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. G

    What is the Acceleration of a Couch Being Pushed at an Angle with Friction?

    Homework Statement An 82 kg couch is being pushed with a force of 56 N at an angle of 40 above horizontal. If the coefficient of friction between the couch and the floor is 0.051, what is the acceleration of the couch? Homework Equations The Attempt at a Solution
  2. M

    Beachball Diagram Help: Understanding Focal Mechanisms and Strike Lines

    Ive been studying beach-ball diagrams and have the general idea behind it but I think if I get the answers to these samples it will stick. This is not homework but is important because I have a test in the morning...
  3. J

    Cantilever beam point load analysis with diagram

    Homework Statement Require various values from cantilever beam analysis including Bending moment K stiffness 2nd moment of inertia Max stress Homework Equations Shown belowThe Attempt at a Solution Here is my attempt at this question but I am unsure about units and therefore my answers?Bending...
  4. D

    Drawing a shear force diagram with loads working at an angle

    I was wondering how you incorporate an angled load into a shear force diagram? So far I've only been working with vertical loads and I've looked through my entire book without finding an example with loads at an angle, so I'm not sure what to do here. I know I have to end up at 0 so I see I...
  5. D

    MHB Definition of H in pulley diagram

    Why can $H = \left(\ell - \frac{b}{\sin\theta}\right)$ where $\ell$ is the length of the rope. (everything is frictionless.) http://img690.imageshack.us/img690/579/pulley.png
  6. jaumzaum

    Spacetime diagram - Twin paradox

    I was studying the twin paradox (of Einstein special relativity) and everything was working well until I get to the traveler's spacetime diagram. First let me introduce the paradox for you to understand the diagram. Pam is the twin sister of Joe. Pam goes out Earth in 2007 in a spaceship...
  7. Z

    Frictional force in a free-body diagram

    Homework Statement I am having trouble understanding the direction of a friction force in a sample problem from Engineering Mechanics, Meriam & Kraige. I will attach a picture for no confusion. http://i.imgur.com/0EdCofi.jpg The Attempt at a Solution Consider only the top...
  8. W

    Is there another, better way of doing this? (simple circuit diagram)

    I need one small input to switch on a slightly larger circuit permanently, until I cut the power off or until I open the switch. Relays seem a bit expensive and intended for higher voltage applications than I require. Is there a way to swap the relay here with transistors or something?
  9. J

    How to interpret a Free Body Diagram for a Kite in Flight?

    The wind is blowing with a force of 48 N against a kite that Taylor is flying, so that the tail of the kite makes an angle of 24° to the ground. I am just really confused on this, I attacted the solution would anyone mind explaining it? I have no idea on how to get this
  10. Z

    Diffraction at an object - diagram?

    I was wondering if anyone would have a link to, or have, a diagram showing light wave diffraction at an obstacle? That is, when it collides with an obstacle, then diffracts around the corners. It's easy to find diagrams for slot experiments, but am having problems finding a good diagram...
  11. E

    Engineering What are the Unknowns in a KVL Circuit Loop?

    1.http://imgur.com/d2lf8sa 2. V=IR 3. I feel like the answer should just be .012 because 1.2/100. Apparently that is wrong. If that is truly wrong. I also found I3 to be 3.25mA because 3.9 volts in parallel and V=IR
  12. P

    Understanding Free Body Diagrams for Cantilevered Structures

    For the attached picture I need to draw a free body diagram for the structure supporting the pulley. At the fixed end (left), there would be a vertical and horizontal reaction force as well as a moment. I am not sure what the forces and moments would be for the part connected to the...
  13. J

    Feynman Diagram of Neutron-Antineutron reaction

    Homework Statement Is the following reaction possible? If so, by what force? Draw (one of, if applicable)the lowest order Feynman diagrams for the process. n + n-bar --> ∏+ + ∏- + ∏0Homework Equations N/AThe Attempt at a Solution This process, it seems to me, should be possible. It...
  14. T

    Free Body Diagram and applied force

    Homework Statement A cavewoman is dragging her 65.4 kg mate home, up a gentle 10° incline. The co efficient of friction for skin on oil is 0.40. What is the minimum applied force she needs to keep the neanderthal moving with uniform motion? Homework Equations ff=μFn fg=mg fnet=ma The...
  15. P

    Calculating net force from a diagram

    Homework Statement Calculate the net force acting on each object indicated in the following diagrams. Homework Equations c^2 = a^2 + b^2 sinA/a = sinB/b = sinC/c c^2 = a^2 + b^2 - 2abcosC The Attempt at a Solution Fnet =? Fnet(v) = 8.0 N [N] + 10.0 N [S] = 10.0 N [S] - 8.0 N [N]...
  16. L

    Designing a Beam from Shear Force & Bending Moment Diagram

    Homework Statement We need to design the cross section of a beam to make it suitable to carry a uniformly distributed load. The beam is held up by 4 ropes which are shown on my diagram as R. In the same attached picture I have the shear diagram and the bending moment diagram for this...
  17. S

    Laplace and pole zero diagram.

