Components Definition and 911 Threads

Hey can someone explain the significants of the different components of the Compton spectrum? I know that the Compton edge comes from the incident angle of the photon approaching 180 degrees and that its the maximum energy that can be transferred from the photon to the electron without reaching...

Homework Statement I wanted to show that a particular wave is composed of the 4 frequencies W = W0 +/- W1 +/- W2 The equation for this FM wave is y(t) = Acos(W0t+W1COS(W2t)t ) I tried showing the different frequency components by performing a Fourier transform on the equation y(t)...

Hi, I need to make a demonstration that shows that white light is composed of different colors. I do not have a prism, and will not be able to obtain one in time. I have a white LED flash light, and I tried some improvisations with different objects (bottles, glasses etc), but none seems to...

Homework Statement I badly needed an urgent help in Matlab. I have to create a Matlab function (M-File) that will output the low (flow) and high (fhigh) frequency components of a DTMF signal given the numeric symbol (x) (* and # not included). I don't even know where to start since...

What is this ( the black colour one )?

For n \geq m \geq 0, V is an m dimensional subspace of \mathbb{R}^n and X=\mathbb{R}^n \backslash V. Let \pi_0 ( X ) = X / \sim be the identification space of X where x_0 \sim x_1 if there exists a path \alpha : [0,1] \rightarrow X with \alpha(0)=x_0, \alpha(1)=x_1. I'm asked to find the...

Homework Statement An amusement park ride consists of a rotating circular platform 8.07m in diameter from which 10kg seats are suspended at the end of 2.87m massless chains. When the system rotate, it makes an angle of 37.3\circ with the vertical. The acceleration of gravity is 9.8m/s^2...

Homework Statement Find the length of the path traced out by a particle moving on a curve according to the given equation during the time interval specified in each case. r(t) = (c2/a)cos3t i + (c2/b)sin3t j where i and j are the usual unit vectors, 0 \leq t \leq 2\pi, c2 = a2 - b2, and 0...

Homework Statement 20m 52deg W of N Homework Equations trig functions The Attempt at a Solution I got 20cos52=12.3m west and 20sin52=15.8m north yet the answer in the book says 12.3m north and 15.8m west. I don't understand...I thought cos was the x component and sin was the...

Homework Statement question 2 http://web.viu.ca/hearnd/Courses/Phys121/F02Test2/Page%201.htm" The Attempt at a Solution I have been trying to do question 2 on the practice test but I am stuck. I was trying to calculate the final velocities along each vector by using the equation...

Hi there, Having a bit of trouble working something out for a lab experiment at uni - not sure if this really counts as a 'homework' question - but if it does, moderators, feel free to move it there! So we've got linearly polarised laser light hitting a quarter waveplate to create...

Homework Statement Body A of mass 3 kg is moving int he x+ direction with a speed of 14 m/s. Body B of mass 4 kg is moving in the -y direction with a speed of 7 m/s. What are the x and y-components of the velocity of the CM of the two bodies? The answer is (6m/s,-4m/s). Homework...

I have just looked at a problem in an A level physics book which asks you to work out the forward force acting on a boat. There are 7 N of force going straight ahead and a further 5 N of force going 30 degrees to the left. In order to work out the forward force of the boat the book says this...

Excercise Exercise 1.6 of Roger Blandford and Kip Thorne's online textbook Applications of Classical Physics: "In Minkowski spacetime, in some inertial reference frame, the vector A and second rank tensor T have as their only nonzero components A0 = 1, A1 = 2, A2 = A3 = 0. T00 = 3, T01 = T10...

Homework Statement A simple one mark question which is doing my head in. 'There is a lorry traveling up a slope. Angle of slope is 46 degress with the horizontal and the weight of the lorry is 240000N. A resistive force of 1200N down the slope acts on the lorry as it travels up the slope at a...

Years ago, it was talked about how light could be used instead of electricity. How far have we come with this idea? Do we have today any kind of transistor/diode/capacitor version that uses light instead? I was also wondering if there’s such a device that looks like a solar panel, but is...

In the first problem here http://elmer.tapir.caltech.edu/ph237/assignments/assignment2.pdf , we're asked to show from the duality relation \mathbf{e}^{\mu} \cdot \mathbf{e}_{\nu} = \delta^{\mu}_{\nu} and the expansion of a tensor \mathbf{T}\left(\underline \quad, \underline \quad...

