Diagrams Definition and 689 Threads

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. C

    Free Body Diagrams for hockey puck

    Homework Statement A hockey puck slides along a horizontal, smooth icy surface at a constant velocity as shown. (Part A figure) Which of the following forces act on the puck? Okay, for this the choices are (list check all that apply) force of velocity x air drag...
  2. K

    Special Relativity, Light cones in Minkowski Diagrams

    Homework Statement Show that a point Q outside the "light cone" can occur either before or after a point P inside the light cone (eg: at the origin), depending upon the frame of reference. Show that a point R inside the light cone is always in the future or in the past with respect to P...
  3. S

    Analyzing motion diagrams (easy)

    Homework Statement If i have a picture of a motion diagram of 2 objects , how do i tell when they have the same speed and acceleration? and at what time one object is ahead of Object B ? I have a diagram here http://i33.tinypic.com/28kpk02.jpg Homework Equations none The...
  4. B

    Short question: Spontaneous emission from Feynman diagrams?

    Hey all, I am just wondering if one can directly calculate the Einstein coefficient in spontaneous emission of, say, two-level atoms through feynman diagrams? I searched for sources in google but could not find anything. Thanks a lot for an answer! Wit best regards, blue2script
  5. M

    Mastering Free Body Diagrams: Tips and Tricks for Difficult Homework Problems

    Homework Statement Here is pictures of some of the mechanisms I draw the free body diagrams for Homework Equations EF= 0 EM= 0 The Attempt at a Solution I am not sure how to even begin on the first problem other than drawing the force from the hand of 400 N.
  6. H

    Solving for $\vec{\upsilon}$ from Diagrams

    Homework Statement http://img3.imageshack.us/img3/2178/9b26f2dd8dd8a8686c9c8c2.th.png Homework Equations \vec{\upsilon}= \vec{\Delta} V / ( B d) \vec{\upsilon}= u E The Attempt at a Solution from the diagram , we have \vec{\upsilon} = 1.25*10^-5 V/(B)(0.001m) using the...
  7. B

    Problem with electric diagrams.

    Homework Statement so I've had no real problems with this unit at all until i got to this first question. I had no idea where to start, but i tried working some things out, and couldn't get the right answer. the second question seems to be along the same lines with my problem. when the given...
  8. W

    Space-Time Diagrams: Explaining & Setting Up

    I have just started a class that deals with relativity. My professor uses space-time diagrams all the time but has never bothered to fully explain them. Every time I have questions about my homework problems, people tell me to work it out by drawing a space-time diagram. Could anyone explain...
  9. M

    Velocity and accleration diagrams

    how do we go about deciding the directions while drawing the velocity and accleration diagrams for a given slider crank or slotted crank mechanism.while drawing the accleration diagrams,2 components -tangential and radial component need to be shown ,so when we draw the tangential...
  10. P

    QFT: Exploring Connected Diagrams & Single Sources

    hi all, i have a question regarding page 81 in Srednicki's QFT book. He states there that the sum over all connected diagrams with a single source is zero. Then he says that if you replace this single source by an arbitrary subdiagram the sum will still be zero. Can somebody explain why this...
  11. D

    Divergent tree level Feynman diagrams?

    Hi everybody! I'm a new Physics Forums user and hope someone could help me out with my minor dilemma. I'm a PhD student in mathematical/theoretical physics and I' working on the Boltzmann equation in QFT. Up to now, there was no major emphasis on Feynamn diagrams - the approach was rather more...
  12. S

    Lattice diagrams and generator in Algebra

    Homework Statement I do not understand the following statement (Please, see the attachment): "C4 has trivial subgroups and only one cyclic subgroup of 2 elements, namely <b>. This is because both a and c can be verified to be generators of C4." The Attempt at a Solution The notation...
  13. S

    Is It Possible to Represent Group Products Using Venn Diagrams in Algebra?

