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. T

    Can a 3x3 Upper Triangular Matrix Be Symmetric?

    Homework Statement Give an example of the matrix: 3x3 upper triangular symmetric matrix Homework Equations The Attempt at a Solution I know what an upper triangular matrix and what a symmetric matrix looks like. But what happens when they put it together? Is the symmetry in the...
  2. M

    Motion Diagram Mystery: Green Arrows Left or Right?

    In the green box in the paint doc it says " The motion diagram shows that the particle's acceleration points to the right... Umm what are they reffering to because it looks to me like the green arrows are pointing to the left...
  3. O

    Explanation of band diagram of MOSFET

    Why the voltage drop across the insulator is linear in the band diagram of a MOSFET??
  4. 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.
  5. S

    Static Equilibrium Pulley and free body diagram

    Homework Statement Attached is the picture of the problem and my free body diagram. The system is in equilibrium. Homework Equations Fy = 0 Fx = 0 The Attempt at a Solution I'm having trouble solving the two equations that I arrive with... I use +x to the right, and +y up...
  6. D

    What software was used to plot this diagram of morse potential

    Hi all, I recently saw a very nice diagram of the morse potential on wikipedia I am curious if anyone has any suggestions as to how this diagram was made? What software package was used? In particular how the actual morse curve was plotted.
  7. S

    A single line diagram for PV system for a distribution system

    Hi guys, I am looking for a real life single line diagram (containing generator, transmission line, distribution system) containing a PV system in a distribution level. The single line should contain all the parameters (for example generator voltage, and impedance for transmission...
  8. M

    How to Simplify a Block Diagram to Obtain Y/R?

    I am having trouble trying to obtain Y/R from the block diagram below: the only thing i understand so far is that the bottom right loop is a feedback loop and can be simplified to 1/(s+a1). i know b1s can be obtained from the right loop, but i am having trouble getting to that point. i know it...
  9. X

    Phase diagram H2O saturation pressure

    Homework Statement Suppose 2 kg of H2O at 200 C and 300 kPa are contained in a weighted piston cylinder assembly. As a result of heating at constant pressure, the temperature of the H2O increases to 400 C. Determine the change in volume, the change in internal energy, and the change in...
  10. H

    Lagrangian equation from this free body diagram

    Homework Statement Here's the free body diagram with variables. I am looking for the lagrangian mechanics equation. M is mass of the bottom wheel. m is the mass of the top wheel. R is the radius of the bottom wheel. r is the radius of the top wheel. θ_{1} is the angle from vertical of...
  11. O

    Addition of Vectors using a scale diagram

    Homework Statement Add each set of vectors by using the scale diagram C=28km 20 degrees north of east; D=34 km 30 degrees west of north Homework Equations The Attempt at a Solution Attempted to create a triangle with a right angle; then Pythagorean
  12. phosgene

    Ray tracing diagram for white light moving through glass

    Homework Statement White light is incident on a sheet of glass as shown below. Complete the ray tracing diagram. Homework Equations n1(sinx)=n2(siny), where n = the refractive index of the medium. The Attempt at a Solution The ray on the bottom is hitting the glass at 90 degree angles...
  13. S

    Creating Spacetime Diagrams with Math Software

    Is there any software or program which can plot spacetime diagrams which includes worldlines, hyperbolas, etc. given some inputs? If not. Why is there none when spacetime diagrams are very useful?
  14. C

    T-v diagram at constant volume

    Homework Statement 5 kg of a mixture of saturated liquid-vapor water is in a container of fixed volume 2,5 m3. Initially the temperature is 75 ºC and then the water is heated. a) Find the temperature at which the water is completely vaporized. b) Draw the temperature-specific volume diagram...
  15. N

    How Can BPSK Be Modified to Increase Bit Rate by 5 Times?

    Homework Statement Design a constellation diagram that supports transmission of complex symbols where for the same baud rate, the transmission bit rate of symbols on your constellation should be 5 times the transmission bit rate of Binary Phase Shift Keying (BPSK) symbols. The Attempt...
  16. D

    Leaning Column Free Body Diagram

    This is a self-study homework problem. I am trying to verify the "falling column physics" associated with leaning forward with our center of mass in front of our feet. Homework Statement Describe the free body diagram for a column (tree, pencil, person) leaning from vertical. Assume there...
  17. G

    Engineering Parallel RLC circuit phasor diagram

    I am having difficulties with phasor diagram for Is and Vs of an parallel RLC circuit. I have calculated all values but not sure how to use phasors. Impedance Z has angle +65°. Current Isupply +30° and Vsupply is Z*Is= Vs at angle 95° But with parrallel network V is the reference so I guess it...
  18. M

    Reading a P-V Diagram for heat in/out and work in/out

    Homework Statement Predict whether heat is lost or gained by a gas, and whether work is done by the gas or the gas does work on its surroundings, given a P-V diagram. Homework Equations The Attempt at a Solution I'm trying to understand how to read a P-V diagram and am wondering...
  19. R

    Is there a representation diagram for fermions like the 8 fold way for mesons?

