What is Diagrams: Definition and 689 Discussions

A diagram is a symbolic representation of information using visualization techniques. Diagrams have been used since ancient times on walls of caves, but became more prevalent during the Enlightenment. Sometimes, the technique uses a three-dimensional visualization which is then projected onto a two-dimensional surface. The word graph is sometimes used as a synonym for diagram.

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  1. alexandria

    Net acceleration, free body diagrams, velocity, force normal

    Homework Statement Homework Equations relevant equations are provided with each question below The Attempt at a Solution please check my solutions to ensure they are correct. thanks. a) [/B] b) Calculate net force: Fnet = FA + Ff + Fg Fnet = (1.20 x 104 N [up]) + (1.40 x 103 N [down])...
  2. cjpa

    A Understanding Force Diagrams for Hydraulic Cylinder Selection

    Hello world, I have to select an hydraulic cylinder to counter-balance a force. For that purpose I need to know the force that my hydraulic cylinder must exert. Typically I would use the horizontal part of F2, but being that force with diferent degrees, doen't my friction play an important...
  3. C

    I Dependence on UV cut off on some $\phi^4$ diagrams

    Consider the one loop corrections to the propagator and the vertex in ##\phi^4## theory in the attachment The former gives an integral representation proportional to ##\int d^4 k/k^2## in ##4## dimensions while the latter gives a representation ##\int d^4 k/k^2 (k+p)^2## where ##p## is the...
  4. Jefffff

    Special Relativity and Space-Time Diagrams

    Homework Statement [/B] S' is moving at 0.5c relative to S. Two events, stationary with respect to S, occur at a distance of 4 light years from the origin at time 3 years and 6.5 years. Estimate the time between the events as measured by an observer in S'. Check your solution with the time...
  5. F

    I Virtual particles in Feynman diagrams and not

    I know some people here hate the subject of virtual particles. So I will try to narrow my questions. Granted, virtual particles are just attempts to describe the math and are not real in and of themselves. But there seem to be a couple of different kinds of virtual particles (in the math)...
  6. Grimble

    B Exploring Light Cones & Causality Diagrams in Relativity

    There is something that has been puzzling me about the way that light cones are drawn, when we consider causality diagrams. Lines representing a substantial point (as Minkowski referred to them) that is traveling as close to the speed of light, that is virtually at the speed of light, is drawn...
  7. P

    Understanding Bending Moment Diagrams for Multiple Planes

    can someone explain why this problem would involve two bending moment diagrams, one for the xy plane and another for the xz plane? Also, how are the reaction forces at B and C determined each time?
  8. C

    Symmetry factors of some diagrams

    I have drawn five connected diagrams that arise in ##\phi^4## theory. I was wondering if the symmetry factors I have for each of them are correct and if I have missed any graphs. I only want to consider the case of ##V=3, ## with ## J=0,...4## in turn. (V: number of vertices which i denoted by a...
  9. S

    Unraveling Hadronization: Understanding Particle Decay and Feynman Diagrams

    Hello everyone, I've been wondering for a while how is it possible to determine which decays are possible from a particle or, given a decay be sure that the given decay is possible and hence draw a Feynman diagram of it. I know I have to take into account conservation charge, energy...
  10. FrancescoS

    Dyson equation and Feynman diagrams: a brief explain

    Hi! I have found a note about Generating functionals that seems to be very direct. Since I faced a difficulty many times without solve it, I would like if anyone can explain me my troubles. You can fine the note here (link). In the following figure, the author describes the 3-point green...
  11. M

    Quick Question about Math : Diagrams

    Homework Statement A system , which comprises three components (A , B and C ) , the system fails if the first component ( A) has failed or if the other two fail simultaneously. It will be assumed that all components operate independently. Question: Choose from the following diagrams that best...
  12. T

    Zone refining and phase diagrams

    Homework Statement From Ashby's "Engineering Materials"[/B] Homework Equations k=C_o/C_s=m_1/m_2 The Attempt at a Solution Solving for k m_1=(660-548)/(0-32)=-3.5 m_2=(660-548)/(0-7)=-16 k=m_1/m_2=0.219 C_s=C_o*(1-(1-0.219)exp(-xL/0.219))How do I proceed from there? Also, how do I...
  13. J

    What is the role of focal lengths in ray diagrams for telescopes?

