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. jdawg

    Shear and Moment Diagram Equations

    Homework Statement Write the shear and moment diagram equations and graph them. Homework EquationsThe Attempt at a Solution I attached my attempted solution in a pdf (I know the last section of the moment diagram is supposed to be parabolic, I accidentally drew a straight line instead). I...
  2. M

    A How Does the Bifurcation Diagram in AUTO Represent Mathematical Concepts?

    Hi PF I am given the ODE ##\ddot{\theta} +q\sin\theta+\mu\cos\theta=0##, where I introduce ##x_1 = \theta## and ##x_2=\dot{\theta}## to yield$$ \dot{x_2}=-q\sin x_1-\mu\cos x_1\\ x_2=\dot{x_1} $$ subject to ##x_2(0)=x_2(1)=0## and ##\int_0^1\sin x_1\, d t = 0##. I then plug this system into...
  3. Divy Jain

    I Interactive Minkowski Diagram Tool

    I've made a Interative Minkowski Diagram Tool, http://divykjain.github.io/IMD You can add events, connect events and add world lines. Lorentz transformation for moving frames also present. I've added support for frame velocities equal or greater than light speeds(but the animations are a mess...
  4. S

    Carnot Engine cycle on PV Diagram

    I posted this in the engineer / comp science thread, but I've had no one reply or help. I really could use some guidance and I don't know where else to post. Homework Statement I am tasked to create a PV Diagram of a Carnot Engine Cycle. I must find pressure, volume, Q, W, ΔU, and ΔS on all...
  5. M

    Control systems: Simplifying block diagram

    Homework Statement How to show a block diagram can be simplified to a standard first order form for the diagram shown in the image attached and the question is shown in 1.a Homework Equations Standard first order form K/(1+tD) where K gain and t is time constant The Attempt at a Solution...
  6. S

    SN diagram vs. Cycle Frequency

    Hi, What is the effect of the load cycle frequency on the SN curve (Wöhler curve)? Especially when the frequency matches the natural frequency of the component/material? Instinctively, I would think that at the natural frequency the number of load cycles until fracture is lower than at any...
  7. S

    Plotting Carnot Engine Cycle on PV Diagram

    Homework Statement I am tasked to create a PV Diagram of a Carnot Engine Cycle. I must find pressure, volume, Q, W, ΔU, and ΔS on all four points. This is what has been given to me by my teacher: a to b : Isothermal b to c: Adiabatic c to d: Isothermal d to a: Adiabatic TC = 300 K TH = 1700 K...
  8. N

    Thermodynamics: Gradient of Adiabat in PV diagram

    Homework Statement The Equation of State and the expression for the entropy for a sample of salt water is given by: V = V_{0}(1 + \beta(T - T_{0}) - \gamma(P - P_{0})) S = S_{0} + C_{v}ln(T - T_{0}) + \frac{\beta}{\gamma}(V - V_{0}) where the subscript 0 denotes a reference state, the...
  9. E

    B Gyroscopic precession force diagram

    Hi, I've been learning about gyroscopic precession recently and I feel like I get it. I understand that when the flywheel of a gyroscope is spinning its angular moment plus the angular moment created by the torque from the force of gravity makes it turn. But I were thinking about the forces in a...
  10. H

    Force diagram of a spinning mass tied to a string

    Homework Statement In an effort to rev up his class, Mr. H does a demonstration with a bucket of water tied to a 1.3-meter long string. The bucket and water have a mass of 1.8 kg. Mr. H whirls the bucket in a vertical circle such that it has a speed of 3.9 m/s at the top of the loop and 6.4 m/s...
  11. N

    Free Body Diagram of 3-Bar Linkage. Splitting the force?

    Homework Statement Hi, please see the attached file. I am trying to find the force as illustrated in the diagram. Homework Equations [/B] The Attempt at a Solution I've found the force for the 4deg beam and therefore the horizontal beam however I am unsure how to take into account the...
  12. sweet springs

    B Is Lorentz contraction explained by space time diagram ?

