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. F

    Phase Diagram of BiMnO3: High Pressure Necessary?

    HELLO everyone.. i have read some journals and some researchers (not all but most of them) said that bismuth manganate MUST be synthesized in high pressure conditions. in other words, not in room temperature/pressure. it that true? because some of researchers also synthesized that BiMnO3 in...
  2. 0

    Engineering Circuit Diagram for lights in a building (Sound/Light Sensor + Delay)

    Homework Statement Need to design a system where the lamp (output) turns on when sound is heard and turns off after 10 seconds of no sound, but it must also be dark (light sensor).Homework Equations The Attempt at a Solution I have put a Light Sensor (that is set to let current flow when it is...
  3. J

    A couple questions regarding force and free body diagram

    Hey guy, I would like to ask a few question about force and free body diagram. First question, I conduct a compressive experiment a few day back, using compression machine to test the strength of different materials e.g., Aluminium, PVC and Ceramic. However there is one thing that I don't...
  4. K

    What does the 'n' curve in the Harris diagram for gears signify?

    Hi, I started reading about mesh stiffness and came across an interesting diagram called “Harris diagram” which represents the relationship between profile corrections and transmission error. Naturally, I ended up with few doubts, that I thought I could ask : 1. I am unable to understand the...
  5. A

    Can a shear force diagram be a function of applied load P?

    …or must it be of displacement, x? In a shear force, V (or bending moment, M) diagram, isn't it usually the shear force (or bending moment) plotted as a function of displacement, x? When someone asks to "draw the shear force and bending moment diagrams as a function of the applied load...
  6. A

    Sketching Energy Diagram w/ l=2, s=1/2 - m, j & mj values

    Homework Statement Sketch the energy diagram for a system with l = 2 and s = 1/2: before spin-orbit splitting, after spin-orbit splitting, after additional application of external magnetic B (label all m values). Homework Equations m values from -l to l (total 2l+1 values) j values...
  7. E

    Understanding Friction in Car and Trailer: Free Body Diagram Help

    Homework Statement http://postimg.org/image/vnn9m9au9/ For the car why is the friction acting towards the left. Shouldn't it be towards the right since the car is moving to the left And why is there no friction for the trailer? Homework Equations The Attempt at a Solution
  8. N

    Torque: Find Length of Moment Arm & Calculate Magnitude/Sign

    Homework Statement a) What is the length, rmr_m, of the moment arm of the force F→F_vec about point p? b) Find the torque τtau about p due to F→F_vec. Your answer should correctly express both the magnitude and sign of τ.The Attempt at a Solutiona) I'm inclined to state the answer as -rsinΘ...
  9. M

    Can this diagram make any sense? [counts of alpha decay]

    Hello all you physics folks, this is my first post, so if I screw this up, go easy on me :) Here's the problem I'm working on and that I simply can't get my head wrapped around: I have a table of 10 values of counts per second (cps) of alpha decay of Americium-241, depending on the...
  10. dwn

    Capacitor Diagram Transormations

    I am having a difficult time understanding how they're transforming this capacitor schematic...what exactly is going on here? The example states that each cap is 7pF and the final answer C(eq) = 4.308pF...but why?
  11. K

    Feynman diagram for radiative transition

    Hi, I was just trying to draw a Feynman diagram for ψ' to χ_{c} states. So we have a electromagnetic transition. I feel tempted to just have c and \bar{c} coming in and letting a γ leave from one of the legs. But that looks like an incomplete Feynman diagram to me. Maybe I have to get two...
  12. S

    Feynman diagram for pair annihilation

    Hi, I've been reading about Feynman diagrams lately and I'm trying to understand the pair annihilation diagram. The picture's here: http://en.wikipedia.org/wiki/File:Feynman_EP_Annihilation.svg I don't understand the following things about the diagram: 1. Why anti-patricles have to...
  13. maistral

    Enthelpy-concentration diagram - how to generate.