    When you look up a ray diagram for a telescope you get the following: From reading my book it seems clear that the objective lens forms and image on the focal plane. This then serves as an image for the eyepiece. Since the focal length of the eyepiece at the focal length of the objective lens...
  14. L

    Why are disconnected diagrams dropped from S-Matrix

    I am talking about perturbative quantum field theory. When calculating elements of correlation functions(which then I use to calculate S-matrix elements) one always comes up with connected and disconnected diagrams. These disconnected diagrams are usually dropped from the calculation and I...
  15. S

    SQL joins illustrated as Venn diagrams

    In my opinion, using Venn diagrams, or set theory in general, to help aspiring SQL programmers (yes, SQL is a programming language) understand joins causes nothing but confusion for literal-, logical-thinking persons like myself. Allow me to explain my opinion. Venn diagrams have always been...
  16. barbara

    MHB How Do Truth Tables and Venn Diagrams Verify Logical Equivalence?

    How would I use a truth table to show that the statement p v (q ^ r) is equivalent to (p v q) ^ (p v r) or design a venn diagram for this. and show that this statement is not equivalent to (p v q) ^ r.
  17. W

    Can we Draw Dependency Diagrams in MySqL?

    Hi all, I am given a data table, with dependencies. Can I use MS MySQL workbench to draw the associated dependency diagram? Thanks.
  18. S

    Converting PV Diagrams to TS Diagrams in Thermodynamics

    Hello, Can u please explain how to convert a PV diagram to a TS diagram in thermodynamics. Thanks in advance
  19. Immortalis

    Learning Feynman Diagrams: Matrices & Dirac Adjoints

    I am trying to learn about Feynman diagrams and am confused by some of the notation. In particular, what do matrices, in particular the Dirac adjoint, have to do with Feynman propogators and why are they in imaginary terms?
  20. D

    Shear force and bending moment diagrams question

    Homework Statement In the image uploaded below, a boxed shaped object is shown. It is floating in water so the forces that act on it are buoyancy and gravity. The first and the last compartments are filled with evenly distributed weight. The middle 2 compartments are empty. Specifics are...
  21. H

    How to calculate Feynman diagrams in phi^4

    For quartic scalar field theory these are some of the lowest order diagrams (taken from the solutions to 9.2 srednicki). I'm wondering if someone can give me an intuition of how to actually calculate them. What I'm thinking is that vertices are $$\int \frac{d^{4}x}{(2\pi)^{4}}$$ and for the...
  22. H

    Vacuum diagrams vs. tree diagrams vs. loop diagrams

    Could someone please tell me the difference between tree diagrams and loop diagrams? If I'm thinking correctly tree diagrams are before contracting? Also how do vacuum diagrams fit into the picture? Thanks!
  23. H

    Order of scalar interaction impact Feynman diagrams

    On page 60 of srednicki (72 for online version) for the $$\phi^{3}$$ interaction for scalar fields he defines $$Z_{1}(J) \propto exp\left[\frac{i}{6}Z_{g}g\int d^{4}x(\frac{1}{i}\frac{\delta}{\delta J})^{3}\right]Z_0(J)$$ Where does this come from? I.e for the quartic interaction does this...
  24. T

    ELI5: Antiparticles in Feynman Diagrams

    Hi!, I am studying for an introductory course in QED and Feynman Diagrams. Everything we see is like a first order approach and I am having some trouble understanding antiparticles in Feynman Diagrams: Why is it that we put an antiparticle that is leaving as if it is entering the interaction...
  25. Andrea M.

