Diagrams Definition and 659 Threads

**a horizontal force with magnitude A is acting on a pulley as shown. the two masses p and P are moving together, same acceleration. p is trying to fall to the left but the tension from the rope and the static friction is keeping it in place. Everything else you need to know is in my two...

The standard definition of coordinates on Penrose diagrams seems to be something like \tan(u\pm v)=x\pm t. This is what Wikipedia gives, and Hawking and Ellis also give a transformation involving a tangent function, although I haven't checked whether the factors of 2, etc. agree. Neither source...

I'm planning to plot phase diagrams of Temperature vs Composition. I found the formula ln(x) = \frac{\Delta H}{R} (\frac{1}{T_A} - \frac{1}{T}) from the Clapeyron equation. Its a ideal solution of 2 metals in L state and regular solution in S state. Eutectic temperature is at 850C and enthalpy...

For instance, in the below diagram: [PLAIN]http://img101.imageshack.us/img101/3205/59914396.png How do you know if the reaction force on the beam is in Direction A or B? How do you determine the correction direction?

Homework Statement The potential energy of a pair of atoms separated by a large distance x is given by U(x) = -C6/x6, where C6 is a positive constant. What is the force that one atom exerts on the other? Is this force attractive or repulsive? Homework Equations F(x) = -dU/dx...

I'm working through Srednicki's QFT text, and I'm continuously vexed by the various numerical factors in diagrams and vertices, as well as the grouping of diagrams. For example, in Chapter 10 (pg 75) Srednicki treats basic \phi\phi\rightarrow\phi\phi scattering processes in \phi^3. He claims...

Hello, I need help with plotting a S-N curve using Excel given the data below I know how to plot using the scatter function in excel but i am confused on what values should go on the y-axis...i.e S...it is clear that the number of cycles will obviously go onto the x-axis...Please explain what...

Homework Statement Please see the attachment, Q2 Homework Equations \sumFx = 0 \sumMA = 0 The Attempt at a Solution for part A, i get 14123N as the tension, moment at C about B, 9.8x1000x5 = 49050 49050/7 = 7007N tan-1 (4/7) = 29.74o TSin(29.74) - 7007 = 0 TSin(29.74) = 7007...

Homework Statement Bobo decides to go skydiving. When he jumps from the plane, his mass combines with the mass of his chute is 75.4kg, which means that the force of gravity on him is 739N. A. Before he opens the chute, the wind resistance on Bobo gives him an upward force of 10N. Draw a force...

Homework Statement I have to make a scheme of a bit detector that detects the bit "1101" with a Mealy Machine. So I have made the following state diagram and state table(picture 1 and picture 2) http://img215.imageshack.us/g/picture1jf.png/" Now I don't know what happens in picture 3. How...

hello, in Penrose diagrams it says that once you have crossed a first Cauchy horizon(of a rotating black hole) , then, with the repulsive singularity, it is possible to cross another Cauchy horizon, and then another event horizon to escape the black hole and go into another universe. so I...

Hi, How can we represent covariant and contravariant vectors on curved spacetime diagrams? How can we draw these vectors on a spacetime diagram? Contravariant vectors are really vectors, therefore we can represent them on the diagram with directed line elements. Covariant vectors are...

Where can I find phase diagrams for things other than water or CO2? I'm looking for pressure/temperature ones.

1. A frictionless surface is inclined at an angle of 34.4° to the horizontal. A 270-g block on the ramp is attached to a 75.0-g block using a pulley, as shown in the figure below. (a) Draw two free-body diagrams, one for the 270-g block and the other for the 75.0-g block. (b) Find the tension...

Homework Statement In the attachments, you will see the problem and my answer. Is my answer correct?

I'm working on a "draw all possible Feynman diagrams up to order 2" problem for a scalar field that obeys the Klein-Gordon equation, and I'm wondering about a few things. When I did a course on particle physics and was first introduced to Feynman diagrams in the context of QED (but not QED...

http://img689.imageshack.us/img689/511/pistonquerstion.jpg This is my part attempt... [PLAIN][PLAIN]http://img830.imageshack.us/img830/7342/internalenergyanswer.jpg And ideas on how I can do the rest of it?