    I was wondering if there was something similar to the 8 fold way representation used on mesons for the fermions?
  20. T

    Monkey force diagram and tension problem

    1. Homework Statement A 5kg monkey hangs initially at rest from two vines, A and B, as shown in the JPEG attached. Each of the vines is 10m long and has negligible mass. a) Draw a force diagram labeling all forces acting on the monkey. (do not resolve the forces into components, indicate...
  21. E

    Interpreting a signal block diagram to form transfer funciton

    Homework Statement Given the following block diagram. Calculate the transfer function H(z) and find \theta (f=\frac{f_{s}}{6}) Homework Equations H(z)=\frac{Y(z)}{X(z)} The Attempt at a Solution Ok So I know i need to find my y(k) output equation from this. I can then rearange the...
  22. A

    Understanding Projectile Motion: Free Body Diagram of a Tipcat

    Homework Statement Place a small wooden stick over the edge of a desk. Hit the end of the stick overhanging the table so that it flies away. Draw a free body diagram during the impact and after it flies away. Homework Equations Torque, Impulse, Angular momentum, Projectile motion, Moment...
  23. Z

    PV Diagram of a monoatomic gas and diatomic gas

    I'm reviewing a question on a previous test but am having trouble finding the solution for it. We were told to draw a PV diagram of a monoatomic ideal gas that undergoes an isothermal compression from Va to Vb and then is allowed to expand adiabatically and quasistatically back to Va again...
  24. K

    Understanding a schematic diagram

    Homework Statement I'm an electrical engineering student and in this exercise I'm asked to calculate (and simulate in MicroCap or Multism) voltage gain and output resistance. The problem is that I don't understand how the voltage source (s) is/are connected according to this schematic...
  25. M

    Conjugate beam: help with clarification of given diagram, not with my work

    Homework Statement See problem number 2 as attached. The Attempt at a Solution I found the reactions and shear and moment diagrams for the original beam. I also drew the conjugate beam and loaded it with M/EI. My only question for this problem is what the 4EI and EI under the beam...
  26. S

    PV Diagram Problem (ideal efficiency vs actual efficiency)

    Homework Statement The PV diagram below (I will describe it) shows a cycle for 4.87moels of an ideal gas. The path ab is along an isothermal line. Pressure is in atm and volume in m3 Point a: (.08, 6) Point b: (.24,2) Point c: (.08, 2) Find the ideal and the actual efficiency of...
  27. N

    Does a symmetry of Lagrangian reserve in each Feynman diagram?

    Please teach me this: Does a symmetry of Lagrangian be reserved in each Feynman diagram of perturbative QFT,because even Ward Identity still deduces from U(1) symmetry that we consider each diagram has?. By the way, does effective action reserve the symmetry that Lagrangian has?. Thank...
  28. H

    Heavy sterile neutrino decay into Z bosons. (Feynman Diagram)

    Hello there, I am looking at the decays of Heavy sterile neutrinos in the their mass states to Z bosons. Using the feynman rules, how would I go about calculating the decay amplitude. I have only ever seen cases where the Z boson is a propagator. Would my expression look something like this...
  29. A

    Identifying vertices of a planar diagram

    Hi all, I'm having trouble understanding what 'identifying vertices' means for a planar model of a surface. This is in the context of trying to classify a closed, connected surface to see whether it is homeomorphic to the sphere, or connected sums of tori, or connected sums of projective...
  30. R

    What is a free body diagram and how can it be used to analyze forces on a body?

    Hi i just wanted to know if anyone can help me located a system diagram with atleast 5+ forces acting on it? P.S. the diagram it self should be in rest position.
  31. S

    Band diagram of intrinsic semiconductors

    How to sketch the band diagram of intrinsic semiconductors including the fermi level with the electric field present verses distance? Its not a homework question.
  32. D

    Why does the beam's deflection diagram smile when subjected to load?

    This is not a homework question.. just share your thoughts please...
  33. 7

    How Does Static Friction Affect Bicycle Acceleration?

    Homework Statement Consider a biker riding on level ground as shown. She wants to have the maximum forward acceleration possible, which means experiencing the maximum horizontal force without her wheels slipping. Draw the free body diagram for the bike accelerating forward. Homework...
  34. D

    Mass in circular motion. Draw Diagram and find/explain variables.

