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. Muthumanimaran

    Metric Transformations: Explained with Diagrams

    When I study about the transformation of coordinates, especially while defining gradient, curl, divergence and other vector integral theorem in different co-ordinate system, a concept called metric is defined and it is said to used for transform these operators in different co-ordinates, it is...
  2. B

    Is the Work Done by the Piston on the Gas Counted Twice in PV Diagrams?

    Homework Statement A cylindrical container is sealed with a movable piston and contains 0.200 mol of oxygen. The initial pressure is 2.5 × 10^5 Pa and the initial temperature is 77◦C. The value of the ideal gas constant is R = 8.315J/mol · K. The oxygen, which can be approximated as an ideal...
  3. U

    What Are Feynman Diagrams and How Are They Used in Physics?

    Homework Statement (a) e- + e+ -> e- + e+ (b) e- + e- -> e- + e- c) e- + e- -> e- + e- + u+ + u- d) y -> e+ + e- e) y + y -> y + y Homework EquationsThe Attempt at a Solution Part (a)[/B] Part (b) Part (c) Part (d) Part (e) Not sure what to do with this, since usually the...
  4. D

    Momentum conservation at vertex in Feynman Diagrams

    Hey guys, I need help with conserving momentum at these vertices (this is Bhabha scattering): So in Diagram (a), the first vertext to the left. The incoming momenta are p_{1}+p_{2}. The outgoing momentum I'll call it p. So...shouldnt I have p_{1}+p_{2}=p? Furthermore, is the propagator...
  5. STEMucator

    Timing Diagrams for D Flip-Flops

    Homework Statement Complete the timing diagram for the following circuit: Homework EquationsThe Attempt at a Solution So I was doing some pre-midterm studying, and I was slightly confused with the operation of this circuit. I think part of the solution provided is incorrect, but I'm not...
  6. T

    How to Plot Constant Temperature and Pressure Lines in Excel for Thermodynamics?

    Homework Statement Hello, My thermodynamics professor gave us homework to plot 3 lines of constant temperature on a PV diagram in excel and 3 lines of constant pressure on a TV diagram. I have no clue how to do this and was wondering if someone could help me Homework Equations He gave us the...
  7. U

    Quark Scattering and Quark Flow Diagrams

    Homework Statement (a) Find energy of incoming beam that creates highest cross section (b) What are the differences in the two reactions, using quark diagrams? (c) What would the peaks of the two reactions be like? Homework EquationsThe Attempt at a Solution Part(a) [/B] Cross section is...
  8. M

    Resources for Practicing Drawing Free Body Diagrams

    I am absolutely clueless when it comes to drawing free body diagrams. I think I understand the concepts but as soon as I see an unfamiliar system I have no idea what goes where. Are there any resourcess that provide a large number of practice problems (with solutions) for drawing free body...
  9. M

    Help Drawing Free Body Diagrams?

    Homework Statement At a construction site, a small crane is raising two boxes of nails on a plank to the roof. One box has already been opened and is half full, while the other box is new. The boxes, including the nails, weigh 10kg and 20kg, respectively, and are both the same size. If the...
  10. ChrisVer

    1PI one-loop diagrams for phi^3

    I wanted to ask, about the ##6##-dimensional ##\phi ^3 ## theory... The Lagrangian is: $$ L = \frac{1}{2} (\partial \phi)^2 - c \phi - \frac{m^2}{2} \phi^2 + \frac{g}{3!} \phi^3$$ When I want to draw all the 1-loop 1PI diagrams, should I make something like these: ?
  11. M

    How many Feynman diagrams do I draw?