I was suddenly confused by the calculation of symmetry factors of Feynman diagrams. For example, in Peskin's textbook, as the attached pdf file, Below eq(4.45), he calculated the symmetry factor in detail, however, I was confused by the last 1/2 factor. I'm trying to realize this...

Can you recommend a good book or pdf file to learn how to draw Penrose diagrams in general cases? It is possible to draw "precise" well-defined Penrose diagrams for every spacetimes?

I apologize for not using the template, but my question is more of a conceptual question than anything else. The only thing so far that confuses me with Shear and Bending Moment Diagrams is when, in some cases, it is easier to approach the beam from the right side instead of the left...

Homework Statement Ok, so I'm in college now. However, I'm having the same problem i did when I was in high school. When your doing a problem that has let's say a truck on a 30 degree incline, how do you decide whether that angle will be touching the y component of the angle or the x? The...

Say you want to evaluate this integral: \int^{\infty}_{-\infty} \frac{dx}{x^2-A} Since the bottom factors into \frac{1}{(x-\sqrt{A})(x+\sqrt{A})} , using the theorem of residues, the integral is \pm 2\pi i (\frac{1}{2\sqrt{A}}) (where \pm is + if Im \{\sqrt{A} \}>0 and - otherwise, but...

Vincent Rivasseau and four others just posted "July3150" (I mean 1007.3150, just easier to remember that way for some reason) where they made the observation in effect that spinfoams are the Feynman diagrams of GFT. It's not a new thing to point out, but it is very helpful to mention...

Homework Statement The ski supports the 900N weight of a person. If the snow loading on its bottom surface is trapezoidal determine the intensity w (N/m). Draw the shear and bending moment diagrams for the ski. The ski has an overall length of 2m. The force arrows 'hang' of the bottom of...

*Hope this is in the right forum* This upcoming semester I'll be taking my first course in Semiconductor physics and I'm studying out of the textbook independently this summer to prepare myself. I've been learning about energy bands and I wanted to clarify a couple of concepts that my text...

I hope this is the right forum to ask this question. I am looking for a Latex package that is able to draw Braid diagrams without too much trouble. See for example http://arxiv.org/abs/0707.1889v2" (figure 2, page 3). Any suggestions? Thanks in advance.

Hi everybody,i'm worried about some calculation. I have to write down the amplitude for the neutral Kaon oscillation. There are two Box diagrams which are depicted here: http://upload.wikimedia.org/wikipedia/de/9/92/FeynmanKaon.png The two diagrams come along with a combinatorical factor of...

Does anyone know where, on the internet, I can find a bunch of the diagrams from the book? Google images didn't really have any decent sized ones.

Here I have a question which I'm unfamilar with. I'm not sure how to answer the question by explaining what is involved with the diagram. Discuss the following pictures in terms of work and power outlining any assumptions that you make.

Homework Statement The entering class in an engineering college has 34% who intend to major in mechanical engineering, 33% who indicate an interest in taking advanced math as part of their major field of study, and 28% who intend to major in electrical engineering, while 23% have other...

[PLAIN]http://img20.imageshack.us/img20/4083/minkowskidiagram1.jpg B is meant to have occurred before C in the S' frame, but I don't get how it's possible.

Homework Statement Solve for the unknowns. http://img535.imageshack.us/img535/7494/24800354.png http://img517.imageshack.us/img517/5765/33984576.png [PLAIN][PLAIN]http://img707.imageshack.us/img707/2511/75290122.png [PLAIN][PLAIN]http://img96.imageshack.us/img96/2593/40824092.png...

Homework Statement http://www.maths.ox.ac.uk/system/files/private/active/0/b07.2_c7.209.pdf Q1 (Also in Q2, what is the definition of 4 momentum for a massless particle?) The Attempt at a Solution I can do the entire question if I first derive the Lorentz transformation but I...

Hey all, here is a simple problem provided as a review for our final by my professor. I think I have everything right, but if history offers any insight into the future, I'm dead wrong. Any help is greatly appreciated.Homework Statement A 30kg box sits on a 10kg wagon. the wagon is pulled by...

