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. B

    Draw a T-S Diagram: Help & Solutions

    The only thing i need help with is drawing the T-S diagram. I want to try and solve the problem myself. If anyone could help it would be greatly appreciated
  2. A

    Plotting Minkowski diagram for 2 simultaneous accelerating

    Homework Statement two objects are at rest in an inertial reference frame. Two objects accelerate simultaneously in the same direction until reaching half the velocity of light and then halt simultaneously. The two objects are initially connected by a thread just long enough to cover the...
  3. J

    Draw a circuit diagram to measure resistance of wire

    Homework Statement Homework EquationsThe Attempt at a Solution This is how I drew it (in pencil) , but there should be a rheostat connected in series with the power supply, why?i can already calculate the resistance straight away by V/I
  4. DiracPool

    What is the true nature of time and space for a photon?

    I had some questions about how to understand the Minkowski diagram better: 1) One thing that I hear characterizes a light ray or a photon is that it "experiences no time." That is, it's time dilation is so extreme that at the "null lines" or light cone lines at the 45 degree mark, the...
  5. toboldlygo

    Instantaneous Velocity from Strobe Diagram

    Hi guys! My first post here. I've been frequenting Physics Forums and have found a wealth of information, and I'm hoping I can get some specific help about this concept. Thanks! Homework Statement "Cart A and B move along a horizontal track. The top-view strobe diagram below shows the...
  6. W

    Free body diagram of pin support and cable

    Homework Statement A) Draw a free body B) determine the tension in rope A and the reactions in B. Homework Equations [/B] Standard equilibrium equations The Attempt at a Solution My free body shows a collinear force T through the rope, the given downward force at 5ft, and then a Bx and By...
  7. C

    Is there a simpler way to solve this Venn diagram algebra problem?

    Homework Statement I solved the problem myself but i have a question about the algebra Homework Equations n(A ∪ B ∪ C) = n(A) + n(B) + n(C) -n(A ∩ B) -n(A ∩ C) -n(B ∩ C) + A ∩ (B ∩ C) = n(A ∪ B) -n(A ∩ C) -n(B ∩ C) + A ∩ (B ∩ C) The Attempt at a Solution I knew i needed...
  8. L

    Complex numbers - I'm sure this is an easy - Argand diagram

    Homework Statement OABC is a square on an Argand diagram. O Represents 0, A represents -4 + 2i, B Represents z, C represents w and D is the point where the diagonals of the square meet. (There are two possible squares that meet this criteria) Find the complex number represented by C and D in...
  9. E

    Labeling Diagrams: Expert Tips for Accurate Physics Models

    I'm kinda new to physics and i made this model with sketch up and i need help labeling the diagram. any ideas? as accurate you guys can be it will be of great help. just for the locking mechanism labels.
  10. A

    Statics: four crates, four springs, free body diagram

    Homework Statement In figure (a), four identical crates weighing 2,000 lb each are stacked one on top of another, and in figure (b) a simple model for determining the deformation of the stack of crates is shown. In this model, each spring has the same stiffness k = 4,500 lb/in. and the forces...
  11. A

    Equilibrium of a Collar and Pulley System with Spring - Free Body Diagram

    Homework Statement A collar with a pulley slides on a frictionless vertical bar GH. A string A B C D is wrapped around, where portion AB of the string is horizontal. A spring with 2.5 lb/in. stiffness is placed between the collar and point H. The spring has 7 in. unstreched length and 5 in...
  12. M

    Solving for Electric Potential Difference in Square diagram

    Homework Statement I've attached a url with a picture of the problem setup and diagram https://instagram.com/p/7nYNXTscre/ Homework Equations I used the equation V = KΣiqi/ri to solve for potential at A and B The Attempt at a Solution For Va I used K((Q/d)+ (2Q/(d^2+d^2)^.5)) I just plugged...
  13. S