    Homework Statement Let G be a group, and let H and K be two subgroups of G. Then the union of H and K is a subgroup of G such that the intersection of H and K is an empty set. Can you visualize the product hk in a venn diagram for all h which belongs to H and for all k which belongs to...
  14. K

    Newton's third law and free body diagrams

    Homework Statement "Three blocks (m1, m2 and m3) are in contact with each other on a frictionless, horizontal surface. A horizontal force is applied to m1. http://i4.photobucket.com/albums/y111/kathy_felldown/sb-pic0556.png What is the net force on block 1? " When drawing free body...
  15. M

    Interpretation of spacetime diagrams.

    Hello all I have been at ease with spacetime diagrams of the usual sort where the y and z dimensions are suppressed until I came across this passage from the following book. Problems of Space and Time. A reader edited and with an introduction by J.J.C.Smart. Page 293 of the chapter...
  16. marcus

    lowest scatter Hubble diagrams ever published (Bailey et al)

    "...lowest scatter Hubble diagrams ever published" (Bailey et al) This is big news for cosmology. More accurate determination of distances and therefore of the Hubble parameter---a key proportion basic to the whole field. http://arxiv.org/abs/0905.0340 Using Spectral Flux Ratios to...
  17. F

    Fluid Mechanics Pressure Intensity Diagrams

    I was wondering if anyone could please explain what an intensity diagram would look like if you had a layer of fresh water ontop of x amount of meters of salt water (or vice versa). What is the concept behind this? How could you draw it? The question keeps popping up in past exam questions but i...
  18. B

    Free-body diagrams for constrained rigid multibody dynamics

    Hi all, I have been reading the book "Computational Dynamics" by Ahmed Shabana, and have a few questions. The book talks about creating "free-body diagrams" for constrained rigid multibody dynamics problems. I have attached two examples: The first is a "pendulum with a moving base": which...
  19. R

    Find First TOF Mass Spectrometer Diagrams & Schematics

    Hello. I'm looking for electronics diagrams & schematics of very fist TOF mass spectrometers like the one of W.E.Stephens or Cameron's Ion Velocitron. These electronics equipements used vacuum tubes and present very interesting characteristics. If someone knows where I can find such schematics...
  20. V

    Help with continuous cooling diagrams

    I have the answers to these, but I have a question about them. The answers to 1 are P,P,M+P,M , and the answers to 2 are F+P,A+B+F+M+P,A+B+F+M,A+B+M,A+M . My question is, how come some of the answers to 2 have austenite, while none of the answers to 1 do? I don't see a Mfinish line...
  21. K

    LaTeX Software Recommendations for LaTeX Diagrams on Linux Ubuntu

    I'm sorry if this is the wrong forum but I think that mathematicians often work with LaTex and should be able to answer. Could you please recommend me any kind of software for creating diagrams (plotting functions, drawing vectors, writing down matrices, etc) and then converting these...
  22. P

    Free-body Diagrams for Bicycle and Person sitting on it

    A person is on a bicycle, there are several situations like the bike is at rest, accelerating,etc. The one I'm having most trouble with is when bike is in constant velocity. For the bike,I have gravity and force of person acting downward, normal force upward, force applied to the right and...
  23. T

    LaTeX Create Math Diagrams in LaTeX: Does TeX Have Diagram Package?

    Does the TeX install here have a diagram package? For diagrams like commutative diagrams. It would be nice.
  24. malawi_glenn

    Exponent of disconnected Feynman diagrams

    hello, I am trying to follow the arguments in Peskin pages 96-97 where the exponentiation of disconnected diagrams are performed. I think the 'proof' is too 'not detailed' and was wondering if there exists a better explanation elsewhere? My biggest question is the sentence on page 97 "The sum...
  25. M

    Drawing Hasse Diagrams for Divisibility Relations

    Homework Statement Draw the diagram P=(X,P) where X={1,2,3,5,6,10,15,30} and x<y in P IFF x divides y. Homework Equations The Attempt at a Solution We just started this discussion in class and I am really not getting the concept of how to draw the corresponding Hasse diagram. I...
  26. P

    Drawing Karnaugh Maps Using Venn Diagrams

    Hey, can anyone help me with drawing karnaugh maps using venn diagrams? i don't full understand how to.. thanks
  27. D

    How Do You Effectively Apply Free Body Diagrams in AP Physics Problems?