    Drawing Feynman diagrams with feynarts

    I'm trying to draw Feynman diagrams with the feynarts.sty package for LaTex. The problem is that if I write the following code \begin{feynartspicture}(150,150)(1,1) \FADiagram{} \FAProp(0.,10.)(6.,10.)(0.,){/Straight}{0} \FALabel(3.,9.18)[t]{$1$}...
  26. Aristotle

    Need clarification on Gate Delays & Diagrams

    Homework Statement This is just an example/solution to a timing diagram/gate delay for the circuit of logic gates. I am reading ahead of the chapter on gate delays & time diagrams, however, the book doesn't provide as much information. I am unsure how the solution came about in drawing their...
  27. S

    Feynman diagrams for phi phi -> phi phi

    Homework Statement Compute the matrix element for the scattering process \phi \phi \to \phi \phi Homework Equations The Lagrangian is given by L = \frac{1}{2} \partial_{\mu} \phi \partial^{\mu} \phi + \frac{\alpha}{2} \phi \partial_{\mu} \phi \partial^{\mu} \phi + \frac{\beta}{2} \phi^2...
  28. Mr Davis 97

    Representing Free body diagrams

    I have a simple question. I know that the objects that we work with in introductory physics are point particles. Thus, say we have a picture frame that is put on a wall. There is a wire holding it up, where the wire is attached to the top right and the top left corners of the frame. The passes...
  29. B

    Please help with A/C calculations and phasor diagrams

    I have completed the questions in the attachment I just need someone to tell me if they are correct and I'm doing them right. Thanks.
  30. N

    Similarity between P&ID and Electrical diagrams?

    Dear Forum Memebrs, Could you please advise if it is possible to think that in some instances the flow of fluid in P&ID diagram is similar to the flow of electrical current in circuit boards: in order to have an electric current you have to have a potential difference across two points (which...
  31. W

    Setting up systems of forces and free body diagrams

    Homework Statement Suppose I've got a static mass on a downward plane. (For instance a car on a drive way). How would you set up this free body diagram? Homework Equations F = f1+f2...etc The Attempt at a Solution My preference is A, but I've seen it displayed in examples in my book as B...
  32. gacb17424

    Find reactions at supports and bending/shear/axial diagrams

    Homework Statement Force by uniform loading = 20(5) = 100kN Vertical component of the uniform loading = 20(5)(3/5) = 60kN Horizontal component of the loading = 20(5)(4/5) = 80kN vertical reaction at roller support = Vr vertical reaction at pin support = Vp Homework Equations Fx=0, Fy=0...
  33. mr.tea

    Exploring the Meaning of Cobweb Diagrams

    Hi, I saw at the lecture something that called Cobweb diagram/plot and it was given without too much explanation. We were working on recursive sequences(Math major, first semester). The sequence was \frac{1}{2-\frac{1}{2-...}} I tried to find an explanation to this diagram; why did we choose...
  34. J

    Software for drawing group lattice diagrams?

    Hi, I was wondering if there is code already available to draw group lattice diagrams if I already know what the subgroup structure of the group and its subgroups are. For example, it's easy to determine the subgroup lattice for cyclic groups simply using divisors via Lagrange's Theorem...
  35. W

    I'm making an Arithmetic Error, Electrostatic force diagrams

    Homework Statement Three charged particles are placed at each of three corners of an equilateral triangle whose sides are of length 2.7 cm . Two of the particles have a negative charge: q1 = -6.0 nC and q2 = -12.0 nC. The remaining particle has a positive charge, q3= 8.0 nC . What is the net...
  36. G

    Lagrangian of fields from Feynman diagrams

    ¿How is possible deduce the Lagrangian of the fields of a theory knowing only his Feynman Diagrams?
  37. W

    Probability, Set Theory, Venn Diagrams

    Homework Statement Let A and B be two events such that P(A) = 0.4, P(B) = 0.7, P(A∪B) = 0.9 Find P((A^c) - B) 2. Homework Equations I can't think of any relevant equations except maybe the Inclusion Exclusion property. P(A∪B) = P(A) + P(B) - P(A∩B) This leads us to another thing P(A∩B^c)...
  38. Dilatino

    Introduction to Young-tableaux and weight diagrams?