    So I wanted to create an enthalpy-concentration diagram generator in Excel using Dalton's Law and Raoult's Law (ideal stuff). The problem is with the formulation. I studied and used this .pdf file form a university in HK: http://ihome.ust.hk/~kexhu/ceng3210/221-05.pdf Seeing as it also agrees...
  14. S

    Free-Body Diagram for a Block Pushed Against a Wall

    Homework Statement A person pushes perpendicularly on a block of wood that has been placed against a wall. Draw a free body diagram and identify the reaction forces to all the forces on the block. 2. The attempt at a solution I'm not exactly sure if I've covered all the forces or if I'm...
  15. P

    Can a State Diagram Repeat a State Twice in a Sequence?

    Hi, I am designing a system to run a certain sequence when the control input is off, and then run a different sequence when the control input is on. When drawing a state diagram, for the loop where the control input is on, can the system repeat the same state twice throughout its sequence and...
  16. P

    Free Body Diagram: Explaining 3 Cord Tensions for Block C

    Homework Statement http://postimg.org/image/5h0hvdi4l/ Can someone explain why the FBD of Block C would involve three cord tensions? Homework Equations The Attempt at a Solution
  17. T

    Shear Diagram - Beam with 3 supports

    Homework Statement Draw the shear diagram for the compound supported beam. Homework Equations Statics... so sum of moments at any point or forces in any direction are 0 The Attempt at a Solution I summed the forces in the y direction, as well as the moments at A and moments at B...
  18. samjohnny

    Free body diagram and force vectors

    Homework Statement Attached, where AC=BC=2R and CD=CE=3R. I need to work out the force the cylinder exerts on the cross section (in order to work out the moment at C). So first I'm trying to work out the free body diagrams for this system. Is it as I've attached? How do I draw the tension...
  19. L

    Best way to present a phase diagram of a 4 component system

    Hullo, I've just only begun looking at phase diagrams of a 5 component alloy and wanted to know if there is a better way to study the phase diagrams of multi-component alloys rather than looking at a multitlude of binary phase diagrams calculated from the alloy system. I'm using Thermocalc...
  20. B

    What is the H-R Diagram Method for Determining the Age of a Star Cluster?

    Here's the question: The following figure is the H-R diagram of a star cluster. Use this diagram to determine the age of the cluster. The answers are multiple choice: (A) 600 thousand years (B) 6 million years (C) 60 million years (D) 600 million years (E) 6 billion years...
  21. B

    Force Diagram, Position vs Time Plot: Construct, Calculate, Sketch

    The vertical motion of an elevator is recorded and a Position vs Time plot is generated. The plot is shown in the image attached. 1. Construct a scale drawing of the associated Velocity vs Time plot complete with axis labels. 2. Calculate the average acceleration for the time interval t...
  22. A

    Free-Body Diagram for a Brick and Pillow System: Mass and Forces

    Not sure about the correct wording for this question! A brick of mass M sits on a rubber pillow of mass m . Together they are sliding to the right at constant velocity on an ice-covered parking lot. (a) Draw a free-body diagram of the brick and identify each force acting on it. (b)...
  23. Thor Shen

    QCD Feynman Diagrams: Understanding Particle Interactions

    the number stand for the index of particles (quarks and gluons) M=\bar{v}(p_2) ig_sT_{12}\gamma^\mu(12)u(p_1)\frac{-i}{p_7^2}\bar{u}(p_5) ig_sT_{56}\gamma_\mu(56)\bar{v}(p_6)\frac{-i}{m-\gamma^\mu p_{9\mu}}\bar{v}(p_3)...
  24. B

    Obtaining copy of CIE xy chromaticity diagram

    Where may an individual purchase a printed copy of the CIE xy chromaticity diagram, showing (reasonably) true colors and hues? Preferably, I would like to have a copy that shows some of the wavelengths of the monochromatic colors around the periphery of the diagram (except, of course, for the...
  25. P

    Conservation of Angular Momentum diagram

    Does the first diagram in the Wikipedia page: https://en.wikipedia.org/wiki/Coriolis_effect (that of the ball rolling on a rotating disk) properly illustrate the Coriolis effect or does it simply illustrate the conservation of angular momentum. I understand that these are two different principles.
  26. P

    Calculate Charge from Electric Field Diagram?