    Hey everyone hows it going? I am not sure if this is the right place to be posting this question, but hopefully it is. My names Shawn and I am a senior in high school. I currently have AP calculus and gen physics, and I plan on taking the AP calculus test (ab) and hopefully the physics AP test...
  28. T

    Drawing Free Body Diagrams for rope tension

    Homework Statement A man of mass 64.2 kg stands on a scaffold supported by a vertical rope at each end. The scaffold has a mass of 23.2 kg and is 3.2 m long. Suppose the man stands to the right from the middle of the scaffold that is a distance one sixth of the length of the scaffold. What is...
  29. R

    Homework Solution Understanding Phasor Diagrams for Circuit Analysis

    Phasor Diagrams?? Homework Statement Say I am given this circuit diagram. I have the recorded values on the voltmeter and ammeter. I can verify the power factor rating using these two values. But I also need to draw a phasor diagram for this circuit as well as two others which just have...
  30. F

    Motion Diagrams: Identifying True and False Statements

    Homework Statement The drawings indicate the motion of a ball (moving from left to right), subject to one or more forces on various surfaces. Each circle represents the position of the ball at succeeding instants of time. The time interval between each circle is one second...
  31. M

    What is the relationship between density and phase diagrams?

    Homework Statement "Which is the denser phase, monoclinic or rhombic sulfur? Homework Equations Density = Mass/Volume... The Attempt at a Solution How can you tell density from a phase diagram?? Thanks! =) -Megan
  32. N

    Conformally inequivalent tori (for one-loop string diagrams)

    This is driving me nuts. Hope someone can explain this to me. To classify conformally inequivalent tori, one introduces the parameter tau. Tori with tau =tau +1 and tau = -1/tau are conformally equivalent. Now, consider two conformally inequivalent tori. Let's say one has tau =i and the...
  33. K

    What are the key concepts in Srednicki's explanation of Feynman diagrams in QFT?

    I'm trying to learn Feynman diagrams from Srednicki's QFT book! Could someone retell and summarize in his or her own words what Srednicki is saying in the three paragraphs after equation 9.11? (I don't understand what the (2P)!/(2P-3V)! different combinations are, how Feynman diagrams are...
  34. S

    Drawing programs for diagrams in papers

    I don't know which forum this question pertains to. What are the best programs that can be used to create without too much effort good quality smooth diagrams in a scientific paper? A colleague of mine used CorellDraw. What do you use?
  35. A

    What is the path on the pV diagram for an isobaric expansion from 2 m^3 to 5 m^3?

    Draw the path in the pV diagram for an isobaric expansion from a volume of 2 m^3 to 5 m^3. Idk which of these equations are needed because they all are given with this section... ΔU=Q-W ΔU=Q+W W=PΔV ΔU=Q W=nRTln(Vf/Vi) Q-W ΔU=-W ΔU=+W e=W/Qh=1-Qc/Qh e=1-Tc/Th ΔS=Q/T My...
  36. G

    Draw a bode and nyquist diagrams

    I have a task to draw a bode and nyquist diagrams from an expirmential results by using MATLAB, I have the phase delay and the votage gain data (10 results for each), can you help me how to darw bode and nyquist diagrams in MATLAB and which command I can use? thanks
  37. N

    LaTeX Drawing electrical circuit diagrams with LaTeX

    Hi all. I've searched the WWW, and it doesn't seem that there is an easy way of doing this. Do you have any experience with this? Thanks in advance. Niles.
  38. G

