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. S

    Statistics Problem - Venn Diagrams

    Homework Statement The entering class in an engineering college has 34% who intend to major in mechanical engineering, 33% who indicate an interest in taking advanced math as part of their major field of study, and 28% who intend to major in electrical engineering, while 23% have other...
  2. I

    Help with understanding Minkowski diagrams

    [PLAIN]http://img20.imageshack.us/img20/4083/minkowskidiagram1.jpg B is meant to have occurred before C in the S' frame, but I don't get how it's possible.
  3. M

    Circuit Diagrams w/o Resistance

    Homework Statement Solve for the unknowns. http://img535.imageshack.us/img535/7494/24800354.png http://img517.imageshack.us/img517/5765/33984576.png [PLAIN][PLAIN]http://img707.imageshack.us/img707/2511/75290122.png [PLAIN][PLAIN]http://img96.imageshack.us/img96/2593/40824092.png...
  4. S

    Special Relativity- Spacetime Diagrams

    Homework Statement http://www.maths.ox.ac.uk/system/files/private/active/0/b07.2_c7.209.pdf Q1 (Also in Q2, what is the definition of 4 momentum for a massless particle?) The Attempt at a Solution I can do the entire question if I first derive the Lorentz transformation but I...
  5. E

    Simple Problem. Finding Forces using free body diagrams.

    Hey all, here is a simple problem provided as a review for our final by my professor. I think I have everything right, but if history offers any insight into the future, I'm dead wrong. Any help is greatly appreciated.Homework Statement A 30kg box sits on a 10kg wagon. the wagon is pulled by...
  6. J

    Drawing Free Body Diagrams with torque

    Homework Statement This is a review problem i was given for my final exam tommorow, I am stuck on 1 problem, even with the answer key I am not understanding it.(also sorry but the picture won't copy from MSword, but its a cylinder rolling up a hill) (B) When the lander hits the surface...
  7. L

    Spacetime Diagrams - Help With Drawing

    Homework Statement I need to draw carefully labelled spacetime diagrams (one per section) to illustrate the following: a) The length of a 'rod' which is exactly 1.0 light seconds long when at rest along the x′-axis in one frame, and which is moving along the x-axis at 0.866c in the...
  8. L

    Draw a series of Feynman diagrams

    Homework Statement I need to draw a series of Feynman diagrams to show some processes, but I'm unsure if I'm doing these correctly. I've put them together in this one post and detailed each below in turn, hopefully this is going to make sense. I know there's a few, but I want to make sure I'm...
  9. M

    Feynman Diagrams for Exam Prep: Position vs. Momentum Space

    I'm learning how to do Feynman diagrams for an exam coming up, and have come across diagrams in both position and momentum space. If I'm asked to draw a Feynman diagram without specifying which kind, is it generally assumed that it's in position space? If I label the the incoming and outgoing...
  10. X

    Designing a Circuit with Series and Parallel Components

    Homework Statement draw a circuit diagram for a single circuit with the following conditions: a. resistor one is in series with resistor 2 and 3 b. resistor 2 and 3 are in parallel with each other c. capacitor one is in series with resistor 1 d. a voltmeter is used to measure the...
  11. V

    Calculating weights of Feynman Diagrams

    I have a two point Green's Function with a phi^4 interacting Hamiltonian and am considering the second order of pertubation, and must work out the following: T[\phi(x_1) \phi(x_2) \phi(y_1)^4 \phi(y_2)^4] = T[\phi(x_1) \phi(x_2) \phi(y_1) \phi(y_1) \phi(y_1) \phi(y_1) \phi(y_2) \phi(y_2)...
  12. H

    Standard Model Feynman Diagrams

    I have spent a while trying to get to grips with the building blocks used for constructing feynman diagrams, below is my attempt at a set of reactions, how am I doing so far? I don't think e^{+}e^{-}\rightarrow\mu^{+}\mu^{-} can happen since a gluon only interacts on particles with a...
  13. A

    Convoolution of phase diagrams

    Can anyone explain how the convolution and deconvolution of phase diagrams are described?
  14. S

    How do optodecoders, optoencoders, optocouplers, and optoisolators work?