    The following diff. equation describes the functionality of a system with respect to time. However, it is not known how the system will behave when stimulated. Apply a forward Laplace transform to determine damping ratio and pole zeros. Plot a pole zero diagram and comment on stability. d2y/dt2...
  18. Q

    Feynman Diagram for Electron-Proton Attraction

    Would it just be the same as with two electrons? (or any other pair of particles with the same charge) I'm kinda in two minds, I suspect that is wrong because wouldn't the fact that they attract each other (instead of repelling) means that the diagram would be drawn differently?
  19. P

    PV Diagram help - Monatomic ideal gas change of state

    Homework Statement Suppose a monatomic ideal gas is changed from state A to state D by one of the processes shown on the PV diagram (attached). a) Find the total work done on the gas if it follows the constant volume path A-B followed by the constant pressure path B-C-D. b)Calculate the total...
  20. R

    Understanding Nilsson Diagrams for Np-93 Atom

    anyone know how to read a Nilsson-diagram? I have a Np, z=93 atom and trying to see the proton diagram. How to see the deformation? I start with the 82 lvl in the diagram and count upwards., 2 protons per lvl. But wouldn't it be the same amount of lines up to the ground state 5/2+ lvl of...
  21. V

    Rules to compute Feynman Diagram with the Feynman rules

    Hello, I am trying to compute feynman diagrams with the feynman rules but I encounter some difficulties... Since the gamma matrices, spinnors, etc do not comute, the ordering of the different factor from feynman diagram has an importance. Is there some rules that say where to begin and in...
  22. N

    Hasse diagram: minimal, least, greatest

    Homework Statement Let S = {2,3,4,5} and consider the poset (S, <=) where <= is the divisibility relation. Which of the following is true? 1. 3 is a minimal element 2. 4 is a greatest element 3. 2 is a least element 4. Both 2 and 3 Homework Equations The Attempt at a Solution My answer: 1 In...
  23. S

    Where do external photon terms go in Feynman diagram term ordering?

    I'm reading something which highlights the Feynman rules for QED, and it talks about what happens if you go along a fermionic line. For example this picture: http://wikipremed.com/image_science_archive_68/010601_68/170750_298px-ComptonScattering-u.svg_68.jpg According to these notes, there...
  24. Z

    Brown Dwarfs on the H-R diagram

    Do Brown Dwarfs appear on the lower right hand "tail" of the main sequence of the H-R diagram? Or are they separate from the main sequence? The location here: https://en.wikipedia.org/w/index.php?title=File:HR-diag-instability-strip.svg&page=1 appeared to show them in that location, but...
  25. S

    Circuit diagram of an active power filter

    Hi Is anybody in the house that can help with circuit diagram of an active power filter for mitigating harmonic current.
  26. X

    Solving Sequence Diagram Issues for Placing a Bet

    I'm having issues doing a sequence diagram for a program. Like this format here: http://upload.wikimedia.org/wikipedia/commons/thumb/9/9b/CheckEmail.svg/220px-CheckEmail.svg.png The scenario is the following: Placing a bet - a customer places a bet for a game. The customer has to be...
  27. R

    Spacetime diagram based question.

    Homework Statement A Spaceship is moving with speed ß=4/5. Its length at rest is 1sec. A light is turned on at the rear of the ship, reflected back from a mirror at the front. a.) How long does an observer at rest say it takes for the light to return to the rear of the ship (total round...
  28. Jalo

    Thermodynamics - Temperature/Entropy diagram

    Homework Statement If I have a diagram P-V how can I turn it into a T-S diagram? (Temperature-Entropy) Homework Equations The Attempt at a Solution I know that Q=TdS <=> dS = Q/T If a process is isothermic I'll just draw a line. If the process is adiabatic I'll draw a...
  29. A

    Mastering CMOS Circuit Drawing: Get Expert Feedback on Your XOR Gate Design

    I understand how to draw a CMOS circuit but I am not so confident if I do it right. I need someone to check if I draw them right. As for the second one which is a XOR gate, I am not sure at all on how to draw it since there are both the 0 and 1 inputs in the circuit.
  30. PhizKid

    Force diagram for ring/bead problem

    Homework Statement A ring of mass M hangs from a thread, and two beads of mass m slide on it without friction. The beads are released simultaneously from the top of the ring and slide down opposite sides. Show that the ring will start to rise if m > 3M/2, and find the angle at which this...
  31. V

    Wrote general equation for a free body diagram

    So I derived this equation for the net force/acceleration of a motorcycle on a flat surface. I believe this equation could practically be used for any rolling object. ƩF = Fp - μ*Fn - FD Where: FP is the force of the bike acting against the ground, tangent to the ground FD =...
  32. J

    Bell Paradox Questions - Diagram help

    Consider the following thought experiment. Two spaceships are initially floating in a region of space far removed from other matter. They are at rest with respect to each other, and with respect to some inertial reference frame F. There is a distance L between them. At some time, t=0, as...
  33. B

    Feynman Diagrams: Does Distance Affect Electromagnetic Interaction?