    Bode & Nyquist diagrams from expirmental results

    Hi I have a task to draw a bode and nyquist diagrams from an expirmential results, I have the phase delay and the votage gain data, can you help me to darw bode and nyquist diagrams? Thanks
  39. P

    Peskin - exponention of disconnected diagrams

    Hi all, I have a question regarding p.97 of Peskin Schroeder and its explantion of disconnected diagram exponentation. I do understand the formula on the buttom of page 96. \prod{\frac{1}{n_i!}V_{i}^{n_i}} \cdot (value \; of\; connected \; piece) ButI do not understand the sum over \{ n_i \}...
  40. D

    How Do You Calculate Work on a pV Diagram When Pressure Varies?

    http://session.masteringphysics.com/problemAsset/1003314/14/151890.jpg Part D Calculate the work W done by the gas during process 1\rightarrow3\rightarrow6. Express your answer in terms of p_0 and V_0. Okay so I know that W = p*deltaV, but p is not constant in this case, so what do I do?
  41. J

    Create Professional Circuit Diagrams: Step-by-Step Program for Word Printing

    Is there a program where I can make a circuit diagram and put it in a Word document and print it?
  42. G

    What are the benefits of Nyquist and Bode diagrams?

    Hi I want your help to understand the comparative merits of Nyqist and Bode diagrams, if you can explain that merits to me? Thanks
  43. L

    Solving Quantum Objects to Energy-Level Diagrams

    Homework Statement Suppose we have reason to suspect that a certain quantum object has only three quantum states. When we excite a collection of such objects we observe that they emit electromagnetic radiation of three different energies: 0.8 eV (infrared), 2.1 eV (visible), and 2.9 eV...
  44. R

    Why Are Energy and Voltage Inversely Related in Band Diagrams?

    My professor has said several times that if you increase the potential (electrostatic) you will get a lower energy in terms of a band diagram. In particular, I have been working with MOS-Capacitors and this seems to be the case. For example for an n-type semiconductor. If you apply a...
  45. S

    Reactions And bending moment and shear force diagrams

    Hi. I've been given this to calculate the support reactions but I'm not sure how to handle the increasing udl. And how would this be shown on a Bending moment and shear force diagram?? Also with non increasing Udl's when calculating the reaction is it best to change the udl to one force...
  46. F

    Forces and Motion, Free-body diagrams help

    Homework Statement An object motion is described by the following equations: deltax=(0m/s)(5s)+(1/2)(ax)(5s2) 32N-18N=(12kg)(ax) Sketch a FBD, invent a situation which could be described by these equations. How far does the object move? Homework Equations displacement equation...
  47. J

    Symmetry factors for Feynman diagrams

    Hello I have to calculate symmetry factors for the following feynman diagrams for my qft class, and would be hugely grateful if anyone could point out any mistakes (I'm sure there are lots!) that I've made. http://picasaweb.google.com/jessicagreerstanley/Physics#5259179071440262450"...
  48. M

    Build a "Piano" with Solenoids: Material Selection & Diagrams

    I was thinking that it's possible to make a sort of "piano" using solenoids. If you had a spring to reset it, and the "keys" of the "piano" activated simple contact switches, it could be done, right? It wouldn't be a terrible strain on the batteries if the contact were as short as pressing...
  49. I

    Calculating Force in a Rifle-Bullet System

    Homework Statement A rifle weighs 50.0 N, and its barrel is 0.750 m long. It shoots a 25.0 g bullet, which leaves the barrel at a speed (muzzle velocity) of 320 m/s after being uniformly accelerated. What is the magnitude of the force exerted on the rifle by the bullet? Homework Equations...
  50. C

    Net force, force diagrams, normal force

    In a problem whereby you want to calculate the net force of the rope lifting a box, and there is something in the box, whether you take into account the normal force. The forcees would be the tension of the rope, and the weight of the box and the object inside. To caculate the net force of the...
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