If in some frame I define a geometrical object as having 3 space components, how do I then find the time component component it must have? I've defined a geometrical object in some frame as having components Ax, Ay, Az defined by: d/dx Ax = Fx, d/dx Ay = Fy, d/dy Ay = Fy I require that...

The metric of Euclidean \mathbb{R}^3 in spherical coordinates is ds^2=dr^2+r^2(d \theta^2 + \sin^2{\theta} d \phi^2). I am asked to calculate the Christoffel components \Gamma^{\sigma}{}_{\mu \nu} in this coordinate system. i'm not too sure how to go about this. it talks about ds^2 being...

Homework Statement You throw a ball toward a wall with a speed of 32 m/s at an angle of 40.0° above the horizontal directly toward a wall. The wall is 22.0 m from the release point of the ball. (a) How far above the release point does the ball hit the wall? (b) What are the...

Homework Statement What is the derivate of the following equation? v(t) = \dot{r}\hat{r} + r \dot{\hat{r}} = \dot{r} \hat{r} + r \dot{\delta} \hat{e} where e is dependent on the angle, delta.The Attempt at a Solution My answer: We know that \hat{r} = \frac {r} {|r|} => \hat{r} = \frac...

Homework Statement You throw a ball toward a wall with a speed of 32 m/s at an angle of 40.0° above the horizontal directly toward a wall (Fig. 5-33). The wall is 22.0 m from the release point of the ball. (a) How far above the release point does the ball hit the wall? not sure what...

1. The problem A ball is thrown from a 19m building and hits the ground 98.2 m away. Gravity = 9.8 m/s2. Find the intial velocity as well as x and y components of the ball just before it hits the ground Homework Equations I found time=1.969149822.

Homework Statement A particle starts at t=0 at the origin of a coordinate system with a velocity of 1.32m/s in the negative y direction. There is acceleration on the particle of 2.47m/s^2 in a direction 35 degrees above the x axis. a) at what time does the y component of the particle's...

I am doing physics homework and I came upon a problem that I had forgotten how to do, and i do not believe my answer is correct. I have tried to Google this but failed, can you please tell me if i have done this correct? the question: "4. Give the horizontal and vertical components of...

I have a technical question about numerical relativity, hopefully someone can help. In the usual 3 + 1 decomposition in NR, the four gauge freedoms are expressed via the lapse, \alpha and three shift components \beta^i . In a finite element numerical scheme, each grid point will have a value...

Homework Statement With reference to Fig. 3 (not accurate), where the origin is at the centre of the image, if r1 = (0.10)î+(-0.80)j hat, and r2 = (-0.90)î+(0.10)j hat, what is the distance between the dots? Homework Equations Unsure. The Attempt at a Solution I'm not so good with these...

Homework Statement A radar station, located at the origin of xz plane, as shown in the figure, detects an airplane coming straight at the station from the east. At first observation (point A), the position of the airplane relative to the origin is R_vec_A. The position vector R_vec_A has a...

Homework Statement An airplane wishes to fly from A to B which is located 1000 km northeast of A. The maximum speed of the plane in still air is 650 km/hr. There is a wind blowing West of 40 km/hr In what direction should the pilot steer the plane to complete the trip as fast as possible...

Does anyone know of any sites where I can buy components like ICs or off-the-shelf stuff like resistors and capacitors in small amounts (<10, for example?). The only one I know of is jameco.com, and they don't have one of the ICs I'm looking for (LM2678T-12). Any others?

Homework Statement http://www.grabup.com/uploads/7800261909D120091B14DB13F106.png That's an image I have made of the diagram we are given. T1 and T2 are tension 1 and [/i]tension 2[/i] respectively. I need to work out the length of those by: a). Maths b). Scale Drawing Homework Equations...

Homework Statement A dolphin leaps out of the water at an angle of 32° above the horizontal. The horizontal component of the dolphin's velocity is 7.7 m/s. Find the magnitude of the vertical component of the velocity. Homework Equations Vy=V0y + a[SIZE="1"]yt The Attempt at a...

Homework Statement If Avec = (6.00 ihat -8.00 jhat) units, Bvec = (-8.00 ihat + 3.00 jhat) units, and Cvec = (26.0 ihat + 22.0 jhat) units, determine a and b such that a Avec + b Bvec + Cvec= 0. a= b= Homework Equations Avec + Bvec = Rvec Rvec = (Ax + Bx)i-hat + (Ay + By)j-hatThe Attempt at a...

