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. E

    Help with analysing a strobe diagram

    http: //img ur.co m/a/cD9 aq#Bn Tg5All I need is for some explanation as to how to analyse a strobe diagram and how to extract data from it in order to answer the questions following (all in the link above without the spaces - sorry about that, but I can't post a link since my account is new)...
  2. E

    What is the Relationship Between Shear and Moment Diagrams in Simple Beams?

    Homework Statement Given the simple beam in the picture, draw the moment and shear diagram. point loads = qa distributed load : q on a length of 2a where M - is the moment, T - is the shear Homework Equations The Attempt at a Solution I draw the shear diagram, found all the ractions but I'm...
  3. D

    Feynman Diagram: Simga+ -> p + gamma?

    Feynman Diagram: Simga+ --> p + gamma? Hi, Can anyone give me some indications as to how to draw the feynman diagram for the following decay? Ʃ+ → p + \gamma Should I consider the quark composition of the sigma first? Thanks a lot.
  4. binbagsss

    Correct/accurate vector diagram.

    An aeroplane (A) can fly at 600kmh^-1 in still air. It has to fly to an airport which is SW of its current position. There is a wind of 90kmh^-1 blowing from N20W. a) Find the direction that the plane should take relative to the wind b) what is the ground speed of aeroplane. I have...
  5. F

    Relationship between funicular polygon and bending moment diagram

    Hello, I'm a civil engineering student. I learned how to contruct a funicular polygon and bending moment diagrams in two different subjects and I realized how close looking the two are, so I wondered if there was a good explanation to relate the two. I can feel it's kind of the same as the...
  6. fluidistic

    Efficiency of a cycle from a diagram

    Homework Statement Calculate the efficiency of the heat machine that is shown in the figure. Draw the corresponding Carnot cycle diagram in the S-T plane. Homework Equations \varepsilon = \frac{ \Delta W}{\Delta Q}. \Delta Q = T \Delta S The Attempt at a Solution My problem lies in...
  7. J

    Drawing and Computing Moment Diagrams by Parts: Tips and Rules

    Urgent Help Please! Just want to ask some rules/ tips in drawing MOMENT DIAGRAM BY PARTS and COMPUTING FOR THE MOMENT OF THE AREA OF THE MOMENT about a particular axis. Here's the step I typically do: 1. Get the reactions. 2. Plot the moment diagram of EVERY force. (that's why it's...
  8. B

    Creating a phase-velocity diagram with matlab

    Homework Statement I'm given a time vector and y-values of a wave. The plot looks like this: Homework Equations I have been calculating the velocity using this equation: c=\frac{ω Δx}{Δ\Phi} Where \Delta\Phi is the phase change between the phase that you calculate using the Fourier...
  9. A

    Calculating Thermodynamic Values for Different Processes

    The question is to calculate: q, w, ∆U, ∆H, ∆S for each step(A to B, B to C, C to A) I know how to calculate the values on figure 1, but, how to calculate A to B on figure 2? For A to B on figure 1, it is isothermal process, therefore, I can easy to find out the answer, but I don't know...
  10. T

    How does phase affect the Nyquist Diagram - imaginary axis, how should it look?

    Please consider http://gyazo.com/e5c5b4f7808a63e7e664440259ac3058 I agree with all notes made on that slide, but I don't actually get how they constructed the diagram from that? I understand that they line represents frequency so going to 0 to infinity means the line would travel from -0.5 to...
  11. T

    Plotting the Nyquist Diagram - Stuck

    Homework Statement http://gyazo.com/8187e80897fe361d555dbb9e5399366d Okay, quite stuck here. Spent a few hours with the notes and tried some websites, but I'm still not confident in plotting Nyquist Diagrams Homework Equations N = Z-PThe Attempt at a Solution Well, at w=0, gain is -2 and at w=...
  12. J

