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. M

    Phase Diagram Question: How to Solve with Ease | No Template Needed

    THIS HOMEWORK WAS PLACED INCORRECTLY IN ANOTHER FORUM, SO THERE IS NO TEMPLATE (AND NO EFFORT) I have no idea how to tackle this. Please show me how to do these problems.
  2. U

    'Special' fourth order Feynman diagram Compton Scattering - Why is it allowed?

    I thought the fundamental electromagnetic vertex is Why is the following diagram below allowed? The 'special' feynman diagram for compton scattering ##e^- + \gamma \rightarrow e^- + \gamma## is
  3. R

    Need help reading a phase diagram for a lipid DMPC

    Homework Statement Homework Equations None required? The Attempt at a Solution I understand that Id would be a disordered phase, Io an ordered phase and the other two are regions where 2 phases exist at the same time possible due to cholestrol. I am assuming so means solid ordered. But...
  4. V

    Resistance and Voltage, switch diagram

    Homework Statement [/B] Homework Equations V=IRThe Attempt at a Solution I said: A>D=F>B=C>G>H=E I assumed higher resistance would lead to higher readings. However here are the answers: H=E>C=B>G>D>F>A Can someone explain to me why this is? As you can see H=E which combined gives a total...
  5. A

    Help with Bending Moment Diagram for Structure

    Homework Statement Hi I need help with drawing a bending moment diagram for this structure. All joints are rigid and it's fixed to the ground. I'm really struggling with this. I initially started with the horizontal beam (statically indeterminate) and found that the moments at the ends were...
  6. P

    What is a Eye Diagram - create it in Python

    I am self learning Python and developing Communication signals concept by coding programs. But I am not sure how to develop Eye Diagram code in Python - cause I do not know the formulas / concept to do so - say I have a signal bits like - 1 1 1 0 0 0 1 1 So what formulas of concept I should...
  7. K

    How to Draw a T-s Diagram for a Cogeneration System?

    Homework Statement . Can anybody help me to draw a T-s diagram Homework EquationsThe Attempt at a Solution Ive found out all the temperatures and entropy's but the videos I have watched don't help [/B] [/B]
  8. P

    Velocity diagram for a rotating blade

    Homework Statement http://postimg.org/image/5o9kcuj57/ I do not understand what the vectors W and V represent Homework EquationsThe Attempt at a Solution I know U is the tip speed velocity but I don't know about the other two
  9. K

    Free body diagram of a beam construction

    Homework Statement Beams AC and BD are light (no mass) and they're conjoined at B. Points A and D are fixed but frictionless. The radius of the wheel is R and the weight hanging on the pulley has the mass m. Homework Equations Fx=0 Fy=0 M=0 The Attempt at a Solution I'm stuck at the very...
  10. B

    Is the Feynman diagram in The Big Bang Theory episode correct?

    Dear community! I watched The Big Bang Theory and watched this episode. If you click on it you would get to a homepage - if you scroll down you would get to a section called Episode Questions -> Physics Bowl. According to the newspapers The Big Bang Theory have an employee who is scientist...
  11. nate crosby

    Free Body Diagram -- forces on a structure over a balcony wall

    Hi, I am trying to work out the forces involved at the contact points in a design of a structure over a balcony wall. I have drawn up the cross section of the situation equilibrium, with a tolerance. I want to find out what forces will be acting on the structure and the balcony wall when a...
  12. A

    Bending moment Diagram for fixed-fixed beam

    Homework Statement There is a beam, say length L, with a force F UP on the left built-in support and a CLOCKWISE moment. The right side has a force, F, DOWN and a COUNTERCLOCKWISE moment i.e F up, cw moment -------------------------------------------------------------F down, ccw moment...
  13. D

    Is this Free-Body Diagram Correct?

    Homework Statement I have to draw a free body diagram representing the motion of an object @ a given point in time. This diagram is for section 1. It's of a 1.25 kg cart with a 0.6 kg can attached to it with a pulley-system. When the can drops, the cart begins to move. In section one, when the...
  14. P

    How Do Block Diagram Simplifications Reflect Underlying Equations?

    Homework Statement I am trying to understand the simplification between these two block diagrams Homework EquationsThe Attempt at a Solution I understand the 2s+1/s has been moved past the summing junction, resulting in the 2s. But I don't understand where the s/2s+1 block comes from
  15. M

    Timing diagram of flip flop and d-latch

    Tried using the template, had to put pictures because this concerns a diagram question! sorry guys! 1. Homework Statement Consider the circuit shown in the figure below which consists of a positive edge triggered flipflop with selective load capability (identified as MICK) and a level...
  16. S

    What causes drag on a stationary car?