    MHB Venn Diagram Problem: Tipping Survey Results

    The hotel conducted a survey. It found that of the 2560 guests who were surveyed, 1785 tip the wait staff 1219 tip the luggage handlers 831 tip the maids 275 tip only the maids and the luggage handlers 700 tip only the wait staff and the maids 755 only tip the wait staff and the luggage handlers...
  14. C

    Cuts of a Feynman diagram and the massless limit

    Consider a ##j## point all massive leg one loop polygonal Feynman diagram ##P## representing some scattering process cut on a particular mass channel ##s_i##. Invoking the relevant Feynman rules and proceeding with the integration via dimensional regularisation for example gives me an expression...
  15. mioei

    My Physics teacher presented a wrong diagram? (Explanation↓)

    My Physics teacher told us to use a = g x sinθ during a lab trying to find how close we could calculate gravity using an inclined plane, a moving cart and a motion sensor to measure acceleration. He also drew a diagram next to the formula. I just wanted to confirm that his diagram was wrong, or...
  16. JasonHathaway

    Solving Homework: Find Final State, Mass, Work & P-v Diagram

    Homework Statement A tank has a saturated liquid at 0.2 MPa. An amount of heat is transferred until the pressure in the tank became 0.1 MPa. If the volume of the tank 1 m3. Determine: 1- The final state of the water 2- The mass of the vapor in the tank 3- The work 4- The process on P-v...
  17. R

    Penrose Diagram for Multi-Blackhole Solutions: Reference

    Can anybody recommend a reference (paper/textbook) where I can look up the Penrose diagram for multi-black hole spacetimes or multi-center solutions? Appreciate.
  18. B

    Need Help with Understanding And Changing a Circuit Diagram

    I am by NO means an electrical engineering student, so please explain it to me like I'm 5. My friend sent me a circuit diagram and I don't know how it works/what it means, but basically I want to know if it's possible to charge 2 batteries at once instead of 1, using the same mechanism. If so...
  19. Mr Davis 97

    Force diagram of a suction cup

    I am a little confused about how to construct a force diagram for a suction cup, like a plunger, as it is stuck to a wall. First, I know that the cup is not accelerating, so the gravitational force pulling down on the cup has to be met with an equal but opposite force vector pointing up...
  20. DiracPool

    Acceleration in a space time diagram

    I was trying to draw a space-time diagram representing two objects traveling through spacetime, me and the planet Earth. At first I thought I would just draw two straight lines heading upwards some distance, x, apart, seeing as my position relative to the center of the Earth would not be...
  21. P

    I Why energy band diagram is flat?

    if in a solid there arent no states with same energy then why energy band vs location diagram is flat?
  22. A

    Extracting a Feynman diagram from a lagrangian?

    Hi everyone, sorry if this is not the right place to post that question but I'm new to this forum, i'll delete if necessary. I am currently trying to learn QFT from Matthew Schwartz's "Quantum field theory and the standard model", quite clear during the first chapters, but i have been...
  23. L

    Free body diagram drawing for a two force members on machine

    Homework Statement When a force of 2 lb is applied to the handles of the brad squeezer, it pulls in the smooth rod AB. Determine the force P exerted on each of the smooth brads at C and D Homework Equations ##\sum F_x=0## ##\sum M=0## ##\sum F_y=0## The Attempt at a Solution I drew a free...
  24. KaseyKC

    Thermal Kinetic Physics Question involving PV diagram

    Homework Statement I'm stuck on question A4 that is linked below. University won't provide me with any solutions. I have a TKP resit exam next month. Homework Equations dU=dQ-PdV The Attempt at a Solution Internal energy is equal to heat flow plus the work done. Work done is 0 because it's...
  25. monsteruf

    Free body diagram for all forces

    Homework Statement Two ropes are connected to a steel cable that supports a hanging weight as shown in the figure. Draw a free-body diagram showing all of the forces acting at the knot that connects the two ropes to the steel cable. Draw the force vectors with their tails at the knot. The...
  26. E

    Free body diagram of a wheel driven by a motor

    Neglecting drag, I'm trying to understand how a wheel driven by a motor on a level surface rolls without sliding and experiences constant velocity. I'm trying to construct a free-body diagram. The wheel has a weight and a normal force acting on it in the vertical directions. The sum of...
  27. Feodalherren

    Solid Mechanics - Stress-Strain diagram - absorbed energy

    Homework Statement 1.The maximum energy (per unit volume) that can be absorbed by the steel alloy without sustaining permanent deformation is _______ lb/in^2 1.4. The maximum energy (per unit volume) that can be absorbed bythe steel prior to fracturing is _______ kip/in^2. . Homework...
  28. T

    What is the Sign Convention for Moments in Free Body Diagrams?

