What is Diagrams: Definition and 689 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. J

    Free Body Diagrams & 3rd law pair forces.

    Homework Statement I have 2 questions from a practice test paper that I can't do (I missed the lessons) - I've attached them, the other questions I did fine. They should be quite basic but I'm not sure if what I'm doing is right (only done physics for 2 weeks). If anyone could correct my...
  2. S

    Special Relatvity & Spacetime Diagrams

    Homework Statement Hansel and Gretel both make a journey from Earth to the Gingerbread Planet, 1 light year away. Hansel travels at a constant speed of 0.3c there and back. Gretel leaves Earth at the same time, but travels at a constant acceleration (in the Earth's frame), and chooses this...
  3. marcus

    Braid Advance by Yidun Wan (Feynman diagrams for interacting braids)

    This is a major advance in the inclusion of matter in four-valent spin networks of Loop quantum gravity. things analogous to matter appear as topological excitations (braids) in the network these things can propagate thru the network, and interact among themselves, in the normal course of the...
  4. D

    Trouble with drawing vector diagrams.

    Homework Statement Total time 2min, duck travels 22 m 36degree N of E,then 65m E 25degree S. Homework Equations The Attempt at a Solution i understand 36 N of E but what is E 25 degree S.
  5. T

    LaTeX Mastering Latex to Drawing Diagrams

    How to do that?
  6. W

    Counting Distinct Diagrams in Scalar Field Theory

    I was just trying to think of a simple relation to find the number of distinct diagrams to a given order within a theory (specifically I am thinking of a \phi^{4} scalar theory). I am reading Tony Zee's book and am working through his "baby problem" where he expands the integral...
  7. S

    Feyman Diagrams - Best book to read?

    Hello - Physics & calculus are what I can best describe as hobbies for me. Hobbies in the sense that I love these topics but work a regular job as an IT Manager through the day and then read whatever I can get my hands on in regards to these topics while 'burning the midnight oil'. Not sure if...
  8. N

    Software for Creating Physics Diagrams

    Hi all, I am writing up parts of my MSc thesis in physics early and it has become apparent that I need some software to produce some reasonable quality diagrams in the write up. The diagrams will mainly be 2D but need labels in most places with Greek characters, arrows etc.. Any ideas on...
  9. P

    Free Body Diagrams - Finding Acceleration, and tension

    Homework Statement Three blocks, of masses m1 =26 kg, m2 = 38 kg, and m3 = 41 kg, are connected by two strings over two pulleys, as in the given attachment. Friction is negligible. Determine (a) the magnitude of the acceleration of the blocks and (b) the magnitude of the tension in each of the...
  10. P

    Two blocks and a spring and Free Body Diagrams

    Homework Statement 20: Two boxes are sitting on top of one another. The top box has a mass of 5kg and is connected to the wall by an unstretched spring, k=2000N/m. The bottom box is 10kg. the static friction coefficient between the 2 boxes is 0.5, the kinetic friction coefficient between the...
  11. I

    Connecting n-Point Functions, Feynman Diagrams & S-Matrix

    I would like to clearify the connection between n-point functions, Feynman diagrams and S-matrix. I do not want ( yet) to understand the detailed derivation of the LSZ reduction formula, just the rough connection between the n-point function on the one side and the S- matrix on the other...
  12. chemisttree

    Does anyone know how to read these diagrams?

    This is a spot diagram and graph of longitudinal abberation (LA) for an apochromatic lens quadruplet. I know that the LA graph should ideally come to a point for all wavelengths and it appears to in the graph but what is the 'y' axis? Is it the direction of focus? What does the 'x' axis mean...
  13. F

    Spacetime diagrams and proper time

    Hey guys, Can someone please explain to me this image: http://www.astro.ucla.edu/~wright/omega0.gif from the page http://www.astro.ucla.edu/~wright/cosmo_02.htm What i do understand: I understand the concept of light cones I understand that the units used for the axes means the lines...
  14. G

    Understanding PV Diagrams and Temperature Changes in Ideal Gases

    PV diagrams. a DIAGONAL straight line going down (negative slope) on a PV digram with P on y-axis and v on x-axis. The temperature of the gas ______________. Choices: Decreases then increase Increase then decrease At first I chose remains constant... but it was wrong. I tried to...
  15. 0

    Understanding Freebody Diagrams: Solving for Forces & Direction | Quick Help

    Hello all. I had a question about freebody diagrams. I know how to draw them and solve for forces/acceleration/mass/friction but one thing I was confused about is when you list summation of forces in either X or Y direction if there's a specific order to list them in, or if it matters. I know to...
  16. clope023

    Answer: Diagrams of Ammeters: Finding Correct Current Measurement

    Homework Statement In which diagram(s) (labeled A - D) does the ammeter correctly measure the current through the battery? Homework Equations I don't believe there are any here, just to know that the ammeter is in series with the current that is passing through it and is measuring...
  17. E

