What is Diagram: Definition and 1000 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. P

    SR - Time dilation, space-time diagram, and radio signals

    Homework Statement P.S.: I'm not sure if it is allowed to ask multi-part questions. Two equally old sisters Alice and Barbara leave Earth simultaneously in opposite directions. The following velocities and distances have been measured in the Earth system. Alice travels with a speed of ##v_A =...
  2. C

    Create the free-body diagram for the scenario below.

    Homework Statement A Mercedes-Benz 300SL (m = 1700 kg) is parked on a road that rises 15 degrees above the horizontal. What are the magnitudes of (a) the normal force and (b) the static frictional force that the ground exerts on the tires? Important: Assume that the road is higher up to the...
  3. FritoTaco

    Venn Diagram for set operations

    Homework Statement Hi, the problem states to draw a Venn Diagram for A\cap(B-C) Homework Equations (B - C) means include all elements in the set B that are not in C. Definition from my book: Let A and B be sets. The difference of A and B, denoted by A - B, is the set containing those...
  4. K

    Tree-level diagram Moller scattering

    Homework Statement If the electron and photon were spinless, in the non-relativistic limit we can write the Lagrangian as: $$L=-\frac{1}{2}\phi_e(\Box+m_e^2)\phi_e-\frac{1}{2}A_0\Box A_0+em_eA_0\phi_e\phi_e$$ For Moller scattering $$e^-e^- \to e^-e^- $$ Draw the three tree level diagrams...
  5. I

    I Hash marks on minkowski diagram

    I'm confused as to how far apart the hash marks should be on a minkowski spacetime diagram that shows the rocket frame overlapped over the lab frame. Should the hash marks that represent space in the rocket frame be spaced apart exactly the same length as the hash marks that represent space in...
  6. Math Amateur

    MHB Diagram Chasing .... Simmons Example 2.1.2 .... .... very basic question ....

    I am reading the book: "An Introduction to Category Theory" by Harold Simmonds and am currently focused on Section 2.1: Diagram Chasing ... I need some help in order to fully understand Example 2.2.1 (b) on page 36 ... ... Example 2.1.2 reads as follows...
  7. QuarkDecay

    A Grotrian diagram of Hydrogen

    Why is it that in Grotrian diagram only the 4p->3s is not allowed, but the 4s->3p, 4p-> 3d and 4d-> 3p are allowed ? I'm following the rules of Δl=±1 and Δm=0,±1 and they give the same numbers. I also tried with Δj=0,±1 and still the same. Grotrian Diagram for Hydrogen for n=[1,4]...
  8. J

    Inverted Pole : Pole-Zero Diagram

    When analyzing a Bode plot or its transfer function the technique of "inverted poles" is sometimes used. I first became aware of this at lecture decades ago by Dr. R. David Middlebrook. While the basic method of using inverted poles in the mathematics is somewhat straightforward I don't recall...
  9. V

    Calculating Free Body Diagram Forces

    On EngineersEdge.com they have a free body diagram of a scissor lift https://www.engineersedge.com/mechanics_machines/scissor-lift.htm Can anyone explain how the Fy, Fx components are determined? What is specifically confusing to me is how Fy is opposite in direction given the system. To me...
  10. H

    A Two questions on Feynman diagram and Green's function

    First, is it suitable to solve a Green's function by one-order self-energy, since it only consider partial high order perturbation, so it's unclear that this calculation corresponding to which order perturbation. In other word, if one wants to use self-energy to get Green's function, he should...
  11. Y

    Determine the forces acting on the two rods - Free body diagram

    Homework Statement Determine the forces acting on the two rods in the figure. Explain which stresses that act on the rods and the bolts holding the rods to the brackets in point A and C. Homework Equations ∑Fx = 0 ∑Fy = 0 ∑Fz = 0...
  12. Glenn Rowe

    A Scalar-scalar scattering Feynman diagram

    I'm trying to work out the Feynman diagrams for scalar-scalar scattering using the Yukawa interaction, as given in Chapter 6 of Lahiri & Pal's A First Book of Quantum Field Theory. The interaction hamiltonian is $$\mathscr{H}_{I}=h:\overline{\psi}\psi\phi:$$ where ##\psi## is a fermion field and...
  13. José Ricardo

