Graph Definition and 998 Threads

Hi all, If you are given the real space lattice vectors (14 Angstroms in the x-direction and 8 Angstroms wit an angle of 91 degrees between them) and have to draw the reciprocal lattice and the the first Brillouin zone, and then using this data sketch the E-k graph and comment on the band-gap...

Hello everyone! I'm stuck on a small detail in a math task, and would really appreciate some help! Homework Statement Determine all local extreme points and possible max/min values for the function f(x) = x*lnx+(x*lnx)^2 where 0<x≤1/2 Homework Equations The Attempt at a...

So, I've obtained a graph of lab data an it's a plot of thermal resistance versus pressure. Pressure on the x and thermal resistance on the y. If I plot all the points, there doesn't seem to be any trend. The y values are just as likely to decrease as they are to increase with increasing x...

Find g(-1) = So wouldn't g(-1) = Does not exist since the point is discontinuous or would it be 1.5? I'm confused. I feel like it doesn't exist. Can someone elaborate? - - - Updated - - - because g(2) = Does not exist, because it is discontinuous, so g(-1) has to be Does not exist right??

The problem I am currently trying to right a lab report on a experiment trying to find a flywheels moment of inertia. In the lab we had a fly wheel connected to a mass on a string, and measured the position of a point on the wheel as the mass was accelerating downwards. The data was analysed...

The two charges are (-q) and q. I'm just curious as to how you go about graphing them. Thanks!

On The graph, the following information was given: Point of discontinuity( -2,0) and (1,-3) X intercept at ( 2,0) Yintercept (0,-4) This is what I had : (x+2)(x-2)(x-1)/ (x+2)(x-1) But the answer is that u have to put (x+2)^2 in the numerator instead of what I had. But I thought...

I just recently discovered for myself this weird graph, can anyone explain to me what is exactly happening here. I realize there are a couple asymptotes but I am confused on when when y<0 the "legs" of the graph converge on another asymptote it looks like the tan(x) is just repeated but flipped...

Hello, How can I determine when the current is starting rise? What methods should I use to do so? on excel or matlab. I've attached an image of my graph below Thanks a million

Homework Statement Homework Equations Area of a triangle is 0.5 × b × h ΔW=VΔQ The Attempt at a Solution I drew a straight line graph from the origin with end point 4.5V 9.0 microF energy is a work done = .5QV There is a mark in the mark scheme for ΔW=VΔQ explained...

Homework Statement I've been looking at the problem for a while and I just can't figure it out. It is graph sketching. y=x2(x2-4)2 the correct equation is this: y=x2(x-4)2Homework Equations Solve for critical points, and inflection points in order to get points needed to graph function. The...

Mg=[1600∏2m(L+a)(1/t2)]- b M is the mass of the slotted weight g is the gravitational force m is the mass of the sticky tape L is the length of the nylon thread measured from the end of the plastic tube to the sticky tape t is the time for 20 revolutions of the sticky tape a and b are...

Hi, I was trying to plot two sets of data on the same graph and this was my solution but this generates a graph with the x-axis in 0.5 increments where I wanted 1. How do I plot two sets of data on the same graph and customize the increments. Thanks in advance. Also, how would I make MATLAB...

I posted the divergence of this earlier but thought I should post the curl separately. Homework Statement Find the curl of ##E=-Cx\hat{z}## Homework Equations...

So,here we have a graph.For every unit of 1(x axis),the unit of the previous y-axis is multiplied. Like this. (0,2),(1,4),(2,8),(3,16)... I don't know how the formula will be,and had never seen this kind of graph. The y seems to be a geometric sequence,on which we can use, ## ar(n-1) ## .r is...

Homework Statement Hello! I have two graphs which I need to find if there is relationship between them (all in one). I have to create a formula/equation that can show and prove that there is this relationship between them.I am really confused at the moment since I do not know if there is...