    Homework Statement The diagram shows the electric field lines surrounding three electric charges. Assume that q1 + q2 = -2.43 µC. A) Calculate q2. B) Calculate q1. C) Calculate q3. Homework Equations |Fe|= (k*|q1|*|q2|)/r^2 |E|=(k*|Q|)/r^2 k = 8.99*10^9 (N*m^2)/C^2...
  27. F

    Shear and bending moment diagram problem

    Homework Statement I have attached a diagram Homework Equations 14 + Va -32 + Vb -15=0?? or Vb=-15? The Attempt at a Solution The reason why I cannot attempt this problem is that I'm not sure whether it is valid that there can be a point load at Support B or whether they are...
  28. gfd43tg

    Chemical Process Flow Diagram Software

    Hello, Does anyone know of any free software that will allow me to easily create chemical process flow diagrams, that have all the symbols for various components (distillation columns, heat exchangers, etc)? Thank you
  29. L

    Diagram of relative strengths of fundamental forces

    I'm not sure if this is the right place to post- sorry if it's not. ********* Does anyone have an image or link to a website that shows the relative strengths of the strong, weak and electromagnetic forces as a function of energy? I like it as a way to explain spontaneous symmetry breaking...
  30. M

    Thermodynamics - PV Diagram of an Ideal Gas

    Thermodynamics -- PV Diagram of an Ideal Gas Homework Statement Right, I've got a PV diagram attached to make this easier to explain. The substance is an ideal gas. I need to calculate the heat absorbed along the different paths ACB, ADB and AB. The first two are easy. The red lines in the...
  31. D

    Fed up with Visio - Modify things a bit and the whole diagram breaks

    I have been using Visio for a few days now and I'm frustrated because I can't edit my UML sequence diagram a bit without the whole thing falling apart. Say I have it already nicely done and I want to add an alt box. When I shift the whole thing down, some of the activation bars and message...
  32. gfd43tg

    Iso-this, Iso-that - how the PV diagram should look

    Hello, I am having difficulties in my study of thermodynamics to keep all of these Iso's in order. What I mean is, how the PV diagram should look for isothermal, isobaric, isochoric, and adiabatic processes, as well as expressions for Q and W for all of these processes, and in general the...
  33. C

    Moment diagram with triangular load

    Homework Statement For the overhanging beam in the figure, A) draw the moment diagram indicating all critical values including the maximum moment (Value and location), and B) write the moment function, M(x), for B-C section in terms of x coordinate as shown in the figure. Homework...
  34. T

    Free Body Diagram of a incline

    Homework Statement Draw a free body diagram of the incline. Build the free body diagram of the man. Which is the force which makes the man to go up the incline? http://imagizer.imageshack.us/v2/800x600q90/46/t92m.png Homework Equations Newton's 2º Law The Attempt at a Solution...
  35. D

    Feynman diagram for pi-0 decay

    Homework Statement Hey guys, so I'm new to Feynman diagrams, and I have a few to draw but i'll start with the first one. I'm being asked to draw the following process: \pi^{0}(uu* or bb*)→\gamma +\gamma. I have to "clearly label each quark, lepton and boson, and say which fundamental force...
  36. P

    Oxygen Phase Diagram: Pressure & Liquefy 0-50 atm

    i need to know what pressure oxygen will liquefy at under various pressures but i can't find a phase diagram anywhere any link phase diagram that shows pressures 0-50 atm would be useful
  37. A

    Free-body diagram velocity vector

    My teacher gave me a solved problem to practice. There is a free-body diagram of a particle on a tilted plane. The resulting force points in the direction of the negative x-axis, aligned with the inclination of the plane.Am I the only one that thinks there could also be a velocity vector...
  38. M

    What's wrong with this diagram of magnetic field lines?