Homework Statement http://img32.imageshack.us/img32/5364/325n.png The Attempt at a Solution I don't know how to approach this simple problem. I don't know what role A+B+C = -1.90i plays. Even if the vector of B is found, I don't understand how to find the components of B.

Homework Statement Vector C has a magnitude of 5.0 units and makes an angle of -90.0º with the positive x-axis, vector D has a magnitude of 7.0 units and makes and angle of –120º with the positive x-axis. What is the magnitude of the vector sum of C + D? - I am assuming that this means the...

Homework Statement Find the x, y, and z components of the vector A shown in the figure , given that A = 65 m. A link to the image: http://img401.imageshack.us/i/asdasp.jpg/ The Attempt at a Solution Y Component: 65m*cos(35) = 53.24m Z Component: 65m*cos(55) = 37.28m I think...

Homework Statement a ball is thrown up onto a roof, landing 3.90 s later at height h = 18.0 m above the release level. The ball's path just before landing is angled at θ = 67.0° with the roof. (a) Find the horizontal distance d it travels. (Hint: One way is to reverse the motion, as if on...

My question concerns my understand of the mechanics of the absorption of Photons by the components of atoms. I will use a common real-world example to facilitate my understanding of the concept. 1. When a rock (for example) sits in the sunlight, the rock warms to the touch. I believe this...

Help! I am losing my mind over this problem (which is basically problem 2.6.5 in Arfken and Weber Mathematical Methods for Physicists, sixth edition). I am having difficulty using the tensor symmetric and antisymmetric relationships of the Riemann-Christoffel tensor to show that it reduces...

Hey guys! I am back for a second time. (Woo) More Awesome Physics underway! Homework Statement The components of a vector V are often written (Vx, Vy, Vz). What are the components and length of a vector which is the sum of the two vectors, V1 and V2, whose components are (3.4, 1.0, 15.0)...

Homework Statement A room has dimensions 2.95 m (height) × 4.68 m × 6.19 m. A fly starting at one corner flies around, ending up at the diagonally opposite corner. (a) What is the magnitude of its displacement? (b) If the fly walks rather than flies, what is the length of the shortest path...

Is anyone familiar with materials which possesses a high tensile strength, but also a low young's modulus (high compliance)? I'm interested in a material which can support large deflections, while offering minimal resistance to it. Also, I'm specifically not interested in non-linear materials...

Homework Statement A 2.0kg object's momentum at a certain time is 10kg*m/s 37degrees vertically upward from due west. What are the components and magnitude of its velocity vector at this time (in a frame in standard orientation)? Homework Equations P=mv imp= dP The Attempt at a...

[b]1. A vector is 40.0 m long and makes an angle of 50.0° counterclockwise from the y-axis (on the side of the -x-axis). What are the x- and y-components of this vector? [b]2. Homework Equations Sin = opp/hyp Cos = adj/hyp [b]3. I tried solving for the x and y components of the...

Hi everyone! I am trying to self- study GR and I am (very slowly) working through Schutz at the moment ( not the clearest at times for a " first course" text). Anyway I have noticed that several times when working with components of physical variables e.g. momentum/ energy, the 'up' index in say...

Homework Statement You will be hiking to a lake with some of your friends. the map says you will travel 1.6 mi north then 2.2 mi in a direction 35 degrees east of north, then finally 1.1 mi in a direction 15 degrees north of east. how far will you be from where you started and what direction...

Given: at 70 pounds <60.02, -35> at 40 pounds <28.28, 28.28> at 60 pounds <-42.43, 42,43> now add the components to find the resultant of the system and use it to find the magnitude and direction angle. ----------------------> can anyone please explain it to me how to add the...

Hello, Can any experts give me some advice on the selection and calculation of infrared in control. I want to do a simple sensor control by PLC which utilize the infrared.When the receiver detects the infrared from the transmitter, the signal will trigger the PLC for some form of control...

Hello, for technical reasons I'm looking for a schematic of an Op Amp built with discret components and having GBP over 30 MHz.

What is the difference between, - Alternators - Generators - Dynamos - Rotors - Stators - Armature - Field - Commutators - Brushes. My mind is filling up with terms and I am struggling to make sense and define the difference between each! your help is appreciated.