This is an experiment on plasma control. A graph of current against voltage is drawn on a semi log paper. From this graph, we can get the electron temperature (measured in eV). The method is shown in this picture, but I don't understand it at all. Can someone please explain it to me?

(HgAh)=ChG^mL^n (HdAm)=CmG^pL^q I need to plot (HgAh) and (HdAm) As Fuction of G( Gas flow rate) with lines of Constant L( Liquid flow rate) and discern M and P from the equations above from Log Log Graphs. I have collected a table of raw data with Various G at constant L. How do I...

How do I go about doing this? I'd like the graph to be fitted to the size of the page (A4) also, not just stuck on at the end in full size.

[solved] graph of potential energy Homework Statement A mass of 5 kg follows the potential energy shown by the equation: U(x) = .333(x-4)^3 - \dfrac{x^2}{4} + 5 1. Find the force on the mass at x=2 2. Describe the motion qualitatively if the mass is placed at x=4 m and released 3...

Graph Theory -- Max. Independent set algorithm Homework Statement Design a polynomial time greedy algorithm to compute a maximum independent set for a graph. Explain the algorithm and compute T_w(n). Homework Equations The Attempt at a Solution My terse and informal...

I have the following problem, suppose we have a graph G of n elements, with the property that if we add one missing vertex v, we will get a complete subgraph with s elements K_s of G, in which v belongs to G'. In other words every subgraph of s elements of G is almost a complete graph except for...

I was given a rather complicated graph as a homework problem, and told to see if it is planar or not. It satisfies the equation $$e\leq 3v-6$$ and has a chromatic number of 4 as well as vertices of degree 5 or below, so there's nothing to rule out planarity there. There are at least 5 vertices...

[b]1. The problem statement So I am currently working on an velocity/acceleration lab. My physics teacher requires each lab group to find an extension that goes above and beyond the question that we are supposed to answer with the lab. Each group also needs evidence to prove the extension...

Homework Statement By use of the graph in part (a), calculate the gravitational field strength at a distance 2R from the centre of the Earth. Homework Equations g = delta V / Delta r filed strength is the potential gradient The Attempt at a Solution I have drawn the...

Hi, I don't really understand the graph of y2=x2. When I plot it in wolfram alpha, I get a plot that looks like an x or two diagonal intersecting lines that go through the origin. I can understand why there are points in the first, second, and fourth quadrants, but I am confused as to why...

If you've followed loop-gravity research since 2011 you know there've been big changes in the past couple of years--one being the emergence of the spinor network formulation. Livine, Wieland, Speziale are some of those involved. I see Etera Livine is a visiting fellow at Perimeter as well as...

I'm looking for a graph that shows me the root mean velocity as a function of temperature for helium gas. Does anyone know where I can find this? Thanks.

Which of the following is true if the mass is at rest at t=0 ? A. Velocity of the mass is decreasing btwn 10 and 20 seconds. B. The accel. of the mass is constant between 0 and 10 seconds C. At 40 seconds the mass is stationary. D. The distance trsveled by the mass bten 0 and 10 seconds is...

Hi there, It's the first time I am using gnuplot to plot a graph and I watched all sorts of tutorials and advices on google but I just can't find a good solution! Let me try to explain what the problem is... The experiment: I have a microphone and a speaker in closed box. The speaker is...

Homework Statement Hello there. I ran a MATLAB program and i can't produce any graph. Please help me Homework Equations This are the program L = 1.; T = 1.; maxk = 2500; dt = T/maxk; n=50; dx = L/n; cond = 1/4; b = 2.*cond*dt/(dx*dx); for i= 1:n+1 x(i) = (i-1)*dx; U(i,1) =...

Homework Statement Please refer to the image attached. Part (ii) Homework Equations NoneThe Attempt at a Solution My workings are in the second image. I don't understand why is it wrong. Since the graph is well below the x-axis, if I integrate it do I get infinity? (The x-coordinates of P...

Hi friends, I have an issue in Analysis of collision of particles from graph. Please Help me in solving this. Thank you all in advance. The problem is as: https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-ash4/q71/s720x720/1381762_1432382976988808_995987085_n.jpg Attempt...