    Vector Diagram for Homework - Assistance and Solution

    Homework Statement Homework Equations The Attempt at a Solution Please could someone check my vector diagram could someone also help me with part (c)
  13. F

    Eye diagram telecommunications

    Homework Statement draw the eye diagram you would expect to see should a digital signal be passed through a transmission line with a bandwidth limited to three times the maximum bit rate of the digital signal. the answer is "Only f1 and f3 pass through" My question is, what about f2 ? Why...
  14. S

    Newtons third law, elevator question (free body diagram)

    Homework Statement An elevator containing 3 passengers(with a mass of 72kg 84 kg and 35 kg) has a mass combined of 1030 kg . The cable attached to the elevator exherts an upward force of 12000 N. But the friction opposing the motion of the elevator is 1400 N. a) Draw a free body diagram...
  15. B

    Free Body Diagram Help: Learn How to Draw It

    Homework Statement can anyone show me what the free body diagram of this would look like? Thankyou
  16. W

    What does a shear force diagram for a cantilever look like?

    I have the problem below, my question is what should the shear force diagram look like, I know its just a simple cantilever so does that mean the shear force diagram will be very rectangular looking?
  17. T

    Laplace Convolution proof - can someone please explain the diagram

    Homework Statement http://gyazo.com/22f5c655071e49adf3f4652e8042873b I derived the proof myself, but by arbitrary changing the t limit to infinity. I'm hoping that by understanding the diagram in the link above I will have a better idea of why I changed the limit. I currently look at it...
  18. D

    Sequential Logic Design-State Diagram for a divider

    Sequential Logic Design--State Diagram for a divider I need to design a divider so that when input C=0 it divides by 3 and when input C=1 it divides by 4 and I need to use D,T,and JK flip flops (I'm not even sure I'm phrasing this correctly). I'm just having trouble with a few concepts. I'm...
  19. S

    Feynman diagram tattoo suggestion

    Hi all After many months of contemplating, coming up with tattoo ideas, waiting a few months to see if I still like that idea, etc etc, I've settled on getting a Feynman diagram for many reasons, but having a but of trouble settling on one in particular. I've seen a few with the standard...
  20. L

    How to Produce Solid Ge and Ga from Ga2O3 and GeO2 Using Eh-pH Diagrams

    I am working with a Ge-H20 and Ga-H20 system. I am given a mixture of Ga2O3 and GeO2. I have to produce solid Ge and solid Ga. From the diagrams i understande how the reactions work to get the substances into ionic form, but from the ionic form to solid state is where I am having problems...
  21. HelloCthulhu

    Node Analysis for LM2577 Block Diagram

    Greetings Members I'm a chemistry student doing some research [this is not homework!] on boost conversion and I need help discerning the node analysis for this step-up voltage regulator. I've found pretty decent tutorials on elements such as the comparator, npn transistor, and oscillator. But...
  22. T

    How to draw pulley system diagram to find the relationship between two objects?

    Homework Statement Here is the diagram and I need to find a relationship between the acceleration in block A and the acceleration in block B. http://dl.dropbox.com/u/64325990/HW%20Pictures/datum2.PNG The Attempt at a Solution Here is my diagram, which is wrong...
  23. T

    Is my Shear and Moment Diagram for a Beam Correct?

    Homework Statement I've attached my sfd and bmd for a beam, i just need someone to tell me if its right. the 15kN on the left side is a reaction force. Homework Equations The Attempt at a Solution i've attached my working
  24. A

    Vector addition and motion diagram

    Mastering physics Knight. 2nd edition. A figure shows two dots of a motion diagram and vector \vec{V}_{1} Copy this figure and add vector \vec{V}_{2} and dot 3 if the accelration vector \vec{a} at dot 2 (a) points up and (b) points down. \vec{V}_{1} is a vertical vector pointing upward with...
  25. T

    Is the Bending Diagram Accurate for this Beam?