    I need detail explanation and if possible diagrams on optodecoders,optoencoders,optocouplers and optoisolators. thank you.
  15. M

    How do I draw a free-body diagram for an object sliding down an inclined plane?

    Hello there , I don't know how to draw free body diagrams , so can u illustrate to me how to draw an FBD for an object sliding down a ramp like this one. http://ffden-2.phys.uaf.edu/211_fall2004.web.dir/Jeff_Levison/freebody_diagram.jpg illustrate this in details , please Thanks
  16. G

    RLC Locus Diagrams Homework: Solve for Z,Y Variables

    Homework Statement In a series circuit V = V<0 @50hz with an R and C, show that the graph of the loci or the port impedance, Z, and port admittance, Y, as the resistance R is varied from 0 to inf ohms are as shown. http://ivila.net/prob.pnghttp://ivila.net/loci.png Homework Equations The...
  17. S

    Drawing Spacetime Diagrams: Quick Solutions

    Suppose you have an question like: "In the t-x spacetime diagram of O, draw the basis vectors \vec{e}_0 and \vec{e}_1 Draw the corresponding basis vectors of \bar{O} , who moves with speed 0.6 in the positive x direction relative to O. Draw the corresponding basis vectors of...
  18. H

    Finding shear and moment diagrams for a simply supported beam.

    Homework Statement Homework Equations The Attempt at a Solution I know how to work shear and moment diagram problems, but I am a little confused as to how to start this one. Does it matter that the force is hanging off the bracket? Can I just continue as if the force was acting...
  19. N

    Software for drawing Feynam diagrams

    Hi, Could you please advise me any software (and location) to draw Feynam diagrams? I knew one softare Feyndraw but lost it... Thanks
  20. I

    Representation of properties of Complex Numbers in Argand Diagrams

    Homework Statement Draw an argand diagram to represent the follwing property: real(z) < abs(z) < real(z)+img(z) Homework Equations z = x+iy; real(z) = x abs(z) = sqrt(x^2 + y^2) img(z) = y The Attempt at a Solution substituting original expression with x, y, and sqrt(x^2 + y^2)...
  21. R

    How Do You Calculate Heat Transfer in Thermodynamic Cycles?

    Homework Statement A cylinder with a piston contains 0.250 mol of oxygen at 2.40  105 Pa and 355 K. The oxygen may be treated as an ideal gas. The gas first expands isobarically to twice its original volume. It is then compressed isothermally to its original volume, and then it is cooled...
  22. V

    Symmetry factors in Feyman Diagrams

    Sorry I am spamming the forum, but I have yet another question on Feynman diagrams - Please see attached picture. Apparently the symmetry factor for this FD is 1 - I am trying to understand why. My notes explain that "the symmetry factor is 1 because: φ(x1) contracts to φ(y1) in 4 different...
  23. S

    Free-Body Diagrams: Several Objects and Newton's Third Law

    Homework Statement A box of mass m2=3.5 kg rests on a frictionless horizontal shelf and is attached by strings to bodes of masses m1 = 1.5 kg and m3 = 2.5kg. Both pulleys are frictionless and massless. The system is released from rest. After it is released, find (A) the acceleration of each...
  24. J

    Understanding Grounds in Schematic Diagrams

    Im very confused when I see schematic diagrams with ground symbols. In my understanding, those ground symbols are placed in the negative connection in the circuit . Can someone explain me what are "grounds" for?
  25. D

    CNC Turning Process: Learn the Basics & Machine Diagrams

    could anyone help me with cnc turning process, diagram of machine. it be better if you can give me manual book about it. i need to learn about cnc from introduction and part of that machine. I'm new in this course.
  26. H

    Free Body Diagrams: Static Equilibrium

    Homework Statement Blocks A & B each have mass 5kg, and all contact surfaces are frictionless. Determine the force F needed to keep the blocks in static equilibrium, and the forces on all contact surfaces. Homework Equations I know I need to find where Fx= 0 and where Fy= 0. The Attempt...
  27. L

    Ray Diagrams: 2nd Incidence Ray - Which Is Correct?