    Hello all . In feynman diagram horizontal direction is space . is that mean distance between particles ? is that means two electron must be near a certain distance to create a virtual photon ? Does one electron in Earth send electromagnetism force to one electron on moon by virtual photon ...
  34. P

    How to Solve Venn Diagram Questions with Multiple Possible Answers?

    These kind of questions always get to me and I don't know how to solve them. Lets say that there are X many people that are in sports. Y of them are in soccer, Z of them are in cross country, and A of them are in basketball. And Y+Z+A>X How would i find out how many people do two sports or...
  35. D

    Uniform cylinder force diagram

    Homework Statement A uniform cylinder of mass m and radius R rests in equilibrium against a rough plane that is inclined at an angle α to the horizontal. The cylinder is supported by a cord under a constant tension, wrapped round it, so that the cord leaves the surface of the cylinder...
  36. 7

    Length contraction and Minkowski diagram

    Hello, in my other topic members on the forum helped me to understand time dilation by using Minkowski spacetime diagram. Now i would also need some assistance with explaining length contraction in Minkowski spacetime diagram. I have observer Žiga in his frame ##x,ct## and observer Ranja...
  37. M

    Bands, Energy diagram in a diamond

    Homework Statement The gap between valence and conduction bands in diamond is 5.47 eV. (a) What is the maximum wavelength of a photon that can excite an electron from the top of the valence band into the conduction band? In what region of the electromagnetic spectrum does this photon lie...
  38. J

    Where exactly is the battery in this diagram

    Homework Statement I'm having trouble figuring out where exactly the battery is and if it's connected in series or parallel when the diagrams are given like in the image below. The book gives this description for the diagram. I don't really understand it. In other words how can I...
  39. M

    Free body diagram on moment and torsion

    Homework Statement It's not exactly a homework question, just want to see if i have the right concept in drawing free body diagrams See attached Picture. In case 1, the object is fastened on plane x-z and the rectangular block is fastened to the T-block in y-z plane. Will the force be...
  40. J

    Vectors and moments (Vector diagram, horizontal/vertical components, weight)

    Hello, I was solving a vector & moments question as a part of my revision and got stuck somewhere. I really need your help.. some sub-questions are solved, please correct me if I'm wrong. Here's the question (Its kinda long) : The free-body diagram shows three forces that act on a stone...
  41. C

    Mechanisms + Acceleration Diagram

    Studying for my exams I came across this from a previous exam. I could do part i but could not do the second part. If someone could explain how to or provide their working would be appreciated and for part i their working to compare. Thanks for the time.
  42. 7

    Time dilation and Minkowski diagram

    After i figured out how to show length contraction in this topic. I tried to use a similar way to show time dilation in Minkowski diagram. Time dilation means that time interval between two events is the shortest in the frame in which those two events happen in same place. We call this frame its...
  43. S

    Labelling sets in a Venn diagram

    Homework Statement Label each set in the following Venn diagram as described in the attached pdf file. Homework Equations The Attempt at a Solution Unable to find a relationship that can describe the second set B. Obviously set A is a collection of Odd numbers.
  44. K

    The Feynman Diagrams of Quantum Electrodynamics

    Hi all, I'm just getting started on particle physics and I have a few foolish :shy: questions about drawing feynman diagram. First, when do we draw the gauge bosons(such as W) vertically rather than horizontally through time? Second, can we always replace mediator photon by Z boson...
  45. N

    Finding heat from a PV Diagram

    Homework Statement A monoatomic gas follows the process 1--> 2---> 3---> shown in the figure. How much heat is needed for (a) process 1-->2, and b process 2-->3 ? Link...
  46. A

    U and V in the Kruskal Diagram

    I would just like to verify whether or not the variables u and v in the Kruskal diagram are functions of t. Thanks!
  47. G

    Energy related problem (includes diagram)

    Homework Statement A box m = 88 kg is being pulled by a constant force F = 176 N at an angle of θ = 38 degrees. m = 88 kg θ = 38 degrees F = 176 N Homework Equations W=Fd The Attempt at a Solution (a) Write an expression for the work done by force F on the block over a...
  48. E

    Moment of a Distributed Load on Beam, Scanned work and Diagram.

    Homework Statement Determine the forces of reaction.Homework Equations SUM of Y forces=0 SUM OF FORCES ABOUT POINT B = 0 The Attempt at a Solution My attempt is in the link, I scanned the diagram along with my work. Thanks for the feedback, appreciated. http://imgur.com/i3cB2 <----- Link
  49. B

    Understanding Wave Motion: Exploring the Path of a Point on a Wave

    Homework Statement http://i1269.photobucket.com/albums/jj597/bubakazouba/114d22d10848ac93ac2fcea482ffe527_zpsedb41f24.jpg the other line is a drawing of me trying to trace the wave(but of course its wrong,Im sry try to ignore it) the answer is A Homework Equations My teacher told me that...
  50. V

    Is the Free Body Diagram for C-Spanner Screw Failure Analysis Correct?

    Hi guys, I'm working on one assignment about C-Spanner screw an impeller failure analysis. However, we're unsure if the free body diagram we draw is correct or not, given that our calculated safety factor is unreasonable. Can anyone give us a hand and have a look. Moreover, if someone can...
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