    See attached photographs. For the car problem, I think the drag should be smaller than the forward acceleration but I'm not sure. For the Rocket question, I am pretty sure I am correct but I'm not sure why. The drag and the weight would both be in the down position.
  17. julianwitkowski

    Diagram for Charge Directions-Electron Path-Magnetic Fields

    Homework Statement A magnetic field of 0.0200 T [up] is created in a region. a) Find the initial magnetic force on an electron initially moving at 5.00 E+6 m/s [N] in the field. b) What is the radius of the circular path? c) Make a sketch showing the path of the electron. Electron Charge =...
  18. D

    How to arrange/draw circuit diagram from fixed resistances

    How to arrange/draw circuit diagram from fixed resistances to have a specific total resistance? (BTW, I am new to PF so I am just starting to know how to do things here hihi)Sample problem: 2Ω,3Ω,4Ω,5Ω,10Ω - arrange the 5 resistances to form a diagram that will have a total resistance of 17Ω.I...
  19. twoski

    Entity Relationship Diagram Modifications

    Homework Statement Assume you are given the entity Person. This entity has 3 attributes: Name, Name of child, Name of parent. Now, assume you want to modify your design of ”People” database above to include additional information about types of people such as sex, and people who are parents...
  20. J

    Process flow diagram for production of hydrogen

    In the following process flow diagram for the production of hydrogen, why is the amine column placed after 2 heat exchangers?
  21. D

    Feynman Diagram for phi^4 theory (path integral)

    Homework Statement Hey guys! So basically in the question I'm given the action S=\int d^{d}x \left[ \frac{1}{2}\partial_{\mu}\phi\partial_{\nu}\phi\eta^{\mu\nu} - \frac{m^{2}}{2}\phi^{2} -\frac{\lambda}{4!}\phi^{4}\right]. I have use the feynman rules to calculate the tree level diagram with...
  22. T

    Free Body Diagram of Car on Mountain

    If a car is on top of a mountain moving with an initial velocity, will it only forces acting on it be the normal force counteracted by the force due to gravity?
  23. L

    Converting logic diagram to only NAND gates

    Homework Statement How is he able to just swap the inverter for a NAND gate? Doesn't a NAND gate require two things? See the text on the right for his explanation [/B] Homework EquationsThe Attempt at a Solution
  24. M

    QED Feynmann Diagram Momentum Int Integral Calc

    Homework Statement Write the momentum space integral representation for the following diagram in QED Homework EquationsThe Attempt at a Solution [/B]...
  25. Y

    Phase space diagram for a spring in simple harmonic motion

    Homework Statement A mass m = 750 g is connected to a spring with spring constant k = 1.5 N/m. At t = 0 the mass is set into simple harmonic motion (no damping) with the initial conditions represented by the point P in the phase space diagram at the right. **(This phase space diagram has...
  26. J

    MHB UML class diagram for a system.

    Hi, I need to make a UML class diagram for a hotel billing system then implement it in Java. I'm quite new to UML so was just wondering a few things. The scenario is: 3 different types of customer - corporate, group and individual Corporate customers are local companies employees with a...
  27. L

    Equivalent Diagram- How does counting paths let us eyeball?

    All the youtube links are time stamped 1. Homework Statement Homework EquationsThe Attempt at a Solution I wrote it out the operator expressions each by hand and got the same result but I don't understand how he is able to just eyeball it. I'm trying to develop some intuition. a. To start...
  28. T

    Transfer Function of Block Diagram

    Homework Statement The block diagram of a PM DC servo motor with current loop feedback is shown below: If Ki is adjusted such that J(Ki+R)2 >> 4KTKbL, show that the transfer function may be approximated by G(s) = (1/Kb) / (τms+1)(τes+1), where τm = J(R+Ki) / KTKb τe = L / (R+Ki)The...
  29. Quarlep

    Relative velocities In Space-Time Diagram

    How can we show one dimensional relative parallel velocities in space time diagram ? (One dimensional means there's only pozitive and negaive values of speed)
  30. U

    How Do You Balance Forces in a Bicycle Free Body Diagram?

    Homework Statement Bicycle with a rider applying weight to on pedal. Draw as free bodies in equilibrium. There are different situations. Homework Equations N/A The Attempt at a Solution So I am working on part a). 1. I believe it is only referring to just the pedal, chain, and the two...
  31. JasonHathaway

    JK Master-Slave Flip-Flop timing diagram

    Homework Statement Draw the output Q of the JK Master-Slave Flip-Flop Homework Equations Master works at the rising edge, while and the Slave works at the falling edge. The Attempt at a Solution http://s13.postimg.org/j5ldpmw9i/20150109_095656.jpg
  32. J

    Sketches for t=0.5, t=1, and t=1.25:for t=0.5for t=1for t=1.25

    Homework Statement The question is to sketch for values of t = 0, t =0.25, t = 0.5, t=1 and t = 1.25 for the wave equation Ytt = Yxx in the infinite domain with initial conditions y(x,0) = f(x) = \begin{cases} 1 & \text{if } 0 ≤ x ≤ 1 \\ & 0 (otherwise) \end{cases} Yt(x,0) = 0 Homework...
  33. B

    Kirchhoff's and Ohm's law circuit diagram issue.