    Homework Statement In the picture, I am confused with the sign of the moments. When taking moments about D, the moment due to the 100N is taken as positive, but when they take moments about B, its negative. Homework EquationsThe Attempt at a Solution Shouldn't both cases be negative since in...
  29. D

    What direction does friction point in a diagram of a spring?

    Homework Statement A mass is at rest on a spring on an inclined plane. Which way would I draw the force of friction on a force diagram? Homework Equations Fnet=0 F=-kx The Attempt at a Solution It could point either up the incline, or down the incline. [/B]
  30. P

    Can symmetry help me solve this circuit? Circuit diagram question

    Homework Statement I am trying to find the current across Rg. I do not understand the answer provided Homework EquationsThe Attempt at a Solution Am I supposed to add the two voltage sources and then continue?
  31. C

    Twin Paradox - Question on Space Time Diagram Analysis Resolution

    I started a thread previously (https://www.physicsforums.com/threads/time-dilation-happens-on-moving-frame-but-which-one.814622/) around this concept but it got closed by one of the staff after helpfully pointing me to...
  32. 1

    Feynman Diagram Help: Decay of ∆+ to n + π+

    Homework Statement :[/B] For the decay of the ∆+ → n + π+, sketch an appropriate quark-level Feynman diagram. State which interaction is responsible for this decay. 3. The Attempt at a Solution This is more of a question to see if I'm doing it right more than anything. The first Feynman...
  33. Jimster41

    Trouble understanding 2-side BH Penrose diagram

    I've seen this a few times now, but it's not quite sinking in? How are the left and right sides of that 2-side BH Penrose diagram disconnected but share the BH? I keep thinking you could go around the black hole. Trying to think of a metaphor that correctly captures my confusion. Picturing a...
  34. J

    How do I reduce the outer loop in the first question with 3 inputs?

    Homework Statement I have got 2 questions like this and I'm struggling any help would be much appreciated please. Thanks Homework EquationsThe Attempt at a Solution
  35. DevonZA

    Determine the total current in the attached diagram

    Hope this is posted in the right place: Determine the total current in the attached diagram R parallel = 1/9.7 + 1/43 = 0.366^-1 = 2.98ohms R series = 4.3 + 7.4 = 11.7ohms R total = 2.98+11.7=14.68ohms I=V/R = 30/14.68 = 2.04A The answer given is 4.67A, what am I doing wrong? Thanks, Devon
  36. D

    MHB Free Body Diagram Explained: Why is Right FBD Upward?

    Can you explain why the free body diagram of each members are as shown? I kind of understand why the FBD of the member on the left is drawn as shown. But the FBD on the right is confusing, Why does it have a component in Y (upward) direction? thanks!
  37. J

    Solving Venn Diagram Problems: Spinach, Broccoli, and Carrot Preferences"

    Homework Statement Based of a survey from 500 people come up with this: 130 people prefer spinach 100 people prefer broccoli 50 people prefer carrot 10 people prefer spinach and broccoli 12 people prefer spinach and carrot 5 people prefer broccoli and carrot 15 people prefer all 3 of them A...
  38. D

    (Vector statics) Effect of a pulley on free body diagram?