    Circuit Diagrams: Software to Draw White Background Diagrams

    does anyone know a software on how to draw circuit diagrams with white background? i have an LTspice software but i do not know how to convert it into a JPG pic file... what i do is print screen,go to paint and send it to photobucket which is more of a hassle thx (if this has been posted...
  18. I

    Learning Feynman Diagrams from Peskin & Schroeder

    Homework Statement I’m trying to learn Feynman diagrams from Peskin and Schroeder. I’m stuck right now on page 91-93, especially about constant factors and symmetry factors. Equation 4.44 and the two constants 3 and 12 in it make perfect sense to me. The trouble starts with 4.45. I understand...
  19. T

    Understanding PV Diagrams - Work

    Homework Statement Calculate the work done by the gas during process 1-> 3-> 6. Express your answer in terms of Po and Vo. Homework Equations W=integral(pv) from V1-V2 W=PVln(V2/V1) The Attempt at a Solution 3Po*V*ln(3Vo/Vo) I'm not sure what I'm doing wrong, it keeps...
  20. N

    How Do Electric Field Diagrams Indicate Charge and Field Strength?

    Can anyone help me interpret this electric field diagram? The center charge is -11 µC.
  21. D

    Bandstructure and E-k diagrams

    I'm currently taking a microelectronics course and I missed a couple of lectures due to illness. As a result, I didn't understand the lecture notes fully. I hope someone would be able to help me on this. I consulted the recommended textbook for this course but it turns out that it didn't cover...
  22. R

    Electromagnetism and Feynman diagrams

    1. Feynman says all of electromagnetism follows from Maxwell equations. 2. Somebody (Pointing to a Feynman diagram of a photon/electron reaction) said all of electromagnetism is in that one diagram. So, can anyone help me with these two questions: how does point 1 come from point 2. And, how...
  23. K

    Problem understanding circuit diagrams

    Homework Statement I know how to deal with resistors/capacitors etc in series and parallell circuits, but when it comes to more complex circuits I have no idea how to treat them, and I can't find any guides or info on it and my physics book doesn't tell anything. All solutions to this kind of...
  24. K

    Visualizing Free body diagrams?

    Visualizing Free body diagrams? solved, thanks tiny-tim and doc Al! I ran into a problem in my HW, I found the answer but I just have a hard time seeing as to WHY my answer is correct. http://i163.photobucket.com/albums/t288/Kyin1/1-6.jpg Thats the problem and my FBD is for block B. My...
  25. S

    Roller coaster free body diagrams

    Homework Statement so I am a 8th grader and i got a homework asignment to draw free body diagrams of a roller coaster on inclines, straight aways and bottom of the hill. we didnt learn about physics yet so here's the question - draw and label free body diagrams for the coaster car on...
  26. S

    Plotting contour diagrams? how do i do that?

    im learning about contour diagrams in my calculus text but I am totally confused as to how one should start drawing those plots? for example f(x,y) = x+y then its supposed to go like x+y = c y = -x +c ^^i can see that the slope is 1 but how do i plot this graph?..im told that i...
  27. DocZaius

    Understanding ct: Time vs Distance on Spacetime Diagrams

    ct axis?? Now that I am looking at spacetime diagrams that involve the speed of light, I am seeing the vertical axis as "ct". Since "c" is meters/second and "t" is seconds then wouldn't ct be ((meters/seconds)*seconds) and end up being METERS? Why would the time axis be in meters? I would...
  28. S

    Solution 2.39a: Integrators vs Differentiators

    For the question (problem 2.39a) stated in the picture attached to this message, I don't understand why integrators should be used in favour of differentiator for the block diagram representing the differential equation system. Is this b/c of the nature of the differentiator electronics too...
  29. B

    Slightly confused with Spacetime Diagrams

    Hello, So I am supposed to draw and find the displacement vector between to points in spacetime, coordinates being (3,2,0,0) and (-2,1,0,0). I somehow feel slightly stupid for asking this, but I was reading the textbook and looking through my lecture notes. What I basically did that draw a...
  30. Saladsamurai

    Shear and Bending Moment Diagrams

    Shear and Bending Moment Diagrams! Homework Statement Homework Equations Newton's 2nd and 3rdThe Attempt at a Solution So my main confusion is this: I found the reaction at A to be 19 kN If I make a vertical cut through some arbitrary point along the beam and and do some analysis I get...
  31. A

    What causes wave diffraction and how does it impact wave behavior?

    Heya! I'm new in the forum, and here is my first entry. I don't really understand the diagram for wave difraction. Let me try to draw it... | | | | | The space between the four three lines is suppose to be the wavelength. | | | | | | | | | | The last line is suppose to...
  32. K

    Feynmann diagrams interpretation and diagramm symmetry order

    I'm trying to understand Feynman diagrams interpretation in terms of virtual particles. What I still can't understand is how this interpretation is compatible with the fact that one should divide each diagram by its symmetry order. As far as I understand, diagram symmetry order means how many...
  33. Dale

    Educational value of spacetime diagrams

    I was thinking about how one would teach special relativity using a spacetime-geometric approach. I think you would first show spacetime diagrams in a single frame and describe velocity as the slope of the worldline. Then when you moved onto other frames it would be natural to leave the slope...
  34. N

    What is the torque on a crate being carried up stairs at an angle?