    Homework Statement The question requires viewing the circuit diagram to start. An image is attached, it can also be viewed here (http://imgur.com/6Q0DCQ9). The questions are: a) Calculate the equivalent resistance ##R_T## of the 4 ##\parallel## 8 ohm combination. b) Redraw the circuit with...
  34. B

    2 very difficult light ray diagram questions -- help please

    Homework Statement Hi please help me with these 2 ray diagrams... the questions is as stated in the attachment..i have no idea where to start drawing and whatever i have drawn is wrong for both qns.. thanks a lot experts! Homework EquationsThe Attempt at a Solution
  35. Cosmophile

    (Kleppner/Kolenkow) Missing Diagram?

    Hello! I'm working my way through K&K (First Edition) and have encountered a slight dilemma. On page 26, I believe there may be a missing diagram. There is a reference made to a diagram which reads: Using the angle Δθ defined in the sketch, \left |\Delta A \right |=2A sin \frac{\Delta...
  36. B

    Adding Another Time Axis to Space-Time Diagram

    Can we add another time axis to Einsteins space time diagram? Since space and time are one thing they can be represented by one axis. The other axis can be a cosmological constant average axis. By adding this extra term can mass and energy be measured by a time scale relative to the expanding...
  37. bcrowell

    Necessary conditions for a Penrose diagram?

    What conditions are necessary if it's to be possible to make a Penrose diagram for a 3+1-dimensional spacetime? It seems that rotational symmetry is not necessary, since people draw Penrose diagrams for Kerr black holes. If you don't have rotational symmetry, how do you know what 2-surface is...
  38. C

    Penrose Diagram for the Kerr Black Hole

    Hey Guys, so i was reading Hawking&Ellis a bit and still encounter always problems with the Penrose-Diagrams. Looking at the Penrose-Diagram for the rotating Kerr-Black hole (just one illustrating picture at the end) i come up the following question: Why are there TWO regions III and III ? In...
  39. P

    Impedance matching and Smith diagram.

    May I pose a question concerning impedance matching and Smith diagrams?
  40. A

    PV Diagram Problem: Calculate Net Heat & Work Done

    Homework Statement A reversible engine contains 0.20 mol of ideal monatomic gas, initially at 600 K and confined to 2.0 L. The gas undergoes the following cycle: Isothermal expansion to 4.0 L. Isovolumic cooling to 300 K. Isothermal compression to 2.0 L. Isovolumic heating to 600 K...
  41. L

    How Does Moving the Summation Block Affect the Equation in Control Systems?

    Hi there, I am struggling to understand how moving the summation (with H3) to before G1 will cause H3 to have to be divided by G1. I tried writing down how the equations would work to make sense of it but I still can't see how it works out. Please can someone explain this to me? Thanks, Laura...
  42. kiwimia

    Help on a free body diagram and equation

    1. Relevant information This is a two-block-system on top of each other to the right side of a wall, both attached with springs that are also attached to the wall. A force is applied on the bottom block to the right direction, frictions occurred on both bottoms of the two blocks. Here is the...
  43. M

    Compound Microscope, Ray Diagram Mistakes.

    I noticed that the ray diagram for the "how the compound microscope works" and "how the telescope works" is wrong in my government sanctioned physics textbook(and countless other books and websites!) The diagram printed was this- Name: Physics Standard XI Printed by: Maharastra State Board of...
  44. W

    Hourglass Weight: How Sand Weight Changes

    How does an hourglass's weight change while sand is dripping in it? (better be in a diagram)
  45. K

    Question based on folllowing diagram (TDA audio amp):

    guys for the critical frequency for low pass is it the following: 1/2pi* 2.2*10^(-6)*100k?
  46. P

    Symmetry factor of a Wick diagram

    Hello ! In the book Quantum Field for mathematician, there is this Wick diagram as an example to understand how to compute the symmetry factor (I am sorry, I draw it with paint...) This is about a hermitian field interacting with a complex field. The book says it has a symmetry factor of 2...
  47. F

    How can I calculate h from this diagram

    Water flows in the horizontal pipe shown in Fig. 13-6. At A the area is and the speed of the water is At B the area is 16.0 cm2. The fluid in the manometer is mercury, which has a density of What is the manometer reading h? My attempt: I used A1V1 = A2V2 to find the speed at B which is 3.125...
  48. P

    Does Normal Force change with new Force diagram?

    All degrees are measured from the positive x-axis. FG = Force of gravity FN = Normal force FT = Force of tension Problem: A skier is being pulled up a 15° incline by a rope. I'm solving for FT. The only forces acting on the skier are FG, FN, and FT. Attempt at a solution: Initially, my...
  49. R

    Control systems block diagram reduction

    Homework Statement Hi I am having trouble simplifying the attached diagram with respect to the return summing blockHomework EquationsThe Attempt at a Solution there shouldn't be any superposition since there is only one input signal, in the attached file I've simplified A to Be: G3/(G2-G2G3G4)...
  50. P

    What is tan θ in this diagram?

    < Moderator Note -- Thread moved from the technical math forums (that's why the HH Template is not shown) > It's supposed to be a simple problem. But I can't for the life of me figure out how to go about it. I managed to find out cos θ using the cosine rule, but it is a very long expression and...
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