    I'm currently going through the interaction part of Tong's lecture notes on quantum field theory, and I'm a bit confused about how many Feynman diagrams I need to draw in order to compute the amplitude of various interaction terms. Tong presents Feynman diagrams through a series of examples. For...
  12. S

    Vector Diagrams for a Transformer

    Homework Statement Can anyone provide me a good tutorial link on drawing the vector diagrams for a transformer on load, when the load is a)Inductive b)Capacitive c)Resistive Capacitive ? Homework EquationsThe Attempt at a Solution
  13. Avatrin

    Impossible refrigerator (thermodynamics and PV diagrams)

    Homework Statement I have a rectangular PV diagram of a heat engine. Like this one: I have to show why this cannot work in reverse as a refrigerator. Homework Equations U = 0.5fnRT (U = internal energy, f = degrees of freedom, n = number of moles of gas, R = ideal gas constant, T =...
  14. P

    Understanding Airfoil Ceiling Fan Blade Velocity Diagrams

    Anyone can show me how the velocity diagram at the inlet and outlet of a airfoil section ceiling fan blade?
  15. R

    How Do You Sketch D-Orbital Splitting Diagrams for Td and D4h Symmetries?

    Homework Statement Sketch d-orbital splitting diagrams for a complex in Td symmetry and a complex in D4h symmetry. Label the orbitals as bonding, antibonding, or non-bonding Homework EquationsThe Attempt at a Solution So I know that in Td symmetry, the d-orbitals split into a lower...
  16. ChrisVer

    LaTeX LaTeX question about Feynman Diagrams

    Has anyone of you tried to work with creating Feynman Graphs in LaTeX? I tried using the feynmf package, as explained here: https://www.sharelatex.com/learn/Feynman_diagrams and used the same introductory script: \begin{fmffile*}{diagram} \begin{fmfgraph}(40,25) \fmfleft{i1,i2} \fmfright{o1,o2}...
  17. Feodalherren

    ME statics shear/moment diagrams through integration

    Homework Statement Homework Equations w=(2/3)x The Attempt at a Solution So integrating w to get V (1/3)x^2 +C Then Sum in the Y-direction should be 9-(2/3)x+18=0 Somebody tell me what in god's name is going on here. It seems like they are ignoring the 18kN force and then plugging in my...
  18. Breo

    Order of the symmetry group of Feynman Diagrams

    Hello, I am learning Feynman diagrams and I still do not understad quite well the symmetry factor idea. The equation is: $$ \frac{1}{O(G)} = \frac{M}{n!(4!)^n} $$ I was trying the next example: If I am not wrong it is O(G) = 10 taking care of the asymmetry of each pair of internal lines...
  19. M

    Shear Force Diagrams: Uses, Benefits & Calculations

    Hi there, I have created lots of shear force and bending moment diagrams for simply supported beams. I have used the maximum value on the bending mement diagram for bending and stress equations, but I have never found any real use for the shear force diagram. Yes they tell you the distribution...
  20. W

    Help Understanding Qualitative Band Diagrams for F-Chain

    Homework Statement Hi everyone, I am trying to construct qualitative band diagrams and I think I have confused myself. I am not sure on how to figure out what the electron configurations are of the orbitals when k=0. I get that at k=π/2 it is the opposite state but I can't seem to figure out...
  21. Feodalherren

    Which of these diagrams represent the same circuit?

    Homework Statement Which of these diagrams represent the same circuit? Homework EquationsThe Attempt at a Solution I thought it was A and D because it seems to me that in both cases the current is going splitting into two different paths. Also it seems to me that in A and D the potential...
  22. mesa

    Looking for Phase Diagrams for Mag-Thor alloys

    I am looking for phase diagrams for Mag-Thor alloys and would also like to get some information on how they are typically processed. Are these alloys typically made by diffusion of Th in the Mg and then thermally homogenized? Or are they usually cast? Perhaps made by some other process all...
  23. Breo

    Feynman Diagrams: Polarization question

    Hello folks, I've just started to read "An Introduction to Quantum Field Theory by Peskin and Schroeder" and at the end of 6th page I could read: "... Since H_I should conserve angular momentum, the photon to which these particles couple must have the correct polarization vector to give it...
  24. qspeechc

    Open Source for Maths Diagrams

    Hi everyone. I'm working on getting together some notes on school maths and of course I'd like to include some diagrams. The usual stuff, graphs of things like parabolas, circle geometry, etc. But I'm also skint. So I'm looking for some open source programs that can do that, and they need to be...
  25. T

    Identical particles and Feynman diagrams

    In Introduction to QFT (peskin) 4.5, he writes: The computation for M, of course, will be quite different when identical particles are present. However, I have finished reading the first part of the book and found no special treatment for identical particles. Can anybody tell me how to...
  26. F

    Writing a math textbook, program to draw diagrams?

