Diagrams Definition and 689 Threads

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. J

    Finding Applied Force with Free Body Diagrams (Grade 12 Physics)

    Homework Statement You have a 10kg object that is thrown down a building. The distance from the ground to the building is 50m. The initial velocity of the object is 5 m/s. What is the applied force and what force does the object hit the ground with? Homework Equations Fapp= Fnet+Fg...
  2. R

    MATLAB Plotting Bode Diagrams with Exponential & Complex Transfer Functions

    Hi there, I'm having a hard time trying to plot a Bode Diagram here in MatLab. The transfer function not only has an exponential function in it, but also has 3 unknowns to which I am not supposed to assign value, and on top of that it is a complex number. Let me write it down to you...
  3. H

    Software for drawing simple objects and vectors (free body diagrams)?

    Hi. I'm looking for a drawing tool which may help me draw simple figures with vectors and angles. I've tried many but they're so complicated... e.g. Photoshop, Power Point, Edraw, and some others. The ideal one would be one which is designed for this... I mean a program that has a tool, for...
  4. N

    How do I assign Greek indices in Jaxo Draw for scientific diagrams?

    Dear PF, I am trying to draw some diagrams in jaxo draw, but I don't know how to assign Greek index whenever necessary, can you please advise me step by step... as i understand it is related to some "postscript" issues that i don't know how to set up ... would you be so kind and drop me a...
  5. J

    Bending moment diagrams with a hinge?

    Homework Statement Hey guys I'm having trouble drawing the bending moment diagram for this beam with a hinge? I'm not sure where to start? I've looked at stuff online and its completely different to the stuff in my textbook Homework Equations equilibrium equations ƩFx=0 ƩFy=0 ƩM=0...
  6. C

    Feynman diagrams for spin 1/2 particles

    I think I have a pretty good handle on how scalar field scattering works in QFT, so now I'm trying to wrap my head around spin 1/2 particles, and I'm having a bit of trouble with it. For instance, in N + \phi \rightarrow N + \phi scattering, an application of the Feynman rules leads to an...
  7. H

    Draw Feynman Diagrams: e+e- to e+e-, μ+μ-, γ e-

    Homework Statement Draw the Feynman diagram vertex corresponding to the interaction Lint = eAμJμ, where Aμ is the electromagnetic field and e is the coupling constant. Draw all the Feynman diagrams in quantum electrodynamics to O(e2) describing the processes: (i) e+e- ----> e+e-, (ii)...
  8. T

    Shearing/Bending diagrams, forces acting on beam

    Homework Statement - Compute the reactions at the supports - Draw complete shearing force and bending moment diagrams - Determine magnitude and location of maximum absolute value of shearing force and bending moment - Use free body diagram approach to determine internal shearing force and...
  9. S

    What is a good (LINUX) software package for drawing diagrams?

    Can anyone recomment any good linux software for produce "physics type" diagrams that would be of acceptable quality for putting into reports? When I say "physics type", I mean we're basically talking about straight and curved lines, vectors (arrows), angles and so on... of course I want to be...
  10. C

    Software for drawing simple diagrams for reports

    I'm looking for some software I can use to draw reasonable technical diagrams- the sort of diagrams you'd find in online lecture notes, or in maths/engineering textbooks, i.e. simple shapes, arrows, curves etc. It's hard to describe what I mean, hence why I've came after nothing on Google...
  11. N

    Coupling order in Fenman diagrams

    Sorry if this appears a basic question, but could you pls advise me is it possible to have a two identical vertexes but with different strength coupling? I have some toy Lagrangian and when I calculate Feynman rules I get for one vertex following expression: (M1+M2)*(combination of...
  12. R

    What can be Determined from Colour-Colour Diagrams?

    Hi, I have a colour-colour (that is, V-R against B-V) diagram of a young open cluster, and I was wondering if anyone has any suggestions on any information that can be gleaned from such a diagram? I have searched the internet and these forums to no real avail. There is a clear linear line...
  13. H

    Understanding Young Diagrams from Physics 751: Solving Eqn 4.14

    Hello my friends! I'm trying to learn the meaning of young diagrams from Christoph Lüdelins physics751 (google it :) but I can't figure out what is happening in eqn 4.14. I understand why 4.13 are the possible p-cycles but how does eqn 4.14 apply to this S_5 example? (Sorry that I could not...
  14. M

    Basic question about Feynman Diagrams

    Can a vertex of a Feynman diagram have more than three particles going in or out from it? Assuming all other conservation laws are obeyed, of course. I haven't seen this being explicitly stated but all the Feynman vertices I have seen have three arms attached. Thank you.
  15. A

    Uniform Circular Motion Free Body Diagrams

    Homework Statement A circular-motion addict of mass 82.0 kg rides a Ferris wheel around in a vertical circle of radius 14.0 m at a constant speed of 7.10 m/s. (a) What is the period of the motion? What is the magnitude of the normal force on the addict from the seat when both go through (b)...
  16. D