    For example, a 1-m bar fixed to a wall holding a weight of 100 N, like this: How will the free body diagram of the second case different from the first?
  39. R

    Interpretation of Bremsstrahlung diagram

    This is what we have been given in class: I'm a little confused as the electron seems to emit two gamma rays? I understand that the process can't occur if there isn't interaction with a nucleus due to conservation of momentum. Please could someone confirm that the top gamma is the initial...
  40. N

    Sketching Nyquist Diagrams for Transfer Functions: A Helpful Guide"

    Homework Statement I need to be able to sketch Nyquist diagrams for transfer functions. I spent a lot of time but I cannot wrap my head around the idea of mapping the GH(jw) in the complex plane. Let's consider the following example for this question: GH(s) = \frac{4} {s(s+2)^2} 2. The attempt...
  41. G

    Finding Impulse Response from Block Diagram

    Homework Statement Where $$v = y - bu$$ It's given that the transfer function is $$h(t) = b u(t) + v(t) = b \delta(t) + e^{at}b \mu(t)$$ Homework EquationsThe Attempt at a Solution I can't seem to figure out how the impulse response above was found. I understand that the impulse response is y...
  42. C

    Free Body Diagram of a ice skater?

    Homework Statement In our science class, we had to draw a free body diagram of an ice skater. The ice skater pushes against a force plate and that results in her skating in the other direction. (Newton's third law of motion). We have to use Newton's three law of motions to explain this...
  43. S

    Electric Potential Difference diagram

    Homework Statement Point charges q and Q are positioned as shown. If q= +1.0 nC, Q = -2.0 nC, a = 3.0m, and b = 4.0m, what is the electric potential difference, Va - Vb? **The question with the diagram is also attached ** Homework Equations V = ke (q/r) The Attempt at a Solution V =...
  44. C

    Proton Collision Feynman Diagram

    Supposed to represent a relativistic proton colliding with a stationary proton, leading to changes in the momentum of both and the production of a neutral pion. The pion then decays into two photons. No clue if this is right. I've never drawn anything much more complicated than...
  45. thegirl

    Why do neutrons and neutrinos have arrows in Feynman diagrams?

    The arrows in a Feynman diagram represent electric current. right? If this is the case then why do neutrons and neutrinos have arrows. How do they have an electric current?
  46. T

    Help with free body diagram for a pendulum

    Homework Statement I want to sum the forces perpendicular to the pendulum and sum the moments about the pendulums center of gravity. Homework EquationsThe Attempt at a Solution P\sin \theta - mg\cos \theta - N\cos \theta = -m\ddot x\cos \theta + ml\ddot \theta -Pl\sin \theta - Nl\cos \theta +...
  47. hdp12

    Internal Force Diagram for Rigid Body and Distributed Load

    I'm working on a homework problem for Statics and I'm stuck. Could someone please help?Problem: Draw the internal force (N,V,M) diagrams and include all significant figures Here is all of my work: Resulting F from W1: W(x) = W1 ∴ F2=∫02b W1dx eq (1) ⇒ F2 = W1⋅2b x1 = (F1)-1 ∫02b W1dx =...
  48. M

    Help with VHDL to transition state diagram

    Homework Statement VHDL code: http://i.imgur.com/UZrK1ky.pngHomework Equations B2 = B7 * A1 B3 = (B9 * B2) + (B1(1) * /B1(0) * /A1 B6 = B9 + /A1 B8 = B2 + (B9 * /A1) + (/B5 * (A1 + B7)) If Clock = 1 and rising edge on A2 then we reset B4, B5, B7 to 0. Else B4 = B3 = (B9 * B2) + (B1(1) * /B1(0)...
  49. R

    Diagram That Contains All The Different Kind Of Physics?

    I am looking for some kind of a diagram, general or analytic, that shows all the different kind of Physics "Departments"-"Studies" or what you would call them, like Quantum Physics, Physics of Sound Waves, or something like that. I know it is a very general question but anything you know of...
  50. G

    NEWB - LED Tail light wiring diagram

    Hello. So I have a pair of LED tail lights that are operated by 2 modules. One is for Dimming, Braking and strobe function, and the other is for Turn signal blinking. One tail light is wired to the other through a wire harness and then the wires for dimming and brake function come out the other...
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