Diagram Definition and 1000 Threads

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...

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 ...

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...

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...

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...

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...

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...

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...

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.

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...

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.

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...

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...

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

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...

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

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...

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...

Homework Statement A 60 kg man stands in a 30 kg box on a light weighing machine. If the box is kept at rest due to force applied by the man by the rope , what is the weight shown by the weighing machine? Homework Equations The Attempt at a Solution .answer given in book is 15...

Homework Statement How would the free-body diagram of two 45 degree right angle wedges stacked on one another look like? (It is stacked so that the two wedges form a square) There is friction that is holding the wedges together. The wedges are in place and not moving. ___ |\ | | \| ----...

PLEASE! I need to find a pressure-temperature phase diagram por PURE methanol! it's driving me mad...

In my general relativity course my professor actively refers to the models in the lecture .pdf I have included as "The Robertson Diagram" and "The Ω\Lambda - ΩM Plane", respectively. I am not doubting that he is correct but I would like to do some additional reading on the subject and I am...

Homework Statement Identify all forces acting on the object and draw the free-body diagram. Draw the force vectors with their tails at the dot. The orientation of your vectors will be graded. The exact length of your vectors will not be graded but the relative length of one to the other...

Homework Statement A force of magnitude F= 7.30 N pushes three boxes with masses m1= 1.80kg, m2= 3.00kg and m3= 4.20kg, on a level surface. Draw a free body diagram showing all the individual forces acting on the system consisting of boxes 2 and 3 together. Indicate the directions of the...

In a nutshell, I am trying to see how to derive the conditions of coexistence between a solid and a liquid from a phase diagram. The situation is as follows: Consider a mixture of hard spheres of diameter σ. The potential energy for a hard sphere system is given by \beta U(r) = 0 (r > \sigma)...

Homework Statement Given = 5 - light bulbs Light bulbs 1 and 2 each dissipate 180 mW at 12 V Light bulbs 3, 4, and 5 each dissipate 45 mW at 9V. 1 - 12 V supply 2 - Resistors (Range 10-1000 Ω) 5- switches The design must meet the criteria: Each light bulb can be independently...

I would just like someone to check maths for this venn diagram, just to make sure I have done the calculations correct. I have attached copy, with the numbering inside the diagram. I will show my working here. Question: One of 36 tourists on holiday in Namibia and South Africa is chosen at...

In the figure below, m1 = 10.5 kg and m2 = 3.5 kg. The coefficient of static friction between m1 and the horizontal surface is 0.50, and the coefficient of kinetic friction is 0.30. I've drawn the free body diagram myself and labeled it but don't know how to structure the equations and stuff...

Homework Statement Helium gas is initially at a pressure of 16 atm, a volume of 1L, and a temperature of 600K. It is expanded isothermally until its volume is 4L and then compressed at constant pressure until its volume and temperature are such that an adiabatic compression will return the gas...

Homework Statement I have a shear force diagram and I am asked to find the magnitudes of the point loads and where are they situated My question is, what am I looking for to find the point loads in a shear force diagram? Homework Equations The Attempt at a Solution

hi there, I've got three chemical reactions I'm struggling to put into 3d. 1) CoCl2.6H2O + en.2HCL --> rac-[Co(en)3]Cl3.0.5NaCl.3H2O (using NaOH and H2O2 as catalysts) 2) rac-[Co(en)3]Cl3.0.5NaCl.3H2O + (+)Tartaric acid --> [(+)Co(en)3](+)tart]Cl.5H2O 3) [(+)Co(en)3](+)tart]Cl.5H2O +...

I would like to discuss different ways of creating the Campbell Diagram (from FEA results) used in dynamics. If you have frequency at bench (70F and zero speed) and frequency at the max speed (with temperature), you can either connect these two points directly by a straight line, or you can...

Hi folks, I was wondering if someone knows enough about the FormCalc package to help me out: I am using FeynArts to generate Feynman-diagrams for certain tree-level processes and FormCalc to calculate the squared amplitude of these processes (http://en.misho-web.com/phys/feynlecture.html gives...