    I am looking for a short pedagogical introduction to Young-tableaux and weight diagrams and the relationship between them, which contains many detailled and worked out examples of how these methods are applied in physics, such as in the context of the standard model and beyond for example. I am...
  39. C

    How to draw Feynman diagrams

    I am reading the book tilted "quantum field theory in a nutshell(second version)" by A.Zee. On the page 45, for example there is a term \frac{1}{m^2}λJ^4. The question is that how to related it to the Figure 1.7.1. or that, How can I draw the three diagrams in Figure 1.7.1 from the term...
  40. Anchovy

    Confused by these proton decay diagrams

    I have some confusion over some diagrams involved in proton decays in SU(5). I've seen a few like this that look weird to me. Here is one I found where the colored Higgs triplet does the job: Straight away I don't know what to make of this because I've only ever seen diagrams where fermions are...
  41. K

    Classical Practicing Free Body Diagrams & improve problem solving skills

    Hi, I once considered myself enough to be decent enough to solve some problems but lately I'm thinking to revisit and start solving problems again. I would like to know whether there is a book good which has problems (starting from basic to tough ones) for practicing free body diagrams. The book...
  42. naima

    Penrose Diagrams: How to Create with Known Spacetime Metric

    Hi Pfs Is there a method to draw a Penrose diagram when the spacetime metric is known? Thanks.
  43. Safinaz

    Understanding Color Factors in Feynman Diagrams

    Hi there, In paper as : http://authors.library.caltech.edu/8947/1/GREprd07.pdf I don't understand the colour factor associated with two gluons and single octet scalar as the first Feynman diagram in fig. 3 ? In eq. 27, this colour factor is given by ## (d^{abc})^2 ## .. so, how did this come...
  44. rolotomassi

    Green's Functions and Feynman Diagrams

    I've been learning about Greens functions. I'm familiar with how to find them for different differential operators and situations but far from fully understanding them. We were shown in lecture how they can be used to obtain a perturbation series, leading to Feynman diagrams which represent...
  45. EverGreen1231

    Logic diagrams for relays help

    Good morning, I'm looking at some logic diagrams for relays and have encountered something that I've never seen before. I haven't looked on the internet extensively since I thought the folks here at the forums would be able to answer my question more quickly. My experience with logic is...
  46. Ibix

    Interactive Minkowski diagrams tool

    This is a little toy I put together that I thought might be of interest: http://ibises.org.uk/Minkowski.html It's an interactive Minkowski diagram. You can add events and connect them up with straight-line paths, then Lorentz boost either to a specified velocity or to the rest frame of a...
  47. K

    Free body diagrams and Newton's Law

    Homework Statement 2 masses, m1 and m2 are connected by a cord and placed on a frictionless table as shown in the diagram below. m1 slides on the frictionless table while m2 is hanging from a light frictionless pulley. What would be the mass of the hanging mass m2 if we know that the tension in...
  48. CAH

    Feynman Diagrams, exchange particle?

    Exchange Particles are to show the transfer of (for example) +/- charge to the other side so the charges balance. But I don't understand... Beta plus decay: p → n + e+ + νe. This is just an example, the Feynman diagram shows a W+ boson transferring the positive charge to the right hand side...
  49. R

    A more complicated question on lipid phase diagrams

    Homework Statement Homework Equations None. The Attempt at a Solution This is the final part of a past exam question. I've got through the first parts and can (thanks to a separate question I asked here) read the phase diagrams and find melting points etc. However now it's asking for...
  50. D

    How to draw self-energy diagrams in phi^4 theory

    Okay guys so I the lagrangian \mathcal{L}=\dfrac{1}{2}\left( \partial_{\mu}\phi\partial^{\mu}\phi-m^{2}\phi^{2} \right)+\dfrac{\lambda}{4!}:\phi(x)^{4}: where \phi(x) is a real scalar field. I want to know how you can draw the self-energy diagrams at order \lambda and \lambda^{2} for a 2 => 2...
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