    Diagram of energy levels of hydrogen lines

    Homework Statement a) Draw a diagram of energy levels to explain the spectrum of lines of the hydrogen atom b) Indicate, for each photon, that its region can be emitted to the electromagnetic spectrum. c) Compare, in a graph, the energies of the orbital of the hydrogen atom with the energies of...
  14. Muthumanimaran

    How do I calculate work and heat in a PV diagram for an ideal monoatomic gas?

    Homework Statement Homework Equations Ideal gas law: $$PV=nRT$$ Workdone by the gas: For Isobaric process $$W=P(V_{2}-V_{1})$$ For Isothermal Process $$W=nRT \ln(V_{2}{/}V_{1})$$ First law: $$U=Q-W$$ The Attempt at a Solution subpart (a) is trivial, all we have to do is to substitute the...
  15. S

    Problem involving timing diagram with delays

    Homework Statement Problem statement: https://www.docdroid.net/FwEvlgl/question4-problemstatement.pdf Provided solution: https://www.docdroid.net/1MkmPKT/question4-solution.pdf Homework Equations NOT Gate OR Gate Timing Diagram Delays The Attempt at a Solution The part for x is just "normal"...
  16. F

    Engineering Why Does the Output Y Differ in the Moore Circuit Timing Diagram?

    Homework Statement Fig. 3-3 is a Moore type sequential circuit composed of a positive edge triggered D flip-flop and a combinational circuit. X is input, Y is an output, and CLK is a clock. Please show how Qo, Q1, and Y change when input X is given to this circuit at the timing diagram shown...
  17. A

    Lattice Diagram of a transmission line

    In lattice diagram, if the voltage wave is generated at Junction that there is an overhead transmission line before it, will the wave be in two directions with the same magnitude, or one in neglected ? Picture may illustrate .
  18. P

    Single Line Diagram - Power Systems

    Hey everybody, Its recurrent in Power System Analysis and Electrical Instalations the SL diagram. I need recommendations of books in which I can read about it. I've done a little research but couldn't find anything. Thats amusing, in which classes are this diagram teached for the first time...
  19. J

    Band diagram, conductivity tensor

    Hello! Does anyone have an idea of how can I obtain information from a band diagram about the directions along which the system conducts best and worst ? Thank you in advanced! :)
  20. lc99

    Why is Work Negative in PV diagram?

    Homework Statement Homework EquationsThe Attempt at a Solution Was wonder how the isotherm is negative? Is it because it is going counterclockwise (the arrows)? If this is the case, i don't see why a-c would be positive work... I'm just confused on whether work should be positive or...
  21. lc99

    PV Diagram Isothermas and Isochloric Processes

    Homework Statement Homework EquationsThe Attempt at a Solution These questions are kinda tricky for me even though i might get the right answer. I just want to know if my reasonings are correct. The answer i chose is C. For process DA, W = 0 , so delta U = Q. Q = 3/2nR(deltaT). Temp...
  22. lc99

    Moment/Shear Diagram Quick Question

    Homework Statement Homework EquationsThe Attempt at a Solution How come the pins at B and E don't affect the shear or moment diagram?
  23. Marcin H

    Semiconductors - Flat band Diagram vs Equilibrium Diagram

    Homework Statement Homework Equations Energy band diagram equations. The Attempt at a Solution This is more of a conceptual question, but this is the problem I am working on for reference. What is the difference between a flat band diagram and an equilibrium diagram? I know what they will...
  24. M

    Free body diagram of a preloaded system with a gasket

    Hello,Ive got a question and wondering if there is someone that could help me? I would really appreciate it! I am studying for an exam that I am going to have in a couple of weeks and it has been going great besides that I have been stuck on a question about tension in a preloaded system with a...
  25. T