Homework Statement Sketch the moore state diagram for the circuit shown in the figure, where A is the input variable. You may assume initially that Q[2:0] = 000. CLK = clock. The box with the & inside is an AND gate. Q[2:0] means that initially Q0, Q1, and Q2 = 0 and hence there...

First question is about connecting the signal inputs. If you look at pin 7 and 13 and 8 and 15 you see they are connected. I would read this to mean that the input voltages are combined with the supply voltages. This seems unusual. Am I reading it right? Where do I connect the actual audio...

Hello all. This circuit diagram uses empty and full circles and also no circles. Is there a difference between a white circle in this diagram and a black one? I'm referring to the typical application diagram. http://www.datasheetcatalog.org/datasheet/SGSThomsonMicroelectronics/mXqwvzw.pdf...

Hi, i'm studing the divergent/convergent behavior of some feynman diagrams that emerge from the study of luttinger liquid. One of this diagrams has a loop inside it and loop-integrals has the following form: \int_{-\Lambda}^{+\Lambda}dQ\int...

Hi, I was told that in order to analyze cycles, wave patterns etc in empirical data, the time frequency analysis using the discrete Fourier transform (or the fast Fourier transform) are most appropriate (instead of say the autocorrelation spectrum). Using the Python scipy.fftpack as...

Hi, I have a question about basic statics. I have heard from someone that the forces acting on a truncated cone in a hole of corresponding geometry is different from an ordinary block sliding down a wedge, since the normal force on one side of the cone will be affected by the normal force on...

Homework Statement Carbon dioxide (CO2) is an interesting substance. It has no liquid phase at normal pressure; it sublimates rather than melts, going directly from the solid form (dry ice) to a vapor. This sublimation occurs at -78.5°C with a latent heat of sublimation (similar to a heat of...

ok so here is the quesiton.. An object is loacted 3.5 cm from the optical centre of a lens. The lense produces an image of magnification that is +0.667 the size of the object a) is this lens a diverging or converging lens? explain b) Find the position of the image and the focal length...

Homework Statement As shown in the attachment, a free body diagram (FBD) must be drawn Homework Equations sum of horizontal force = 0 sum of vertical force = 0 The Attempt at a Solution 1. Forces F1 and F2 appear exactly as they are in the FBD 2. At point A, there is an outward horizontal...

hi i have this pV-diagram(ideal gas) and i am supposed to say something about the heat, internal energy and work transferred and done on these different paths( i have to bring them in an order like). i do not know how to do this, as this is a pV diagram and these paths are not further...

1. The problem statement, all variables and given/known Hi, this is my first post on here. Does an adiabat get steeper at higher temperatures? I think it does, but I wanted to make sure I'm thinking about it in the right way. Also, what is the constant in the PV relations...

Hi all, I am learning Feynman diagrams, and I have a quick question: in diagrams such as the one for electron-positron annihilation (see http://en.wikipedia.org/wiki/Feynman_diagram#Electron-positron_annihilation_example) why is it that the line "in the middle" is that of an...

feynmf returns "Feynman graph:\Delta", no diagram I recently installed the package feynmf for drawing Feynman diagrams (or at least I think I did -- my MiKTex Package Manager says so). When I compile\documentclass{article} \usepackage{feynmf} \begin{document}\setlength{\unitlength}{1mm}...

Homework Statement So, imagine that there are two wires stretched across 2 electrodes crossing over each other, dividing each wire into two pieces at a junction, j. Each wire is connected to two electrodes, one at each end. The pieces have resistances R1, R2, R3, and R4 and the resistance at...

Please look at the third circuit diagram from the link below http://www.allaboutcircuits.com/vol_1/chpt_2/7.html It says that there should be 10V between every point in the diagram. But shouldn't there be a difference in voltage value between points 1 and 2 and points 3 and 4? There's a...

Just want to ask if the moment diagram of Cantilever beam with fixed end at left is the same as with fixed end at right. What I mean is that they are just mirrored ? Thanks

when a cable car is stationary,it is in equilibrium.So the forces acting on it forms a closed triangle.(the vector diagram) Why is the triangle an isosceles triangle? I did this question on my paper and stumbled across this on the answers,couldnt figure out why hope someone could enlighten me!