    Hello. I have a concern in relation to ray diagrams. So I read that the first incidence ray I draw must be parallel to the principle axis and be reflected such that it passes through the principle axis. Ok so this part isn't too much of a worry. However it states that the second ray must be...
  28. M

    Thermodynamcics quesstion (Diagrams)

    In a question He gives that : 0.1 kg of water contained in cylinder-piston device . Water is initially at 1.5 bar and 403 k (Kelvin). More 0.1 kg of water at 2 bar and 403 kelvin is admitted to the cylinder. Through out this filling process, pressure and temperature of cylinder are...
  29. E

    Thermal Equilibrium and Energy System/Phase Diagrams

    Homework Statement A 0.5kg piece of ice(water) at an initial temp of -65 degrees Celsius is placed inside a well-insulated container with 3.0 kg of tea at an initial temp of 20 degrees Celsius, and the two are allowed to come to thermal equilibrium( the tea can be treated as water with respect...
  30. B

    BrendanUnderstanding Topological Terms: Venn Diagrams and Examples

    Hi Guy's I am just starting out in topology and I was wondering if someone might know of a good link that may have venn diagrams of some important topological terms ie closure of A, int A, limit points etc. regards Brendan
  31. D

    Loading reaction with shear and bending moment diagrams

    a motor vehicle has a wheel base of 3m. four posta ramp with two wheels each side. ramps front wheels have 6kn and rear 8kn. determine the reaction of the supports on the beam? vehicle is raised 2.25 m vertically this is done in 45 seconds calculate power of electric motor required use...
  32. V

    Plotting Oddities on H-R Diagrams (B-V): What's Going On?

    I was plotting the color magnitude diagram of a globular cluster and I noticed something odd. On most H-R diagrams, the turn-off from the main sequence to the giant branch is somewhere between (B-V) magnitude values of about .5-1.0. On my plot, the turn-off is between about -.4 and -0.1...
  33. pedroall

    Calculating Multiloop Diagrams in Phys.Lett.B267:382- 388,1991

    Hi I need you help a find one article, calculation of multiloop diagrams in arbitrary order Published in Phys.Lett.B267:382-388,1991, please. Thank.
  34. J

    Placements of vector diagrams and angles in 2-D collisions

    Homework Statement Regarding two-dimensional collisions, I just don't understand why my book suddenly changes vector positions and theta angles at different places than what I was accustomed to. I understand that they're getting me to think by changing questions and answers, but I'm confused...
  35. J

    Understanding Gravity with Embedding Diagrams

    A help to understand how gravity works in our universe is called an embedding diagram. It is a three-dimensional representation of what happens to a two-dimensional universe in the presence of mass, i.e. the plane is distorted into a 'gravity' pit. What happens if we extend this concept to...
  36. K

    Minkowski spacetime diagrams, what does the hyperbola represent?

    Homework Statement Draw a clearly labelled “Minkowski spacetime” diagram illustrating two events ((1) a farmer firing his laser gun at his cow, which is sitting along his positive x-direction, and (2) the cow dying) as observed by two observers (S at rest in the farmer’s and cow’s frame...
  37. B

    Feynman diagrams - neutrino interactions

    I have some well ordered feyman diagrams which have an incoming neutrino interacting at a vertex with a w boson and emitting an electron. since a neutrino can pass through some 18 light years of led without interacting, I'm wandering how a single neutrino interacts at this vertex?
  38. Grimble

    Rotation and Minkowski diagrams.