    Is there a way to explain Lorentz contraction on space-time diagrams ? I cannot find a way by myself. Your teaching will be appreciated.
  13. V

    Drawing the quark flow diagram for proton-pion interaction

    Homework Statement I am given the following interaction, $$\pi^-+p\rightarrow \pi^++\pi^-+n,$$ and asked to draw the Feynman (quark flow diagram). Homework Equations None; just baryon number conservation, quark flavor conservation, etc. The Attempt at a Solution First, as baryon number and...
  14. J

    Free Body Diagram lab report -- General Question

    < Mentor Note -- thread moved to HH from the technical forums to use a scpecific schoolwork problem to illustrate the general concept of torque in a FBD > I'm writing up a lab report for Physics class and I have to draw FBDs for torque being applied to a ruler resting on a pivot point. I've...
  15. G

    RAM memory diagram using decoders

    Homework Statement Draw a block diagram of 32kx8 bit RAM memory using decoders DEC 3/8 and memory components 8kx8 bit. 2. The attempt at a solution First we find the number of memory components: N=\frac{32kx8}{8kx8}=\frac{2^{18}}{2^{16}}=4. The number of decoders is 32/8+1=5 There are 4...
  16. J

    Which is the correct diagram (synchronous alternator varying PF)

    Hi, Sorry this question may be silly but I have an exam on 11th Feb on machines, maths and electronics. Book had two diagrams for alternator external characteristics. But then which one of 2 diagrams is right? Book says: For zero pf loads, it is seen V(t) = E(f) +/- I(a)X(s) It's minus for...
  17. Safinaz

    I Dominant Feynman diagram for ##b \to s ~l^+ l^−##

    Hi all, It's written in QFT books, see for instance George_W._S. book "Flavor Physics and the TeV Scale" that the following Feynman diagram (1) is the dominant Feynman diagram for ## b \to s ~l^+l^− ## decay. Actually I compare this diagram via another possible diagram (2) Both (1) and...
  18. C

    I Identifying gluon in Feynman diagram

    Consider the process in the picture below where an ##r \bar r## state goes to an ##r \bar r## state through mediation of a gluon. The gluon may carry the colour anticolour combination ##r \bar r##. I'm just wondering... 1) Can we have a gluon with the colour assignments just ##r \bar r##? If...
  19. S

    Electric Field diagram question

    http://imgur.com/a/Hg23p 1. Homework Statement In each of the figures below some electric field lines are drawn. But in most cases, there are mistakes. For each drawing, select which of the above rules are broken or if the diagram is essentially correct. http://imgur.com/a/Hg23p Homework...
  20. L

    Calculate area of PV diagram. Two isotherms, two isobars

    Homework Statement Everything is in attached file. Given the PV diagram with P2, P1, V2, V1. Homework Equations PV=nRT W=nRT*ln(Vf/Vi) The Attempt at a Solution Attempt in attached file is very organized. I showed 2 of my peers and they are getting the same answer as well. Anybody have any...
  21. Safinaz

    A Calculation of ## b \to s~ l^+l^− ## penguin diagram

    I'd like to calculate the matrix element amplitude for## b→s l^+l^−## penguin diagram mediated by Z boson or the photon , like : These calculations are made of course from many time ago, so if anyone has a good reference for such calculations, because it's my first trail in a penguin loop ...
  22. Vitani11

    Draw a diagram, specify intercepts

    Homework Statement Draw a diagram of the orbit and specify its x and y intercepts. Describe its shape. r = 2bsin(wt)x̂ + bcos(wt)ŷ Homework EquationsThe Attempt at a Solution Heres my picture. Aren't the intercepts just 2b for x and b for y?
  23. M

    A block diagram reduction [sign error]

    I try to solve a block diagram reduction example but when I did the operations, sign of one operation is incorrect. I tried to understand why it is so? Would somebody like to help me. (1) First I carry the feedback into the parallel line. (2) I add +1/G1H1 in the parallel line because I...
  24. nothing909

    Pin configuration & Internal block diagram of an optocoupler

    Homework Statement In that pin configuration, what does the triangle and rectangle in the middle represent?
  25. franktherabbit

    Engineering Transformation of resistors in a circuit

    Homework Statement From the circuit diagram ( http://postimg.org/image/lldnr7mf7/ ) calculate the net charge flown through the capacitor 2. Homework Equations 3. The Attempt at a Solution [/B] I actually don't need to solve the full problem as i understand how, what i have trouble with is the...
  26. M

    Can I Simplify a Block Diagram by Making Multiple G5 Blocks?

