----->S is said to be a...
  27. H

    Give an example where H is not a subgroup.

    Homework Statement If G is an abelian group, show that H = { a in G | a^2=1} is a subgroup of G. Give an example where H is not a subgroup. The Attempt at a Solution For showing H is a subgroup of G, hh' in G and h^-1 in G. (a^2)(a^2) in G also a = a^-1 in G so H is a subgroup of G...
  28. F

    Is a bicycle or dirtbike an example of f=ma?

    Hey all - this is my first post so I mght as well say hi - I'm not very smart, but find everyday physics interesting. I tried to look up Newton's Laws, but I can't figure out: Is a dirt bike or bicycle a good example of the f=ma principle? All the info I found states that the force is...
  29. I

    Examples of Pointwise Convergence of Integrable Functions to Non-Integrable

    hey guys, Any one can think of any examples ? Of a sequence of integrable functions{fn} on [0,1] that converges pointwise to a non-integrable function f:[0,1] --> R ??
  30. I

    Example of a non-integrable function f , such that |f| and f^2 are integrable?

    I'm looking for a function f:[a,b] -> R such that |f| and f2 are integrable on [a,b] any helps?
  31. pellman

    Req: A conceptual QFT example

    I need someone to point me towards an instance of a relatively simple QFT problem which illustrates what can be calculated from QFT, how it is calculated, and its physical significance. (Note the qualification "relative". I realize there are likely no simple problems in QFT.) If someone...
  32. S

    Simple example of Quaternion intuition

    Why is it that I can't describe with words the orientation of a 3D object (i.e. I can't give a set of angles that uniquely describe it). On the other hand, I can mimic fairly precisely it's orientation with my hand to describe it. A one dimensional object however, is easy to describe with an...
  33. D

    Understanding Symmetric Matrix Properties: A Puzzling Example

    Homework Statement http://img266.imageshack.us/img266/152/78148531ur5.png Homework Equations A is symmetric. The Attempt at a Solution First of all if you calculate rT you'll get qTA so why it the order reversed in the picture above? Moreover I don't see why it is zero.
  34. H

    Can any one example a function that has limit just in one point

    can anyone example a function that has limit just in one point
  35. J

    Understanding Griffiths' Example 5.8: Ienc = KL?

    I'm having a hard time understanding example 5.8 in Introduction to Electrodynamics by Griffiths. Why, exactly, is Ienc = KL? It makes sense intuitively, but I don't see how to get this result explicitly -- shouldn't the line integral be along the y-axis, and since \bar{K}=K\hat{x}, shouldn't...
  36. A

    Integration & Differentiation Practical Example

    hi, I want to know the practical use of Integration and Differentiation. I know what it is. I just want to know how can i explain it with a practical example. example : for Differentiation - the dy/dx can be explained that y is dependent on independent variable x. How can d2y/dx2 be...
  37. O

    Delta-epsilon proof (book example)

    \lim_{x \to 0} x^(1/3) I know that \delta = {\epsilon}^3 the book gives an example: \lim_{x \to 2} (3x - 2) = 4 and you chose \delta = \frac{\epsilon}{3} so 0 < |x-2| < \delta = \frac{\epsilon}{3} implies |(3x - 2) - 4| = 3|x-2| < 3 (\frac{\epsilon}{3}) = \epsilon so i...
  38. N

    Example of Lebesgue Integral but not Riemann Integrable

    What's Example of Lebesgue Integrable function which is not Riemann Integrable?
  39. fluidistic

    Into what kind of energy does the potential energy transforms in this example

    Talking with a friend about the perpetual motion (we both know it don't exist but don't know how to prove it) I came with the following system. Say you have an almost empty magnet sphere. I say almost because at its center it has a little magnet such that it is repulsed by the internal walls...
  40. J

    Computing Quotient Space: Practical Example with Vector Spaces and Subspaces

    Can anyone post me a clear example of how to compute the quotient space U/V from a vector space U and subspace V? I've seen many formal definitions but I'm a little stuck on practical use. I'm particularly interested in an example that shows how U and V being over the reals (for example) can...
  41. Y

    Friction and Max accleration, please explain this example.

    Homework Statement I'm trying to develop an expression for the maximum accerlation of a person pushing an object up a slope. I've figured out an expression for acceleration using F = MA based on the forces acting on the person and the object. Now I need to find the max accerlation. We...
  42. G

    Gonegahgah's rubber sheet example

    How close is this to what is being meant here? Let's say you have a big rubber sheet that can continue to stretch and stretch at the same rate and that it remains flat. (Yes a 2D analogy to help envision a 3D thing). On that sheet are little cars that move over the sheet. These cars...
  43. M

    How do I get the second matrix from the first one in this example

    I have: And how do I get the following matrix with elementary row operations?:
  44. M

    How do we get the second matrix from the first one in this example

    Homework Statement I have a matrix 1, 0, 1/12, 1/12 | 1/12, 0, 0, 0 0, 12, 143/12, 11/12 |-1/12, 1, 0, 0 0, 12, 143/12, 11/12 |-13/12,0,1,0 0, -12, -143/12, -11/12|-11/12,0,0,1...
  45. M

    Example from book: continuum mechanics for engineers 2 edition

    example 3.30: Let the stress tensor components σij be derivable from the symmetric tensor field φij by the equation σij = εiqkεjpmφkm,qp. Show that, in the absence of body forces, the equilibrium equations are satisfied. I don't have any idea have to solve this problem. Can someone help...
  46. G

    Mystery of Magnetic Flux: Example 6.2 Revealed

    http://img.photobucket.com/albums/v235/gsan_bot/magnetic1.jpg" Refer to example 6.2 shown in the picture, the magnetic flux = -1.2t and the deriative time of magnetic flux should be -1.2, thus, the flux is decreasing and the direction of the induced current should be reverse. but why it say...
  47. G

    Give an example of such a convergent series

    Homework Statement Give an example of a convergent series \Sigma z_{n} So that for each n in N we have: limsup abs{\frac{z_{n+1}}{z_{n}}} is greater than 1
  48. N

    Finding the Tangent Line to a Hyperbola: A Worked Example Using Limits

    Homework Statement This is a worked example from Stewart's Early Transcendentals 6e section 2.7 p. 145 for anybody curious. Let f(x)= \frac{3}{x}. Find an equation of the tangent line to the hyperbola at point (3,1). Homework Equations m = \lim_{h\rightarrow 0}\frac{f(a+h) -...
  49. A

    Exploring Two Simple Particle Models

    What are two simple objects that can be modeled as particles? This has me totally stumped...
  50. E

    Speed Limit Enforcement: Setting an Example for Adherence to Laws

    I think that the speed limit should be strictly enforced. It is horrible that we try to teach teenagers to obey important rules such as no drinking, no smoking, no harassment, no violence, etc but then when they start driving they are bombarded by examples of people blatantly breaking laws going...
Back
Top