    MHB Classicists' Favorite Epic Poets: Survey Results

    A number of classicists were asked to identify their favorite epic poets. The results are summarized below. 62 appreciate Homer, 40 appreciate Virgil, 5 appreciate Gomer, 2 appreciate Homer and Virgil and Gomer, 3 appreciate Virgil and Gomer, 20 appreciate Homer and Virgil, 42 appreciate Homer...
  26. T

    MHB Maximizing Multilingualism: Solving Venn Diagram Problems in High School

    There are a total of 103 foreign language students in a high school where they offer Spanish, French, and German. There are 29 students who take at least 2 languages at once. If there are 40 Spanish students, 42 French students, and 46 German students, how many students take all three languages...
  27. lc99

    Statics problem free body diagram

    Homework Statement Homework EquationsThe Attempt at a Solution why are my reactions at A considered wrong? I know that AC and DC are two force-members
  28. lc99

    Statics free body diagram (frames and machines)

    Homework Statement Homework Equations Trying to find the reaction forces at E. But, I am kinda confused about drawing the free body diagram for each member. I know that member AD and CB are two force members. What is wrong with my free body diagram then? The Attempt at a Solution i...
  29. ADDA

    I How to understand and visualize the Bufferfly diagram in FFTs

    Hi, I'm attempting to understand and visualize the Fast Fourier Transform algorithm. Specifically: https://en.wikipedia.org/wiki/Butterfly_diagram I've made a few slow FT examples: I could go to three dimensions, and display a log2(frame_size) series of layers, yet I do not find that...
  30. topsquark

    MHB Drawing a Rectangular Diagram with Tikz - Dan Seeks Guidance

    I thought I'd try out the tikz thing. I am trying to draw a square with the four points A, B, C, and D labeled along with functions listed by each "arrow." I based my code on the triangle that was on the tikz example. Something is obviously wrong. Heck I'd just be happy to get the square to...
  31. E

    How do write the force diagram for the following situation?

    Homework Statement We have a crate sitting on a scale that is on the surface of the Earth. We want to come up with the value of the acceleration due to gravity, ## g ##, when we take into consideration the rotation of the Earth. Homework Equations In the book, here's how they go about this...
  32. P

    I Why is there an arrow mediating a process in a Feynman diagram?

    In the following Møller scattering process, two electrons enter, exchange a photon and then leave (and if I understand this correctly, we say that both of the electrons emitted a photon). However, in this case: We have an electron scattering off a photon, but the interaction happens by an...
  33. Physics345

    Energy level Diagram relating to SP3 hybridization

    Homework Statement Experimental evidence suggests that the nitrogen atom in ammonia, NH3, has four identical orbitals in the shape of a pyramid or tetrahedron. a) Draw an energy level diagram to show the formation of these hybrid orbitals. (hint: No electron promotion is required) b) Name...
  34. H

    Understanding solar cell band diagram

    Hi everyone, I have been studying the physics of solar cells for a long time. The only thing that I can not completely understand is the physical operation of solar cell based on band diagram. Can anyone briefly explain the movements of carriers from one electrode to the another based on band...
  35. A

    Engineering Combination Circuit Diagram (resistor network simplification)

    How do I accomplish this? The goal is to redraw the diagram of the ciruit shown below, until it becomes series in the end. Given: Here’s what I did: Diagram 1 2 3 4* 5 *I apologize for flipped images. iPhone camera is tricky. Is this correct? If not, why?
  36. anemone

    MHB Finding $\theta$ in a Geometric Diagram

    Solve for $\theta$ in the diagram below.
  37. tensor0910

    Engineering Circuit diagram: find the equivalent resistance

    Homework Statement problem in title:Homework Equations 1/Rtotal = 1/r1 + 1/r2...[/B]The Attempt at a Solution [/B] I can get it down to 4 resistors...but the one's I have circled I don't know how they behave. I just need a little kick in the right direction lol. Thank you in advance!
  38. Richie Smash

    Draw a diagram showing the forces acting on a plank and find x

    Homework Statement Hello, it is me again, I recently posted about a question on moments and centre of gravity with two planks both 10 Kg in mass and 2m in lengths, uniform, situated on top of each other as shown in the picture. The question asked for the maximum length of x that the system...
  39. Humbleness