    Hello, I am wanting to write a math/physics book or possibly a PDF online book and I'm wondering if anyone knows of any programs that exists for making pictures and drawing diagrams. I not just looking for something to make x-y graphs or 3-D graphs, I'm looking for something that designed...
  27. S

    PV diagrams for ideal gas: Finding Work Done

    Homework Statement Imagine a graph of pressure in kPa (y-axis) against volume in L (x-axis). There is a straight line moving from point A at 300kPa, 0.5L to point B at 500kPa, 1L. The false origin on this graph is 200kPa, 0L. What is the work done by the gas? Homework Equations W=pV...
  28. R

    How Do You Draw Feynman Diagrams for These Particle Reactions?

    Homework Statement For the following reactions draw Feynman diagrams, clearly labelling all the quarks, leptons and exchanged particles and stating the type of interaction involved (if more than one interaction could be involved give the most likely): (i) ##\pi^0 \to \gamma + \gamma##...
  29. A

    MHB How are Power Transmission and Reception Equations Derived?

    Hello. In the attachments are the equations for power transmission circle and power reception circle. Does anyone know how they are derived? Pr= power reception Ps=power transmission I think Wn is the power reference.
  30. Greg Bernhardt

    What is the Role and Significance of Feynman Diagrams in Quantum Physics?

    Definition/Summary Feynman diagrams are a combinatorial device for enumerating a sum of integrals of products of delta functions. Feynman diagrams are a mathematical tool with no physical significance. In particular, no single Feynman diagram is intended to represent any physical...
  31. U

    Ray diagrams, lenses and microscopes

    Hi all, I've been reading about biconvex lenses, drawing ray diagrams and real/virtual images. I'm now trying to translate this into how an image is formed in a compound infinity optics microscope. And this has raised some questions: -In an infinity optical system the object is placed at a...
  32. M

    How Does Temperature Affect Pressure in a Sealed Tank of Saturated H2O Vapor?

    4m3 rigid tank contains saturated H2O vapour at 3.5 bar. When this tank is left for a long time in a laboratory at 25.4oC, its temperatures reduces to this temperature. The thermodynamic properties of H2O is attached. Questions What would the boundary of the system be and what would the...
  33. P

    I don't understand the concept of phase diagrams?

    Let's use the material brass as an example. My problem is that I have no understanding of the concept of "phases". In the phase diagram for brass, we have α, β, γ, δ, ε, and η phases as well as the liquid phase (L). My question is, how do I interpret these phases? What is the difference...
  34. M

    On tree level Feynman diagrams

    Hi folks, I'm assured that scattering cross-sections in QFT computed at tree level correspond to cross-sections in the classical theory. For example the tree level cross-section for electron-electron scaterring in QED corresponds to scattering of classical point charges. But I'm not sure I...
  35. M

    Finding support reactions for shear and moment diagrams

    Draw the shear and moment diagrams for the beam in the figure. Clearly show all values, including the maximum shear and maximum moment and their positions on the diagrams. Assume the supports at A and C are rollers and D is a pin support. note there is a hinge at point B. I am having trouble...
  36. KiNGGeexD

    Question about phase transitions and PV, VT diagrams

    Question: A) Explain what happens when a gas is kept in a cylinder under constant pressure while being cooled. Assume that constant pressure is less than critical pressure. Draw PT and VT diagrams for this? B) Describe and explain what is seen when a strong transparent container of constant...
  37. D

    MHB Block diagrams from state matrices

    How does one construct a block diagram from the state space representation? Consider the state space: \begin{align} \dot{\mathbf{x}} &= \begin{pmatrix} 0 & 1\\ 0 & 0 \end{pmatrix} \mathbf{x}(t) + \begin{pmatrix} 0\\ 1 \end{pmatrix}\mathbf{u}(t)\\ y(t) &= x_1(t) \end{align}
  38. S

    How to Draw Force Diagrams for Suspended Objects and Equilibrium Situations

    Homework Statement An object with a mass of 300 kg is suspended between two cables which sag at an angle of 40ᴼ below horizontal, on either side. Draw a free-body diagram. While driving in your car, you notice that the string holding the rosary to your rear-view mirror makes an angle...
  39. S

    How to Draw a Force Diagram for an Object Suspended by Strings?