    Homework Statement Two friends are carrying a crate of mass 200 kg up a flight of stairs. The crate has length 1.25 m and height 0.50 m, and its center of gravity is at its center. The stairs make a 45.0 angle with respect to the floor. The crate also is carried at an 45.0 angle , so that its...
  35. P

    Drawing circuit diagrams in a household

    Okay I'm supposed to draw a circuit diagram of an apartment, including the circuit breakers power meter. How do I draw that something is plugged into an outlet? I'm supposed to draw the 'kitchen' with 3 panels, parallel circuits used, and following these requirements: -one panel contains...
  36. S

    Understanding Potential Reflections and Transmissions with Diagrams

    Homework Statement (*I have solved similar problems before and know the method, but my results don't make sense, so I want to make sure I understand this particular potential. Also, I am new to Latex so ignore the equal portion of the less/greather than or equal two signs.*) I made a diagram...
  37. V

    Difference between Fermions and Bosons in Feynman diagrams

    What distinguishes Fermions form Bosons in Feynman diagrams?
  38. L

    Category Theory: ?What is up with these Diagrams?

    Category Theory: ?What is up with these Diagrams? So I found a basic category theory book online and was trying to learn some of the basics. Many of the proofs are done in diagram form (and it seems to very greatly reduce their lengths). However, no where in the book does the author prove...
  39. A

    Short Circuit Protection Diagrams

    Is there any Short circuit protection diagram designed for power supplies which the current doesn't drop below 1A? Can you show me any?
  40. V

    Current and potential difference, simplifying circuit diagrams

    [SOLVED] current and potential difference, simplifying circuit diagrams Consider the circuit shown in Figure P31.69, in which RA = 25 and RB = 7 . Tabulate the current through, and the potential difference across, each resistor. Figure P31.69 resistor current (A) potential...
  41. D

    Venn Diagrams Concepts(including advanced concepts)

    Goodevening, I am confused with Venn diagrams questions(2/3 circle diagrams). Can i find some online resources which explains its concepts(including advanced concepts). Eg. 3circled(A,B,C) diagram is there. Find minimum/max. possible of ONLY A such that B is minimum/maximum - how to do these...
  42. O

    Solving Skiing Problems: Net Force, Speed & Free-Body Diagrams

    Homework Statement A skier goes down a slope with an angle of 35 degrees relative to the horizontal. Her mass, including all equipment, is 70 kg. The coefficient of kinetic friction between her skies and the snow is 0.15. A. Please draw a free-body diagram of the skier. B. Calculate the net...
  43. B

    Drawing Vector Diagrams for Problem-Solving

    Here is the problem i need help with. I run up a down escalator at a speed of 2 m/s while the escalator is moving at a rate of 0.75 m/s. What is the resultant velocity? Of course, I do not need help getting the resultant velocity. I just need help drawing the vector diagram that can help...
  44. M

    Fine literature on penrose diagrams?

    So here I'm begging for your suggestions. Thanks.
  45. P

    A as Sum of B & C: Vector Diagrams

    Homework Statement Which of the following vector diagrams represent "A" as a sum of "B" and "C". (A=B+C) http://img402.imageshack.us/img402/94/vectorsnj3.jpg Homework Equations None that I know of. The Attempt at a Solution I think the answer is number 1, because A is the...
  46. B

    LaTeX Making pretty diagrams for LaTeX docs

    Hey guys, So I've Latex'd some papers and assignments in the past, but something that's always daunted me is how to make those snazzy custom figures that the TAs always make in their homework solution writeups. Is there some program that most people use to make their diagrams that they then...
  47. A

    Deriving classical potentials from tree diagrams

    I'm looking for a good book for graduate students that indicates how one can obtain a (classical) potential from a tree-level Feynman process. For example, how can one go from the S-matrix of e.g. Compton scattering and derive the Coulomb potential. Any help would be appreciated.
  48. C

    How Do They Calculate the 9 Degrees in the Force Diagram?

    Homework Statement http://img61.imageshack.us/img61/4585/8m1cdhx1.gif I understood every except, How do they get the 9 degrees in part c? Homework Equations The Attempt at a Solution
  49. O

    How do I create a ray diagram for refraction using a beaker and pencil?

    Hey guys I'm new here and I'm lookin' for some help as I'm sure a lot of you come here for that reason as well. I did an experiment where I fill a 150 mL half full, place a pencil in the middle and move it sideways until it reaches the side of the beaker. Then I am to draw a ray diagram of what...
  50. C

    Trouble understanding block diagrams

    Hello everyone! I'm currently reading Signals, Systems and Transforms by Charles L Phillips, John Parr and Eve Riskin, and I can't really get a grip of how to read a specific block diagram. The second-order differential equation a_2 \frac{d^2y(t)}{dt^2}+a_1 \frac{dy(t)}{dt}+a_0 y(t)=b_2...
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