    Homework Statement Homework Equations moment = force x distance The Attempt at a Solution the book answer is different and doesn't show bending diagram. Can't tell what it should look like. Answer for maximum stress in book is way off: m=60 k*ft, s=17.1 in^3, stress = m/s =...
  26. T

    What Is the Role of R5 in a Full Adder Circuit?

    Ok, so I am pretty sure I understand this Full Adder diagram fairly well. But I have one question... I included the picture of course. Take a look at R5 1K. What is the purpose of this resistor? Why doesn't current always flow through the 1K R5 resistor rather than going to the 10K R6...
  27. S

    I recently saw in my physics textbook a diagram of a positron and a

    i recently saw in my physics textbook a diagram of a positron and a electron being created in pair production. The diagram showed that as soon they where created, they moved in opposite directions and then they spiralled inwards a bit. Now i think the reason why they move in opposite directions...
  28. M

    What does k mean in E-k diagram?

    In the E-k diagrams for a semiconductor material,what exactly is k? -is it just the quantized quantity in the bloch theorem :ψ(x+a)=exp(i.k.a)ψ(x) -is it the wavevector of the electron wave -does it determines the direction of the motion, i.e a given k corresponds to motion in a certain...
  29. M

    Feynman Diagram Vertices: What needs to be conserved?

    Hi, I'm taking introductory particle physics and this is related to the first couple of chapters in Griffiths. If I draw a Feynman diagram for a particular process, what conservation laws must hold at each vertex? Mainly looking at QED processs but as far as I can work out energy and momentum...
  30. T

    Bending diagram, answers don't match book

    Homework Statement Homework Equations moment = force x distanceThe Attempt at a Solution on sheet. According to the book, the max moment is 5.6 kN (at a distance of 2.4 m from point A), which was my calculation before adding the force at A (.8 kN upward) whats wrong?
  31. M

    Automotive Plotting Pressure vs Crankangle Diagram for 4-Cylinder Diesel Engine

    I want to plot a cylinder pressure vs crankangle diagram for a 4 cylinder naturally aspirated diesle engine ,do I require AVL boost for this ?and how can you plot it manually?
  32. F

    Dark energy expansion and the Hubble diagram

    I understand that a Hubble diagram is a graph of recession velocity plotted against distance for distant galaxies, and shows a linear relationship. The Hubble constant is the gradient of the graph. We are now observing extremely distant galaxies with greater than expected velocities due to...
  33. G

    Free body diagram problem assistance

    Hey, I'm having a bit of trouble with a Free Body Diagram question and I'm not sure if I'm going about it properly. The question asks; A 82kg couch is being pushed with a force of 56N at an angle of 40 degrees above the horizontal. If the coefficient of friction between the couch and...
  34. G

    Assistance in Free Body Diagram Question

    Hey, I'm having a bit of trouble with a Free Body Diagram question and I'm not sure if I'm going about it properly. The question asks; A 82kg couch is being pushed with a force of 56N at an angle of 40 degrees above the horizontal. If the coefficient of friction between the couch and...
  35. T

    Why Is the Direction of Friction on Block A to the Right?

    Homework Statement I attached a picture of the problem and I was wondering why the direction of the friction on block A is to the right. Shouldn't it be to the left because friction always opposes the direction of the acceleration (which is in this case to the right for block A)? Thanks!
  36. M

    Spacetime diagram problem (spacelike intervals)

    Homework Statement Suppose on a spacetime diagram, an event happens at x=-4, t=5 and another event happens at x=0 and t=6. If there is a frame such that the two events happen simultaneously, what would the relative speed of that frame be? Homework Equations The Attempt at a...
  37. S

    Free Body Diagram Finding Moments

    Homework Statement I have to find the forces FGB FCB AND FGH http://desmond.imageshack.us/Himg696/scaled.php?server=696&filename=img59wa.gif&res=medium P1 = 5 kN, P2 = 10 kN, JY = 21.25 kN a1 = 2 m, a2 = 1 m, a3 = 0.5 m, a4 = 1 m, a5 = 2.5 m Angle FGH makes with the horizontal is: 26.57...
  38. S

    Free Body Diagram from Space Diagram

    Homework Statement http://desmond.imageshack.us/Himg804/scaled.php?server=804&filename=img1.gif&res=medium I have to change this space diagram into a free body diagram and i am struggling Homework Equations The Attempt at a Solution I have put a reaction force in the the x...
  39. A

    Is the phase diagram for an oscilliator always clockwise?

