Graphs Definition and 625 Threads

Hey all I am trying to generate a graph of a sinusoidally oscillation against time. However, the time itself is passing sinusodally, i.e time flows faster at some points and slower at others. I'm doing this as I need test data for a program I've written to decode real world data I'm...

I'm sorry I cannot conform to the default format Physicsforums.com; it is because I do not even know the first step to solving these sorts of problems, I don't know which equations to use which is a major problem. Here are the types of questions I require understanding. - An ideal gas goes...

I recently got (re)interested in C* algebras. Poking around, I gathered that there is some way of constructing a C* algebra corresponding to a finite graph. I'll put some links here in case anyone knows anything about this. At the moment I'm ignorant but hope to find out more. No idea in...

Homework Statement Which one obeys Hooke’s Law and why? For the material(s) that did obey Hooke’s Law, calculate the spring constant, k. SHOW ALL WORK: listed variables, units, equations without substitutions, equations with substitutions, final answer with units! The Green line on the...

Let g(x) be a function where g(0)=0, g(2)=0 and g'(4)=0. Which of the following is a possible graph of g(x)? (I have attached an image of the graphs) First, I immediately eliminated choice C) because g(0) isn't 0. I don't really get what that little apostrophe means in g'(4)=0. Is that like the...

Hi everyone! Homework Statement The potential energy U of a point mass is U(x)= Uoxo x/(x2 + xo2) where Uo and xo are positive contants, Uo in joule and x,xo in meters. Draw the graphs of U(x) and F(x). Homework Equations F(x) = -dU/dx The Attempt at a Solution I found the F(x) function...

Homework Statement I need to find the output voltage mathematically or graphically Homework Equations The Attempt at a Solution My approach : as long as the Vi is < 9.3 V , the diode D1 will be ON because in that case VA will be < 10 V and current can flow through 10k resistor...

please tell the output voltage mathematically or graphically

Can someone please explain how these graphs were obtained? There's no Hy in the equation given. Thanks in advance. http://snag.gy/utX7W.jpg

Homework Statement Hi everyone. I understand the basics of trig graphing; but am having a hard time understanding f(x) first of all what to f and x stand for? Above and beyond that any help understanding f(x) or a link to a website that might help me would be great. Homework Equations...

Homework Statement The figure below shows the velocity-time graph of a train that starts from the origin at t = 0s a) Draw a position-time graph and an acceleration-time graph for the train b) Find the acceleration of the train at t = 3.0 s Homework Equations a = Vf - Vi / t...

Hi, I have included a sketch drawing of a graph that I am not entiry sure is correct for what I am trying to do? I have found the exact values of Sin, Cos and Tan of some given values in radians, and am asked to use the symmetry of graphs of sin, cos and tan to find the exact values of some...

Hi I'm an AS student studying physics and to everyone else this question may be very easy but I'm unsure about this graph and how to describe it I think it's increasing acceleration but in a different direction , is that right?

question: "In laboratory experiments, graphs are employed to determine how one measured variable depends on another. These graphs generally fall into three categories: linear, semilog (logarithmic vs linear), and log-log. Which type of graph listed in the third column below would NOT be the best...

Consider the equation dy/dt = alpha - y^2 a) Find all of the critical points. How does it change as alpha < 0, alpha = 0 or alpha > 0? b) In each case of different alphas, consider the graph of f(y) vs y and determine whether each critical point is asympototically stable, semistable, or...

Homework Statement I have a problem where I am given the model: x(t) = 2.5 - 2t + 0.8t2 From this I have to determine the x vs t, v vs t, and a vs t graphs. I have to do this without plotting points. Specifically it says, "Draw the graphs by identifying and interpreting the...

I'm planning to work on a water cooling device for physiotherapy using a peltier. For this, I should be able to cool 500 g of water at a temperature of 35°C to 18° C. This gives me a heat load of 315 Watts if I take time to be 3 mins. Is it possible for a peltier to work against such a...

Hello, I'm trying to read a paper titled "Cluster Identification in Nearest Neighbor Graphs". It's a mixture of probability, graph theory, and topology. I'm having difficulty interpreting some of the ideas, specially when it comes to k nearest neighbor graphs. I've been trying to look for a...

I have a bit of a misunderstanding with;y = (x - 2)^2I understand it to be a quadratic, and if I used the formula to work it out I would see two roots,x = - 2 or x = 2 If I put the above equation into a graphics calculator the result is always x = 2Looking at the equation above I could just say...

Homework Statement An object moves up and down an inclined, frictionless surface. 1) Draw a Velocity-Time Graph of this situation. 2) If there was friction, how would it impact the graph? Homework Equations Ek = 1/2 m v^2 Eg = mgh Ek = Eg I don't think the equations are necessary...

If I want to make sum over graphs why I must have only loops? Why I must disslolving knots?

The question is: "How can you tell from a velocity-time graph that you are moving in the negative? I don't believe a velocity-time graph reveals that sort of information. Can't you only determine when the direction of motion has changed?

I have 10 sets of data which I have to analyze. The data represents a change in voltage over time and I want to come up with an "average" curve to represent the 10 sets of data. The problem is that the time index for each data is different so I can't simply average the voltage. Is there any...

When plotting graphs in polar coordinates, how does one know when to make the graph sharp (at θ=0) (as in for the graph for r=1-cosθ) as opposed to a dimple (r=3/2 + cos θ) ?

Homework Statement "In the following a<b<c are finite positive constants. One mole of an ideal monoatomic gas, initially at volume Vi and temperature 1000K, expands to a final volume cVi in 3 reversible steps: (1) isothermal expansion from Vi to aVi (2) adiabatic expansion from aVi to bVi (3)...