    Confirmation of a net force calculation from a diagram

    Homework Statement Calculate the net force acting on the object indicated in the following diagram. Show your work. Homework Equations cosine/sine law The Attempt at a Solution First I subtracted 10N and 8N (since they are forces acting in different directions): -8.0N (S) + 10.0N (S) = 2.0...
  40. Humbleness

    Calculating the net force acting on an object from a diagram

    Homework Statement Calculate the net force acting on the object in the following diagram: Homework Equations cosine law / sine law ONLY solving using cosine/sine laws. The Attempt at a Solution First using the cosine law to find the magnitude of the net force: c2=a2+b2-2abcosC c2=122+152-2...
  41. P

    How to Solve a Timing Diagram with Multiple Logic Gates?

    Homework Statement Draw the diagram for the following circuit given the following conditions: 1) X=Y=Z=1 2)X=Y=1, Z=0 3)X=Y=0, Z=1 4)X=1, Y=Z=0 Homework Equations The Attempt at a Solution [/B] ##W=XZ'+YZ##, ##V=Y'Z+XY## 1) W = 0 + 1 = 1 V = 0 + 1 = 1 and now I'm not sure how to get the...
  42. Meeeessttteeehh

    Diagram confirmation - force of magnetism

    Homework Statement Homework Equations None, just right hand rules. The Attempt at a Solution Can anyone verify that this looks alright? These things are so confusing! Thanks :)
  43. J

    Sequence Diagram For a Transformer

    Homework Statement I think two diagrams are wrong here. I've marked in red.[/B] Homework Equations Do you also think the 2 diagrams are wrong? I think for 1st red circle, at delta-- the a1 switch should be open whereas for second red circle at star grounded-- the a1 switch should be closed...
  44. H

    Find the work done on a monoatomic gas in this P-V diagram

    Homework Statement Homework Equations internal change = $$\frac{3}{2}n.R.(T2 - T1)$$ Work = P.ΔV The Attempt at a Solution 1) T2 = $$\frac {P2. V2 . T1 }{P1 . V1} = 1.2 * 10^3$$ 2) Q = Internal change = $$\frac{3}{2}n.R.(T2 - T1) $$ $$ = \frac{3}{2} * 1 *8.3*10^{-3}*(12*10^2 - 3*10^2) $$...
  45. S

    Interpreting Ternary Phase Diagram

    Homework Statement From the phase diagram what can be said of the porosity, mechanical strength, and density of various materials in the diagram? Homework EquationsThe Attempt at a Solution I am having trouble finding research on the general properties of quartz, feldspaar, and clay mineral...
  46. C

    I Why is the Z Boson represented triangular in this diagram?

    Hi The diagram I am referring is shown at 1:45 of this classic Symphony of Science tune Thanks, Cal
  47. J

    Power System Fault Phasor Diagram

    Homework Statement Homework Equations If load is inductive current lags voltage. If load is capacitive voltage lags current The Attempt at a Solution Current lags voltage since wire is inductive. So IF1 lags VF1 and IF2 lags VF2 But book says answer is C Why should VF1 lag IF1? This will...
  48. heavybuilder

    I A question about a Feynman Diagram

    Could somebody explain me this?: Why is the arrow of the electron-antineutrino pointed towards the W-boson and not as in the second picture upwards? This is my first post and also haven't learned too much about physics yet so please if anything is unclear hit me up.
  49. billyray

    Engineering Equivalent Single Load for Complex Delta and Y Connected Loads

    Homework Statement a) the equivalent single Δ-connected load I have uploaded circuit Homework Equations none yet The Attempt at a Solution I am not sure if the question is asking me to find the resistance of both delta and y connected loads then work out them both in parallel. After I have...
  50. N

    How is this diagram of the structure of diamond correct?

    see this diagram of the structure of diamond given in my textbook- I have read in my textbook that each carbon atom in a Diamond crystal is attached to four other carbon atoms by strong covalent bonds.But, in the diagram above I can see that some of the carbon atoms are not attached to 4...
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