    Is the phase diagram for an oscilliator (all sorts of oscilliations) always clockwise? If it is so, why?
  40. Rapier

    Energy and Entropy from P-V Diagram

    Homework Statement An ideal monatomic gas is taken through the above cycle where p1= 2 X 105 Pa and V1 = 5 cm3. During the cycle both the pressure and volume will change such that p2 = 2 p1 and V2 = 4 V1. a) How much work is done by the gas in going from state a to state c along path abc...
  41. L

    Moment Diagram for Boomerang shaped Beam

    Moment Diagram for "Boomerang" shaped Beam Hey y'all, I'm trying to determine a moment diagram for this "boomerang" shape (a picture is attached). Its been a long while since I have done mechanics, and I can't remember the relevant equations or how to best approach this problem. I will be...
  42. S

    Rock climber force diagram and acceleration

    A 70kg climber is dangling over the edge of an ice cliff. He is roped to a 940kg rock located 51 m from the edge. The ice is frictionless, and the climber starts to accelerate downward. a) How would you find the acceleration of the climber? Would you use the force diagrams for the rock and...
  43. S

    Rock climber force diagram and acceleration

    A 70kg climber is dangling over the edge of an ice cliff. He is roped to a 940kg rock located 51 m from the edge. The ice is frictionless, and the climber starts to accelerate downward. a) How would you find the acceleration of the climber? Would you use the force diagrams for the rock and...
  44. A

    Time-like or Space-like Events: Analyzing the Train Diagram

    Please refer to the attached diagram The train moves in the direction B-A If the events seen in the ground observer simultaneously, it should be seen at A before B in the train In special case, the difference in times between A and B according to the train observer could be equal to the...
  45. R

    What Is Vo in a Power Source Diagram Circuit?

    Circuit help Homework Statement I have a book problem that show this pic (see attachment) The problem wants me to calculate Vo and the end point of the graph and midpoint but I am not sure what Vo is. Homework Equations Vo=Va-Vb The Attempt at a Solution I think Vo is the total...
  46. J

    NLO Corrections/Feynman Diagram

    Hello, I've a question: Does anybody know a book, paper or thesis where I can find a "simple" Loop Correction of a whole process? In every book I only finde the computations of the self-energy and vertex corrections and the derivation of the counterterms, bot not a "whole" process. I don't...
  47. D

    Engineering 8051 reset pin circuit diagram

    Homework Statement Draw a circuit diagram to show how the reset pin works. Homework Equations A high on this pin will reset the device. The Attempt at a Solution In the textbook it shows the ground branching out after the switch but before the reset pin. The textbook diagram shows...
  48. O

    Component acceleration in free-body diagram

    Hi all, first post here! Homework Statement Find the x component of acceleration. Find the y component of acceleration. The mass of the particle is 2kg. Homework Equations The Attempt at a Solution I've only tried to find a_x. I thought that for finding component values you need to add...
  49. P

    Exploring the Vector Diagram of a Turning Vehicle

    Recently I began to think somehin which has led to a lot more questions. If traveling on a straight line and I were to flip a coin a stock standard right handed triangle would be made, due to the coin going up and down. What would the vector diagram look like if the vehicle was to be...
  50. S

    Force free body diagram problem on gym equipment

    I'm looking at the force required to move the weights, i have a few sketches attached on a word document with an idea of how the apparatus works. Will the force required to lift the mass increase as the player moves forward. Any help is appreciated as i am lost with this problem at the...
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