    Homework Statement An object with a mass of 5 kg is suspended between 2 strings which sags at an angle of 52° Below horizontal on either sides. Draw a force diagram. 2. Attempt
  40. Einj

    Penguin diagrams and CP violation

    Hi everyone. I have been studying CP violation in kaon systems. I would like to know is someone can explain why, to leading order, strong penguin diagrams (i.e. involving a gluon) only contribute to the K\to (\pi\pi)_{I=0} amplitude, while the isospin 2 amplitude is given by the electro-weak...
  41. L

    MHB Drawing Arrow Diagrams & Explaining Domain, Codomain & Range

    Hi Folks, Have a task , but no idea how to resolve. Will appreciate any help. Consider the function f: {5,6,7} →{A,B,C} given by f(5)=A, f(6)=C, and f(7)=B Draw its arrow diagram and state its domain, codomain and range. Is it (i) onto and (ii) one-to-one ? Explain. Does it have...
  42. ThomasMagnus

    MO Diagrams for Heteronuclear Diatomic Molecules

    I'm trying to understand how to draw MO diagram for molecules such as CO, HF, and NO. I am finding so much conflicting information on how to order the σ and pi boxes in the diagram. Now, I know that the more electronegative atom's orbitals are going to be lower in energy than the less...
  43. D

    Block diagrams to transfer functions

    Homework Statement I am trying to write a block diagram as a transfer function. Homework Equations The Attempt at a Solution Let ##G = \frac{1}{s}##, ##H = \frac{K}{Js + a}##, and ##L= K_f##. Then wouldn't the closed loop transfer function be written as $$...
  44. H

    Weight in an elevator? Free body diagrams

    A 60kg student is standing on a scale in an elevator that measures weight in Newtons. Calculate the reading on the scale if the elevator is accelerating down at 4 m/s^2...when the elevator is accelerating up at 4 m/s^2... and in free fall. Not sure if my work/answer is correct accelerating...
  45. Spinnor

    Feynman diagrams with odd number of vertices.

    If we scatter unpolarized electrons off each other and we calculate the amplitude for electrons to scatter into final states and one photon to be emitted do we get destructive interference because the photon can be emitted by either electron? Is one photon emission suppressed in favor of an even...
  46. T

    Shear force and bending moment diagrams question

    Homework Statement So in my notes we have the following example: So I decided to try to solve it another way, this time I flipped the figure and here is my attempt: I got the correct moment but then the signs on my shear is flipped. Does anyone know why?
  47. S

    A question about Feynman diagrams

    For a 2nd order electron-positron scattering, the following diagrams are possible: http://www.quantumdiaries.org/wp-content/uploads/2010/02/eepp-1024x228.png My question is: What is the meaning of the right diagram - is a photon created and annihilated instantaneously? how is this possible?
  48. D

    Drawing a Feynman Diagram: Lagrangian Basics

    I need help :( How can I draw a Feynman Diagram, starting with a Lagrangian?
  49. S

    Space Time Diagrams? And lorentz Transformation?

    I am starting to learn Special and General realitivity by reading through Bernard F. Schutz's book "A First Course in General Realitivity". However I can't seem to grasp the relationship between two reference frames as compared with a Space-Time diagram. I understand the geometry of the diagrams...
  50. B

    Are the S' Axes Nonorthogonal in a Spacetime Diagram?

    Homework Statement Show that the S' axes, x' and ct', are nonorthogonal in a spacetime diagram. Assume that t = t' = 0 when x = x' = 0. (Hint: use the fact that the ct' axis is the world line of the origin of S' to show that the ct' axis is inclined with respect to the ct' axis. Next, note...
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