I don't understand this very well...

I am learning LaTex and I was wondering if there's a way to create graphs and figures with it. Even if it's not as simple as just typing graph sin(x) somewhere. I've been reading online about it and I think you actually can't, but then again I see documents like these...

Hello everyone, I found on this website http://spiff.rit.edu/classes/phys213/lectures/lenz/lenz_long.html a very good explanation for AC generators. Particularly I am considering these two images: And I found those equations and graphs are quite interesting and wish to make a...

Homework Statement f(x)=x2-1 and f(x)=2x+2 Homework Equations The Attempt at a Solution Points of intersection are -1 and 3. So you integrate using those as upper and lower and plug it in and subtract, right? But I get 0 for each. So nothing to subtract and 0 is not the correct...

I would like to draw plots by hand. Which means I can create the plot, label the axes, and then draw lines on it without having to write their equation. I can also control how the plot looks visually, such as color, scaling etc. What program can I do this with? More specifically, can I do...

Homework Statement a)Calculate the work performed by an external agent to move a charge of -0.39x10^-12 C from `i' to `b' http://capa-new.colorado.edu/msuphysicslib/Graphics/Gtype54/prob04a_threeqcontour.gif Hint: The equipotential lines shown are separated by 1 kV. Work to move a charge is...

Hello people, i am an undergraduate student on computer science (so i don't have a strong background in physics) and i am very interested in quantum mechanics and its affection the way we see information. I am studying for my "thesis" (well it's not exactly thesis when you talk about...

Dear friends What is the difference between B-Spline curve and Bezier curve? Regards Govind

On a bipartite graph a game of cat vs mouse can be played, with say both the cat and mouse starting on a "red" vertex. We colour the vertices so that no two of the same colour are connected by an edge (can always be done with a bipartite graph of course). The game is played by cat and mouse...

The 5-sigma event that denotes the "discovery" of the Higgs refers to a spike around 125 GeV against some polynomial curve fit against the data? and what is events / GeV - what are the other events at the various energy levels?

This is a graph from an article from last November on the search for the Higgs with the Atlas detector. It shows the cross section for a Higgs process relative to the standard model prediction. And then the upper limit of this, at the 95% confidence level. And this for different Higgs...

What would be the shape of an "Activity versus Number of Atoms present" graph look like... We know that A=-λN ... They are propotional but there is a negative sign.. What would be the graph?? Thanks in advance!

Hi, what would be the relationship between the product of pressure and volume (pv), against pressure. How would you represent it on a graph?, I have heard that the shape will be a horizontal line. Could someone please show an example or explain it to me?

Homework Statement I'm looking for graphs or other sources of uncertainty principle visualization (I'm suppose to use a Fourier transform to solve it and present visualization in MS Excel... but one thing at a time). Homework Equations The Attempt at a Solution Digged google in 3 languages. I...

Hello there, I have 2 questions: 1)What's the difference between the load line graph of a circuit having (a DC supply, diode with no internal resistance, and a resistor R) & another circuit having (a DC supply, diode WITH internal resistance, and a resistor R)? 2)If we have a circuit...

Homework Statement http://img444.imageshack.us/img444/3062/firing.jpg (in Hebrew it says "circuit to regulate firing angle") 1) Note the main difference between SCR and TRIAC. 2) The following is a circuit to regulate the load RL, regulated by SCR. The SCR is fired at an angle of 90 degrees...

Homework Statement A potential energy function is given by U(x) = 4x^2 and I found the total energy to be 7 J. They ask: Graph position vs. time and kinetic energy vs. time using this information and assume that the particle has an initial position of 0. The Attempt at a Solution I got the...

Homework Statement Prove that for a simple, connected, planar graph, 3f ≤ 2e where f = faces and e = edges The Attempt at a Solution My professor went over this in class, and mentioned something about "double counting," which I do not really understand. I tried saying that it takes 2...

Is there any good software which plots 3d graphs and vectors. I just want to plot linear 3d graphs and vectors in 3d. I don't mind paying for this but it should be reliable and easy to use.

I've a graph similar to a 1/x^2 function, but it's only represents positive X values. The Y axis represents the duration in seconds, and X represents the number of objects. This graph shows that, as the number of objects grows, the time decreases. If I want to represent this graph in a semi-log...

I have a set of measured data. I need to plot this in MATLAB and show two graphs in one plot. Data for first graph is : [0.35,0],[0.4,130],[0.45,400],[0.5,0.11],[0.55,34] and so on. Second graph is a function. So, how to plot sequence of data in matlab? Which command should I use?

Hi all I have a confusion regarding a physics concept. When you consider area under graph (velocity time graph), if the area is below x axis, is the area considered to be negative? For example, look at the attachment. There are 2 shaded areas. Let the area above x-axis be A and area below...

Homework Statement ...Bounded by graphs of equations: z=xy, z=0, y=x, x=1 I don't know what z=xy is. The rest of boundaries are clear. I assume that when y=1 and x=1, z=1. But, is this a z=1 plane? Check my figure attached. Thank you. Homework Equations The Attempt at a Solution

Homework Statement How many complete bipartite graphs have n vertices? Homework Equations The Attempt at a Solution I said, let the first bipartition set have x vertices and the second bipartition set have y vertices. So x+y=n. I think that you would do C(n, x)*C(n-x...

I think this is probably the right place to put it, didn't really fit anywhere else. I've got the joyless task of writing a lab report at university and need to put a graph in it, ideally with error bars. I don't have a problem with error bars normally, but I'm coming unstuck about what to do...