    I would like to ask why cannot I think G5 in series with G3(G4+G6G7) and then after muliplying them why I cannot think of G5*G3(G4+G6G7) in parallel to G2 so sum G2 and G5*G3(G4+G6G7) ? Thank you.
  27. Navier-Stokes

    How do I understand this gear diagram?

    I'm finding it a bit too confusing to imagine how it actually would look like. But once I understand that, I'd easily be able to solve the problem! link: http://i.imgur.com/DApJzGx.jpg The attempt at a solution: I'm thinking that the dotted line might be the place where the gears mesh...
  28. R

    High school circuit diagram question

    Hi all. I got 3 Ohms in this question (top current = bottom current hence equivalent series resistance of top 2 and bottom 2 resistors must also be equal), but is that really the right answer? There is no option for 3 Ohms so I am beginning to doubt myself.
  29. Muhammad Khalid Khan

    Total displacement using vector diagram

    A car is driven eastward for a distance of 50 miles, then northward for 30 miles, and then in a direction 30 degree east of north for 25 miles. Draw the vector diagram and determine the total displacement of the car from its starting point. The relevant equations I used here are: i) rx= ax +...
  30. Cocoleia

    How to go from micro operations to a logic diagram

    Homework Statement I am preparing for my final and I am stuck on the following question Homework EquationsThe Attempt at a Solution My best guess would be to make some kind of next state table, but I don't understand the relationship between xT1, yT2, yT3 and any kind of table.
  31. TheAnt

    B How to measure the area of a Clapeyron diagram (pV diagram)?

    The question is in the title. However my mathematical ability is limited as I am a high school student. Thank you in advance
  32. T

    Hertzsprung-Russell Diagram question

    Homework Statement From first principles show that the relationship between the luminosity, size and surface temperature of a star can be expressed as: $$ \frac{l}{l_0}=(\frac{R}{R_0})^2(\frac{T}{T_0})^4 $$Homework Equations $$L_0$$= Luminosity of sun $$R_0$$=radius of sun $$T_0$$=surface...
  33. runningman19

    Solve Txy Diagram Problem: Methanol & Water @ 25°C

    Homework Statement Hi Everyone, I am having trouble grasping the concept of Raoult's law, partial pressures etc. One problem in specific is: A system contains 3 moles of methanol and 7 moles of water at 25 degrees celsius. The temperature is raised until there is 40 mol% methanol in the gas...
  34. whatphysics

    Need help in step response circuit diagram

    This isn't a homework question! I posted the question for context purpose. So I understand that at t>0 the switch moves to b. Hence the first circuit diagram (pictured) I understand. However for the 2nd circuit diagram (picture 2) when asked to transform to s domain. Why does this answer...
  35. PhanicKnight

    Diagram of electric potential difference in plate capacitor

    Homework Statement Plate capacitor is filled with two dielectrics of constants 3 and 4, and with a metal as seen in the picture. If the el. field in the first dielectric is 30 kV/cm, do: a) diagram of el. potential difference with calculated characteristic values using point C as a...
  36. G

    What is a feed through term in block diagram?

    I`m reading some paper about control engeneering. But I don`t know what is feed through term exactly. Is it a connection between some point in one circuit?
  37. 1

    I I don't understand this Feynman Diagram

    Question: Draw the lowest-order Feynman diagrams for the e+e- --> W+W-process The answer gives three diagrams. I understand the first two, but the third makes no sense to me. Here it is: So this is a t-channel Feynman diagram. As far as I can tell regarding how these types of Feynman diagrams...
  38. A

    How Does Gas Behavior on a PV Diagram Indicate Changes in Internal Energy?