    Intuitive diagrams for Feynman diagram

    I did not find wikipedia article to be quiet intuitive. Any online sources or your own descriptions. I would be greatful.
  17. R

    Feynman diagrams for more than two particles

    Are the Feynman diagrams still applicable to more than two particles interactions? This would be very helpful in modelling many-body scattering cross-sections.
  18. E

    Feynman diagrams for Bremsstrahlung

    Hi, the breaking radiation emitted by the scattering of an electron with an external field is described by the hamiltonian: H=\bar \Psi^- (\displaystyle{\not}{A}_e + \displaystyle{\not}A) \Psi^+ where A_e is the external static classical field, while A is the quantized field. The...
  19. I

    Energy Diagrams Schottky Barrier Book

    I am looking for a book that explains how a Schottky barrier is formed at a semiconductor metal interface. I have found the attached diagram in a source that i cannot see the references for. Does anyone know of a book containing such a diagram and an explanation of the formation of a Schottky...
  20. D

    Trying to understand how to make Motion Diagrams

    Trying to do my first Physics home work assignment for college and I'm not really making any headway. He went thru the martial so fast while throwing in calculus that I'm not sure if I do or don't need. My main problem with Motion Diagrams is I'm not sure how accurate I'm supposed to be and...
  21. Femme_physics

    Did I get my block diagrams right?

    In the drawing is described a system to the control flow of a liquid. The control is done by changing the rotary speed of the electrical engine that moves the pump. Changing of the speed is done by changing the voltage for the motor.BUILD A BLOCK...
  22. C

    Time dilation in minkowski diagrams

    Hey! I'm trying to understand time dilation in terms of minkowski diagrams. Below I've added a diagram showing the two coordinate systems where the primed one moves relative to the unprimed one with a speed v. http://mindseye.no/wp-content/uploads/2012/01/time1.png My reasoning in this...
  23. R

    Proving me ? partial orders :hasse diagrams

    partial orders :hasse diagrams theorem : if [A,R] is poset and A is finite , then A has both a maximal and a minimal element A={a1,a2,a3...an} but i know prove it is maximal , but i not know how i prove it is minimal ? please answer ?
  24. J

    PV Diagrams (Curve v. Straight)

    Why are some lines on a PV digram curved and some lines are straight?
  25. A

    Micro structure from equilibrium diagrams

    I have this question: "What micro-structural features of metal alloys can be studied by using equilibrium diagrams and how? Can the equilibrium diagrams be used for some other purposes? What are the limitations?" I think that only the composition of micro-structure can be predicted in a...
  26. K

    Confusing free-body diagrams help

    Homework Statement 1. A truck is pulling a car on a horizontal highway using a horizontal rope. The car is in neutral gear, so we can assume that there is no appreciable friction between its tires and the highway. As the truck is accelerating to highway speeds, draw a free-body diagram of...
  27. L

    PV diagrams monatomic ideal gas

    Homework Statement Suppose a monatomic ideal gas is changed from state A to state D by one of the processes shown on the PV diagram. (Let V1 = 4.80 L and P1 = 3.30 atm.) (a) Find the total work done on the gas if it follows the constant pressure path A−E followed by the constant...
  28. M

    Slope and deflection diagrams using conjugate beam method

    Homework Statement Construct the slope and deflection diagrams. I've attached the problem with the original diagram (problem #1). The Attempt at a Solution Considering the number of diagrams required, I thought it would be best to attach a photo of my work. I drew the shear and moment...
  29. R

    Active Force Diagrams/ Virtual Work

    Homework Statement Homework Equations ? The Attempt at a Solution a) y=2Lcos(θ) x=2Lsin(θ) b) I haven't started the next question as I want to make sure the active force diagram is correct first.. If somebody could just check the diagram and help me with where I'm going...
  30. Femme_physics

    Block Diagrams - Control Engineering. Basic Question

    (Go on easy on me, this is my first attempt and first course at control engineering) Homework Statement In systems who has a huge consumption of hot water, such as food factories, chemical industries or hospitals, it's customary to heat the water through fuel type "mazut". the hot water...
  31. M

    PV diagrams for heat engines are legitimate ?

    PV diagrams for heat engines are "legitimate"? Hello forum Since my student days i was wondering about how is it possible to represent the cycle of the gas in a heat engine (e.g. otto cycle) in a PV or whatever diagram when it is obvious that the gas is not in equilibrium during the process...
  32. J

    Statics Shear Force and Bending Moment Diagrams Problem

    Figured it out.
  33. B

    Deriving Bending Moment Diagrams from Shear Force Diagrams

    Folks, I was checking to see was it possible to determine the bending moment diagram from the shear force diagram. Seemingly one can do it for simply supported beams but if we consider a rigidly supported beam on either end its not possible to derive the bending moment diagram from the shear...
  34. M