    Roger Penrose is reported to have said: And I understand that, in Minkowski space-time, the relative velocity between two inertial frames of reference is a rotation of the frames, with respect to one another, about a common origin. Now in the description of Minkowski diagrams given...
  39. P

    Wick's Theorm to Feynman Diagrams?

    Is this right? To calculate a scattering amplitude for a certain scattering event, you take the term in the wick's expansion of the S-Matrix that suits your situation best. Then you draw a Feynman Diagram that corresponds to the term in the wick's expansion, then just use the Feynman Rules to...
  40. S

    Drawing Schematic diagrams for series and parallel cicuits

    hi everyone, I want to know how i can draw the schematic diagrams of the circuits. I understand the therory but i have no idea how you make the circuits and draw the schematic diagrams of them. Thanks
  41. D

    What Distinguishes Circuit Diagrams from Wiring Diagrams?

    What is the difference between a circuit diagram and a wiring diagram. And while your at it can anyone explain the difference between diagram that routes fibers/ connections to from a battery to a lamp for example as opposed to the alternate... one that routes to the connector on the battery...
  42. F

    Can Venn diagrams resemble Cantor sets with infinitely many sets?

    if you go down to the section called "do they always exist?" you'll find a venn diagram for 6 sets: http://www.combinatorics.org/Surveys/ds5/VennWhatEJC.html would a horizontal cross-section resemble a cantor set, if there were infinitely many sets? it looks like it would vaguely resemble...
  43. S

    Help in mathematical modelling phase diagrams

    Help in mathematical modelling phase diagrams! :( Mathematical modelling question on predator-prey models logistic prey-predator model with prey logistic growth dx/dt= ax - bx^2 -cy dy/dt= -ey + fxy ax = growth rate of prey in the absence of predation -cxy = the death rate per...
  44. J

    Kruskal and Penrose diagrams for a Minkosky spacetime

    Hello I'm looking for diagrams (Kruskal and Penrose diagrams) representing Minkosky spacetime. I found two diagrams at http://nrumiano.free.fr/Estars/int_bh.html (the two first diagrams of the page). Do they represent a Minkowski spacetime ? Thanks, Jeff
  45. qspeechc

    Computer Program for Math Diagrams

    Hi everyone. So I'm typing up some notes for some high school kids I'm helping with their math (I'm not tutoring them for money, I'm helping them informally). I want to put diagrams in my notes, you know the usual stuff: graphs of the usual functions; explaining concepts in diagrams; geometry...
  46. S

    Shear force and bending moment diagrams

    Hi. The question is: Draw the shear force and bending moment diagrams for the simply supported beam shown below. State the values of the greatest shear force and bending moment, and the bending moment at D. The diagram is attached as is my attempt at the answer. I hvae not stated the values of...
  47. A

    How can I draw scaled vector diagrams for given vectors?

    I'm confused about how to draw scaled vector diagrams. I have a scale and I can do the first two vectors, but then I get confused. Let's say my vectors are 10 cm at 0 degrees, 5 cm at 45 degrees, and 11 cm at 212 degrees. How do I draw this? I have this:
  48. R

    Do we really need loop diagrams?

    Is it really necessary to learn how to calculate loop diagrams in QFT? In the Wilsonian approach, you only need to calculate tree diagrams. In the loop approach, you have to relate the experimentally measured coupling constant to the bare coupling constant, and I guess the difficulty is...
  49. G

    Free body diagrams and adding forces

    Homework Statement In each of the two free-body diagrams, the forces are acting on a 2.6 kg object. For each diagram, find the values of ax and ay, the x- and y-components of the acceleration, with F1 = 5 N and F2 = 3 N. Picture is attached. (a) Diagram A ax =____ m/s2 ay =____ m/s2 (b)...
  50. K

    LaTeX Create Professional Circuit Diagrams in LaTeX - Top Library Recommendations

    Hi Does anyone know any good libraries to use to draw circuit diagrams in LaTeX2e? (except CIRC which looks ugly in my opinion)
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