    Homework Statement figure: http://www.chegg.com/homework-help/questions-and-answers/dot-figure-represents-initial-state-gas-isotherm-dot-divides-p-v-diagram-regions-1-2-follo-q5905441 The dot in Figure (b) represents the initial state of a gas, and the isotherm through the dot divides the p-V...
  39. F

    Carnot's Cycle Diagram: Exploring Its Components

    Consider a Carnot's cycle diagram for an ideal gas. It will resemble a square. How do we know which side represents isothermal expansion/compression, which side shows work done by the gas or on the gas, adiabatic expansion/compression and which side represents the heat was added/exhausted?
  40. P

    What would the Free Body Diagram of a Trebuchet look like?

    What would the Free Body Diagram of a Trebuchet look like (FOR THE SYSTEM)? Would it be comparable to a see saw/ teeter totter? I am aware of some of the forces at play, but I feel there is some I am missing.
  41. Safinaz

    I How to Calculate the Self Energy Amplitude of a Sunset Diagram?

    Hi all, I'd like to calculate the self energy amplitude of the following sunset diagram (take the middle for instance ) can anyone help me in distributing the momentum on the internal propagators ? Best
  42. C

    Shape of bending moment diagram

    Homework Statement in this question , I'm asked to draw the bending moment diagram and shear force diagram Homework EquationsThe Attempt at a Solution I don't have the ans for this question , can somoene check thruough my shape of graph . I'm not confident with it . [/B]
  43. PhysicsNewbie321

    Why wouldn't the bulb light up in this circuit diagram?

    Why is this wrong? Does the (v) need to be on the right side? Is this right? Voltage symbol V is measured in |_____ joules (J)| <-- Voltage is a measure of the amount ______<--- volts| done on a unit _____<---?
  44. C

    Shear Force Diagram: 45N at 0.6m from B vs. 0.5m from D - Homework Question

    Homework Statement In this question , the 45N is acting at 0.6m from B ... why the author put the 45N forces at D in the shear force diagram ? Is it wrong ? Homework EquationsThe Attempt at a Solution IMO , the 45N should be put at 0.5m from D . Correct me if i am wrong
  45. S

    Physical interpretation of free body force diagram

    Homework Statement Free body force diagram question, where I have selected the best answer but the diagram doesn't ring completely true (see diagram uploaded). I think mathematically the diagram is sufficient but it doesn't properly represent the situation. Do you agree? Homework EquationsThe...
  46. C

    Shear force diagram and bending moment diagram

    Homework Statement theoretically, bending moment should ends at bending moment = 0 , am i right ? Homework EquationsThe Attempt at a Solution Here's my sketch of SFD and BMD ,my bending moment doesn't return to 0 , which part of my working is wrong ... to find bending moment (M) , i get M...
  47. L

    Need resources for ER diagram and SQL

    I have a gut feeling that I will retake a test about these subjects. Do you know good resources about creating ER diagram and relational model for database (sql database primarily) Sometimes even creating a correct ER Diagram (chen notation) feels difficult and confusing. These type of...
  48. F

    B Cant get Venn diagram to agree with Demorgan's Law

    I was trying to solve a problem about calculating the probability of failures of a communications link with several nodes, and figured I need to use Demorgan's law since it would involve non mutually exclusive events. So I tried to go back to the basics to make sure I understand the axioms of...
  49. Alexanddros81

    I How to draw figures and diagrams?

    Hi! I have been doing some reading over the past 5 months on spacecraft dynamics and physics mechanics -dynamics . I want to create figures and diagrams such as those found in Orbital Mechanics by Curtis, Vector Mechanics for Engineers by Beer and University P|hysics by Young. Which software...
  50. E

    Free body diagram of two different objects

    I was wondering if anyone can provide feedback on my free body diagram of two objects acting on each other. The question is asking for two separate free body diagrams. A force is applied to object 1, and object 1 pushes against object 2. Object 1 is on wheels and object 2 is in contact with the...
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