    Circuit Diagrams Explained: 3-Line, Single Line & Ladder

    HI every one,i m confused between three line,single line and ladder circuit diagrams.Plz tell brief discription about them.
  35. M

    Shear and moment diagrams: help with moment diagram

    Homework Statement This would be really difficult to type, so I've attached the given problem and my work. I think it is legible for the most part, but let me know if you have problems reading something. The Attempt at a Solution My shear diagram worked nicely. I've run into a problem...
  36. G

    Solve Bifurcation Diagrams: Find Critical Values of r

    Homework Statement For each of the following equations sketch the bifurcation diagram, determine type of bifurcation, and find the critical value of r. ẋ = rx + cosh(x) ẋ = x(r - sinh(x)) ẋ = rx - xe-x2 The attempt at a solution Fixed points satisfy f'(x) = r + sinh(x) = 0 ⇒ x* =...
  37. P

    Logic Gates (OR and AND) Wave Form Diagrams

    If you take a look at the attachment that I have posted, you will see 4 wave diagrams labeled A, B, C, D, respectively. My objective to is to answer the questions after the A-D diagrams. The first one is a AND logic gate with A and B. So how would I combine A and B. Do I draw only the highs of...
  38. Q

    What Are the Most Important Feynman Diagrams in Particle Physics?

    Hi, what do you think are the most important Feynman diagrams (or probably better: what do you think are the most important processes in particle physics)? Thanks, Quantum Cosmo
  39. J

    How Do You Construct Shear and Moment Diagrams for a Frame Beam?

    Homework Statement I need to create N-, M-, V- and T- diagrams for a frame beam. (see picture attached) The beam is 1m. The force on top is 1200N. Homework Equations /The Attempt at a Solution I started with the shear diagram. But i was having difficulties with the two normal-forces on the...
  40. T

    Shear Force and Moment Diagrams

    Homework Statement This cantilever confuses me so much. The negative point loads and negative distributed load. And is the other one that's -40kN/m moment/torque or something. My question is how do I do the shear force and bending moment diagrams of this. Am i suppose to redraw the diagram...
  41. P

    Calculating Work Done by Ideal Gas at Constant Pressure: PV Diagram Analysis

    Two moles of an ideal gas are heated at constant pressure from a temperature of 29C to 110C. calculate the work done by the gas So work is the area under the PV curve, the only problem is I have no volume or intital pressure so PV=nRT doesn't help. Then I was thinking about Q= delta U -W...
  42. S

    Feynman Diagrams on Srednicki's book.

    I am reading Srednicki's Quantum Field Theory recently. I have thought over the descriptions of the Feynman Diagrams on his book in chapter 9, but I still can not understand what these diagrams mean and how do they help us to calculate the right-hand side of the equation 9.11 on the book. Is...
  43. tiny-tim

    Geometry and trig proofs, with diagrams

    http://www.mathsisfun.com/geometry/" http://www.mathsisfun.com/algebra/trigonometry-index.html"
  44. P

    Posting Diagrams Multiple Times: Is it Possible?

    I've got a few diagrams (on the twin paradox), that I'd like to repost occasionally. It seems that if I just post a link, people are less likely to look at them. PF, however, complains that I've already uploaded the file. I can tweak it a bit, and re-upload it, but that seems anti-social...
  45. M

    Penrose diagrams, reference request.

    Where can one find a general and detailed exposition of Penrose diagrams? What I have seen so far, in the books, are relatively brief general comments and a couple of specific examples. Usually Minkowski and Schwarzschild metrics, sometimes one or two more.
  46. S

    How Do You Interpret Shear and Moment Diagrams?

    I passed my statics course and am currently taking material stength course. The thing that has been on my head is the fact that, although I know how to do shear and bending moment diagrams... I do not know how to READ them. In other words, the diagrams don't mean anything to me. For...
  47. N

    Feynman Diagrams- Not Conserving Momentum?

    I'm reading QED. At first I thought I understood Feynman diagrams, but due to ones like these I'm not so sure anymore. In either of these diagrams, the photon "curves" around in space time. Why would it travel in anything BUT a straight line if nothing is influencing it? I liked to picture these...
  48. C

    How can you determine which bosons are used in reactions in QFT?

    Hey there, this isn't a homework / coursework question so I didn't think it should be posted in that section. I can't seem to find a source which explicitly tells you how to determine which bosons are used in reactions. I understand how to work out if a reaction is legal or not by using charge...
  49. I

    What is the correct position of u on an Argand diagram?

    Hello.I have done all the parts and just have problems with the last one. I've pasted the whole question though to include all the details which may be needed Homework Statement The complex number −2 + i is denoted by u. (i) Given that u is a root of the equation x3 − 11x − k = 0, where...
  50. R

    Ray diagrams for mirror ray tracing

    Just a check here... I'm doing some ray diagram practice for optics and I've hit a road block. Hyperphysics is stating that for a concave mirror o is usually negative due to it measured against the direction of light propagation when applied to the mirror equation (below)...
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