    Homework Statement A ball of mass m is held by a string of length L and swung in a horizontal circle. The string makes an angle θ with the vertical (as shown). a. Draw a diagram clearly labeling all forces on the mass. b. Find T, the amount of time that it takes for the ball to complete...
  35. G

    Distribution Diagram for speciation of Cr(VI)

    Hi, this is some Geochemistry homework. We were not really given much information on how to approach this problem. I treated it as a diprotic acid H2CrO4, and made an alpha plot using the equations given using the constants K only for the fully protonated and deprotonated species. I'm not...
  36. S

    Campbell diagram and is its applicaion

    Please again a fundamental question. Can anyone explain what is a Campbell diagram and its application? IS it a plot/comparison between exciting frequencies and natural frequencies mainly illustrating when responance will occur? Please help and elaborate above
  37. Z

    Is E constant in simple Gaussian diagram?

    Homework Statement If you have a simple Gaussian diagram of spherical shape, and arrows pointing out from the centre indicating [E] how do you know if [E] is constant or if it varies? Is it because the arrows are of slightly different lengths? (Though all eminating from the centre and...
  38. S

    What is k in E-k Diagrams of Semiconductors?

    In the E-k diagrams for a semiconductor material,what exactly is k? I have read that it is a propagation constant,a wave vector. But does movement in the semiconductor material represent corresponding changes in k? I mean to ask if changes in k represent the physical movement in the...
  39. X

    Deriving an equation through a free body diagram

    Homework Statement Use a Free body diagram to show that :Tanθ=static friction, on an incline plane Homework Equations FF/FN= coeficiant of friction The Attempt at a Solution I know I must get an angle to have a tan of the Force of friction and a Normal force, but I don't...
  40. L

    Given the diagram, what is the tension in each string?

    Homework Statement Given this diagram and the masses involved, what is the Tension in each string. All masses are 1kg. Diagram provided Sorry, the angle for T2 is 10° Homework Equations The Attempt at a Solution I really don't know where to start.
  41. S

    How can torque be used to solve for tension in an extended free body diagram?

    Homework Statement I need help with this: http://img716.imageshack.us/img716/3262/unledewk.jpg I know that I need to create an extended free body diagram and I understand how to get all the equations from the diagram. BUT I don't know what to do when it comes time to use torque and find...
  42. A

    Free Body Diagram Of a Situation

    Homework Statement Hello people, First of all, this is my first day in this forum and this post is my very first post. So, I am extremely sorry if I violate any rules here. I have to solve a problem involving frictions. I will solve the problem myself; I just need help with drawing the Free...
  43. P

    Quantitative centripetal force apparatus-free body diagram

    hi there i was looking at this video on utube and have two questions regarding it. at 1:02. the person starts to rotate the apparatus. my first question is that HOW CAN U DRAW THE FREE BODY DIAGRAM OF THE MASS ATTACH TO THE SPRING while its rotating? i know there is the mg downward from...
  44. S

    Torque and Forces Question (With a Diagram)

    Homework Statement https://www.physicsforums.com/attachment.php?attachmentid=40303&stc=1&d=1319521828 An iron ball of mass 220kg is suspended from the end of a rigid steel girder. The girder has a mass of 180kg and a length of 2.4m. The girder is pivoted to a rigid upright. A steel wire is...
  45. N

    Calculating Vertical Forces in a Cantilever Beam Setup

    Homework Statement This is not a homework problem, but something i can't figure out how to calculate. Basically I have what is similar to a cantilever beam setup with an extension. what i need to figure out is what the vertical forces are at the two points(triangles on the attached paint...
  46. A

    What should be the free body diagram?

    Homework Statement The Question gives some data, and a figure to find out the acceleration. In the arrangement shown (refer attachment) shown, M1=20kg, M2=30Kg, floor is smooth and friction between two blocks: μ(s) = 0.6, μ(k) = 0.4. F= 400N What are the forces acting on the two blocks...
  47. Z

    Plotting Complex Numbers on an Argand Diagram

    Homework Statement Plot 3e^(-i5∏/3) on an Argand Diagram The Attempt at a Solution Re(e^iθ) = cosθ = cos(-5∏/3) = 1/2 Im(e^iθ) = sinθ = sin(-5∏/3) = √3 / 2 So I'd go along the x-axis to 1/2 and then upwards in the y-direction to √3 / 2 and plot the point there. Is this the...
  48. C

    Phase diagram contradiction: why does vapor exist?

    When you learn about phase diagrams of pure substances, you learn that the liquid and gas phases are in equilibrium only along the line separating the pure liquid and pure gas regions. But if you have a sample of liquid in a closed container with some empty space in it, that empty space...
  49. R

    Simple trigonometry / geometry question. Diagram included

    Hey all, BACKGROUND: (please note that knowledge of this is not necessary): I'm currently writing a javascript application using vectors (with jquery and raphaeljs) that enables me to rotate custom text (using font.js file, not normal fonts). However, due to a bug in the new version of raphael...
  50. DaveC426913

    Creating My Own Venn Diagram: A Weekend Project

    A couple of trips to the store this weekend and I have decided to make my own Venn diagram.
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