Homework Statement I need to draw a series of Feynman diagrams to show some processes, but I'm unsure if I'm doing these correctly. I've put them together in this one post and detailed each below in turn, hopefully this is going to make sense. I know there's a few, but I want to make sure I'm...

I'm learning how to do Feynman diagrams for an exam coming up, and have come across diagrams in both position and momentum space. If I'm asked to draw a Feynman diagram without specifying which kind, is it generally assumed that it's in position space? If I label the the incoming and outgoing...

Homework Statement draw a circuit diagram for a single circuit with the following conditions: a. resistor one is in series with resistor 2 and 3 b. resistor 2 and 3 are in parallel with each other c. capacitor one is in series with resistor 1 d. a voltmeter is used to measure the...

I have a two point Green's Function with a phi^4 interacting Hamiltonian and am considering the second order of pertubation, and must work out the following: T[\phi(x_1) \phi(x_2) \phi(y_1)^4 \phi(y_2)^4] = T[\phi(x_1) \phi(x_2) \phi(y_1) \phi(y_1) \phi(y_1) \phi(y_1) \phi(y_2) \phi(y_2)...

I have spent a while trying to get to grips with the building blocks used for constructing feynman diagrams, below is my attempt at a set of reactions, how am I doing so far? I don't think e^{+}e^{-}\rightarrow\mu^{+}\mu^{-} can happen since a gluon only interacts on particles with a...

Can anyone explain how the convolution and deconvolution of phase diagrams are described?

I need detail explanation and if possible diagrams on optodecoders,optoencoders,optocouplers and optoisolators. thank you.

Hello there , I don't know how to draw free body diagrams , so can u illustrate to me how to draw an FBD for an object sliding down a ramp like this one. http://ffden-2.phys.uaf.edu/211_fall2004.web.dir/Jeff_Levison/freebody_diagram.jpg illustrate this in details , please Thanks

Homework Statement In a series circuit V = V<0 @50hz with an R and C, show that the graph of the loci or the port impedance, Z, and port admittance, Y, as the resistance R is varied from 0 to inf ohms are as shown. http://ivila.net/prob.pnghttp://ivila.net/loci.png Homework Equations The...

Suppose you have an question like: "In the t-x spacetime diagram of O, draw the basis vectors \vec{e}_0 and \vec{e}_1 Draw the corresponding basis vectors of \bar{O} , who moves with speed 0.6 in the positive x direction relative to O. Draw the corresponding basis vectors of...

Homework Statement Homework Equations The Attempt at a Solution I know how to work shear and moment diagram problems, but I am a little confused as to how to start this one. Does it matter that the force is hanging off the bracket? Can I just continue as if the force was acting...

Hi, Could you please advise me any software (and location) to draw Feynam diagrams? I knew one softare Feyndraw but lost it... Thanks

Homework Statement Draw an argand diagram to represent the follwing property: real(z) < abs(z) < real(z)+img(z) Homework Equations z = x+iy; real(z) = x abs(z) = sqrt(x^2 + y^2) img(z) = y The Attempt at a Solution substituting original expression with x, y, and sqrt(x^2 + y^2)...

Homework Statement A cylinder with a piston contains 0.250 mol of oxygen at 2.40  105 Pa and 355 K. The oxygen may be treated as an ideal gas. The gas first expands isobarically to twice its original volume. It is then compressed isothermally to its original volume, and then it is cooled...

Sorry I am spamming the forum, but I have yet another question on Feynman diagrams - Please see attached picture. Apparently the symmetry factor for this FD is 1 - I am trying to understand why. My notes explain that "the symmetry factor is 1 because: φ(x1) contracts to φ(y1) in 4 different...

Homework Statement A box of mass m2=3.5 kg rests on a frictionless horizontal shelf and is attached by strings to bodes of masses m1 = 1.5 kg and m3 = 2.5kg. Both pulleys are frictionless and massless. The system is released from rest. After it is released, find (A) the acceleration of each...