    I was looking through a book on magnetism and it had the attached diagrams of field lines and stated that the classical diagram of field lines exiting the N pole and entering the S pole is incorrect. They claim their diagram is the correct representation of the magnetic field lines. Their...
  39. C

    Can anyone help me check my free body diagram for mobile crane

    Homework Statement https://www.icloud.com/photostream/#AE5oqs3qHTNWQ;B21C49F3-02FB-4EA3-8CE5-D1E2C1FA7C49 Homework Equations The Attempt at a Solution https://www.icloud.com/photostream/#AE5oqs3qHTNWQ;A55D9431-FD6D-4884-9AFC-C4D7C8E39AF1
  40. B

    Shear and moment diagram for the beam

    Homework Statement Draw the shear and moment diagram for the beam Homework Equations ∑Fy=0 ∑M=0; ΔV=∫w(x)dx ΔM=∫V dx The Attempt at a Solution I am firstly finding the external forces as any statics problem(Ay=13.5kN upwards, By=13.5kN upwards).Then I found the equations of the...
  41. M

    Shear Force and Bending Moment Diagram

    Homework Statement This is the question that I am struggling with. http://postimg.org/image/5kb0pur3z/ I need to plot shear force and bending moment diagram of it.Homework Equations The beam is in static equilibrium so algebraic sum of forces in x and y direction equal zero. Also, moment is...
  42. H

    RFID and Block Diagram Questions, help please

    Questions are shown on the pictures. For the block diagram, I know (1) error signal (5) output (7) feedback signal What are the (2), (3), (4) and (6)? Besides, how to answer the RFID questions? Ans. 1. For example, mall card? Ans. 2. Ans. 3. Ans. 4. Ans. 5. Please help!
  43. M

    Describe and diagram the set determined by the condition

    Homework Statement 0<\left|x+3\right|<1/4 Homework Equations The Attempt at a Solution (-13/4)<x<(-11/4) and x\neq-3 Thanks in advance. This is my first post and I am unfamiliar with formatting this kind of stuff so I will work on getting better at that aspect.
  44. R

    Band Diagram of Multi-Quantum Well Laser Diode

    Homework Statement This isn't for a homework problem per say, though it is a coursework question. I'm writing a lab report on Multi-Quantum Well Laser Diodes and am trying to explain the basic semiconductor physics behind it. As such I need a diagram of the band structure. Homework...
  45. P

    Drawing E-K Diagram for Conduction and Valence Bands with Specific Parameters

    Hello, Homework Statement I'd like to draw the E-K diagram for the following within the first brillouin (-π/a≤k≤π/a): Conduction band: E(k) = E0 + Ak2 - Bk4 Valence band: E(k) = Ccos(ka) Where E0=1.48eV; C=0.3eV; B=2.78*10-31eVcm4; A=1.69*10-15eVcm2 Homework Equations The...
  46. Spinnor

    Feynman diagram for gluon exchange, time up, gluon horizontal.

    Consider the Feynman diagram below from, http://hyperphysics.phy-astr.gsu.edu/hbase/particles/expar.html where I assume time runs upwards and the gluon in the graphic runs horizontal and is labled as a green_antiblue gluon. If the gluon runs horizontal can one still label a gluon as being...
  47. MarcoAurelio

    Mass times acceleration doesn't belong to a free-body diagram, why?

    \sum\vec{F} is intended to be the net force (this is the sum of all forces acting on an object). However I have read that such sum equals to the product of the mass of the object and the acceleration that undergoes, but it resulted confusing to me that I read that \textit{m}\vec{a} doesn't...
  48. O

    Coinciding of 2F and C in ray diagram of lenses

    Hello All, Guys in my recent lecture I discussed that unlike the focal length of spherical mirrors which is half the radius of curvature, the focal length of lenses depends not only on the geometry of lenses but also on the refractive indices of the media, and that here the relation f=R/2 is...
  49. A

    What is the Shape of a Pv Diagram for an Impulse Turbine?

    We were given a project to fabricate and analyze hydroelectric power generation system. My question is what will be the shape of Pv diagram for turbine. I think it would be a point because during the process the pressure and specific volume of liquid water do not change.
  50. C

    What Is the Role of Point D in a Body Diagram and Moment Equilibrium?

    Homework Statement Homework Equations M=FA Equlibrium condition= net Fy=0 net Fx = 0 Total Moment=0 The Attempt at a Solution I need help with the body diagrem The D circle thing is what? is that a roller?
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