Diagrams Definition and 659 Threads

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...

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...

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...

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

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...

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...

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?

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...

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

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.

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

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 \}...

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?

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

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

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...

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...

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...

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"...

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...

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...

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...

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...

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...

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.

How to do that?

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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

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...

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...

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...

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...

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...

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...

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...

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...

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...