Hi MHB, I've come across a math problem lately and it seems so interesting to me but I don't understand the statement below, which caused me failed to think of a good method to solve it. "The line is tangent to the graph at exactly two distinct points." I understand that if we have a...

We are pulling a box with a mass = 8kg up a slope (ψ=30°). Force of a hand is given F(t)=F0*sin(Ωt). F0= 150N, Ω=(2*∏)/t0, t0=30s. After tf=15s we don't pull it anymore. a) Find average velocity at [t=12s to t=10s], current velocity at t=11s and v(t) before and after the end of pulling. b)...

If I'm graphing (3+4i)/25, would the x-point be 3/25 and the y-point be 4i/25?

I have no idea where to post this. How to graph |z| > 3 on the complex plane? A detailed explanation of how the graph shall look like would be very nice :D Thanks!

This is just a coursework question ( I didn't know where to post this). When I find the traces of an equation ( let's say x^2+y^2-z^2=1 for the sake of argument). How does it affect my graph if one part of the equation is an ellipse and the other is an hyperbola? I mean in this case I would...

Homework Statement The question is in regards to a homework problem, but I only need clarification on how to interpret the graph of a waveform. Homework Equations N.A. The Attempt at a Solution N.A. I've attached the image. I am assuming that one cycle of the waveform takes...

Hey all, Wanting to create an up/down counter that uses a photogate as a trigger, and a 12 segment LED bar graph to display the count. It will need to begin at full illumination, turning off one at a time on activation of the photogate. Will also need a reset switch, though I'm thinking a...

Homework Statement A firework rocket is fired vertically upwards from the ground. It accelerates uniformly from rest with an acceleration of 8.0 ms−2 for 5.0 s after which time the fuel of the rocket has all been used. Sketch graphs to show how the gravitational potential energy and the...

Homework Statement I have to calculate the displacements from a velocity-time graph to make a position-time graph. The velocity-time graph from the question is attached. Homework Equations d=vtThe Attempt at a Solution To calculate the values for a position-time graph, I first converted all...

Homework Statement Homework Equations ΔU = -q∫E * ds The Attempt at a Solution Just by looking at the graph I am thinking, if I solve for E using the equation above, the number would be always negative therefore I can conclude that the electric field at any x position would be negative and...

Homework Statement Prove that every graph G without isolated vertices has a matching of size at least n(G)/(1+∆(G)). (Hint: Apply induction on e(G)). Homework Equations n(G) = size of the vertex set of G and ∆(G)= maximum degree of v in G The Attempt at a Solution For the base...

can u describe this motion? how is x > 0 at E? how can we tell the sign of x from the graph?

A train starts from rest from a station and travels with uniform acceleration 0.5m/s^2 for 20s. it travels with uniform velocity for another 30s, the brakes are then applied so that a uniform retardation is obtained and the train comes to rest in a further 10s. sketch the velocity-time graph of...

Hello, I have a graph of a tensile test of a metal sample, and I wish to find the slope on the graph of only the elastic region of the graph, meaning of the entire graph, there is only one section of it that I am interested in finding the slope for. Is there a way in excel to make it such...

Homework Statement when graphing a velocity squared vs. time graph how do I find the acceleration. I realize the slope gives me units of acceleration but this is not correct because the theoretical acceleration is no where near this and I didnt botch this lab up. Theoretical a =...

Homework Statement Prove that if a graph has > (n-1)(n-2) /2 edges, it is connected. Homework Equations ?? The Attempt at a Solution I've drawn several examples and made tables, and I can see that the graph is indeed connected if it has more edges than [(n-1)(n-2)]/2. But...

Homework Statement The graph of acceleration versus time for an object in linear motion. Assuming the object starts from rest at the origin at t = 0, find the velocity and position of the object at times t = 1 through 10 seconds. Homework Equations ##v=v_i + at##The Attempt at a Solution I...