Source Definition and 1000 Threads

Hey Folks Quick disclaimer: I have no background in physics whatsoever but I have found myself trying to solve a problem that is seemingly based in physics so I am trying to learn. I also have a background in search and search engine optimisation which usually means I am a dab hand at...

Homework Statement five branches left most branch: 50 Volt source second left most: 10 ohm resistor shared branch between the second left most branch and center: 10 ohms (Voltage drop from left to right= V delta) center branch: 30 ohm resistor between center and second right...

Homework Statement http://imageshack.us/a/img15/7218/sg2prob11.jpg Find the Thevenin resistance for the network(Sorry for the bad drawing, but that is a point like point / node A on the bottom where it's going out too and likely part of the load too, with a wire connected to the circuit, I'll...

Homework Statement Please help me to solve this type of circuits... I want to find the intensity through each power source and what voltage does the voltmeter indicates. http://iceimg.com/i/f5/1d/2da68fc0a6.png Homework Equations I=I1+I2 The Attempt at a Solution don't know

I want to get some opinions on what the source of dark energy is? I think there are basically two camps here. One camp says that dark energy originates from space itself, it is some perturbation in the quantum field whereby one cubic meter of space becomes 10 cubic meters somehow, and so on...

Homework Statement http://imageshack.us/a/img26/8403/homeworkprobsg28.jpg a. Use source transformations to find the voltage V0 in the circuit (green). b. Find the power developed by the 250V voltage source c. Find the power developed by the 8A current sourceHomework Equations V = IR KVL...

Homework Statement 3 branches, Indpendents are a 15 Volt source (left most branch) in series with a 2 ohm resistor (current that flows from left to right though this resistor is 'i delta'), Middle branch contains a 5 ohm resistor in series with a current controlled voltage source (3 ohms * i...

Do any of you look at source codes from websites, do you write source codes?

Greetings to all, I know activity for a Am-Be neutron source. I want to compute strenght source in neutrons/s. Yours advices are welcome. Thank you!

Homework Statement By integrating (2-55), over a small volume containing the origin, substituting ψ = Ce-jβr/r, and letting r approach zero, show that C = 1/4π, thus proving (2-58). Homework Equations (2-55): ∇2ψ + β2ψ = -δ(x)δ(y)δ(z) (2-58): ψ = e-jβr/(4πr) The Attempt at a...

Homework Statement By integrating (2-55), over a small volume containing the origin, substituting ψ = Ce-jβr/r, and letting r approach zero, show that C = 1/4π, thus proving (2-58). Homework Equations (2-55): ∇2ψ + β2ψ = -δ(x)δ(y)δ(z) (2-58): ψ = e-jβr/(4πr) The Attempt at a...

Hello all, I'm having a bit of a difficult time following a specific conversation that I had with one of my professors. Occasionally, we would be given a 3-phase load (balanced or unbalanced), with merely the wires shown (the formation of the sources was not revealed. See the image below. I...

Homework Statement Design a circuit based on the noninverting op-amp configuration that functions as a 1mA ac current source. Homework Equations Gain = Vout/Vin = 1 + R2/R1 The Attempt at a Solution I really don't know how to start.

Homework Statement http://imageshack.us/a/img26/4592/homeworkprintprob.jpg Find the voltage V0 in the network.Homework Equations V = IR Voltage Division: (Voltage across series resistor) = [(resistance) / total series resistance)](total input V) Current Division (for 2 parallel resistors)...

I'm trying to get a better understanding on how grounding, bonding, and earthing works when high voltage sources interact with lower ones. For example, if you have a 400V AC, 20V AC, and 5V DC source all stored in the same aluminum cabinet (surrounded by a faraday's cage and connected to earth)...

I need some kind of environment in Latex where you can write whatever you want without it interpreting it. The reason is I need to include a MATLAB code. Most places I go says I have to use the lstlisting environment, but that doesn't work. Or at least I get this error: ! Package inputenc...

[b]1. Explain what the CPU will do in terms of functuality and configuration when executing the C source code below: unsigned char value = 0x91 1) BSR = 5; 2) BSRbits.3 = 1; 3) INTCONbitsTMR0IE = 1; 4) INTCON2bitsTMR0IP = 1; 5) TRISB = 0x00; 6) PORTB = 0x00; Please can...

Is all motion basically the result of big bang, including atomic and sub-atomic motion?

Hello Physics Enthusiasts The other day I received in the mail a uranium ore sample from United Nuclear, with a radiation measurement of 2,500cpm, intending to use it as a particle source for my replication of the famous Gold-Foil experiment, the theory for which was devised by Ernest...

Homework Statement I had an assignment where I needed to calculate reaction rate constants at different temperatures. I was supposed to use ab initio method (meaning I should use Spartan software), molecular partition functions and Eyring equation. The reaction was: H+HD...

Greetings fellow members!(New guy!) Before I would start, I've already read a lot of the threads related to "magnets" and "energy". I do undertand the PF forums rules. So please don't lock this thread and say "THIS IS NOT ALLOWED" in reality it is... But maybe its because of the unfortunate...

Folks, Is there a online source I can use for evaluating Incomplete elliptical integrals ##F(\phi,k)## and ##E(\phi,k)## I do not have Mathlab or Mathematica and Wolfram alpha requires payed registration for extended computation time. Any information will be appreciated. Regards

I am going to be building a small 'monument' that will be intended to last thousands or more years. I would like to include some electronic/electrical appartus that will have a small power consumption when demanded (no power use until a button is pushed or something). My question is this (and I...

I have a question about observing a field of radiated light (and it's source) through a microscope, specifically vis magnification and the scale of the final image observed (the field, and also the source). I have a slice of field intensity at the plane of a microscope's numerical aperture...

Homework Statement I am trying to figure out how to do independent component analysis on a single stream of time series data. The ica algorithm comes as part of the it++ package however it is necessary to perform some preprocessing on the time series data as ica works on the premise that the...

Hi, I am preparing for my circuits final and I am having trouble with this question. Can someone guide me through it? I am trying to solve this using phasors. I know I will have to use superposition since the circuit contains sources with different frequencies. So first I start of...

Here's the scenario: I need two plates that start off in proximity (a few mm apart), and I would like to vary the charge in these plates to achieve a repulsion force. Ideally it would be varied by a voltage source, so that I have fine control over the repulsion. But as it happens, it is not...

Homework Statement I need to find the current through the 3V voltage source: picture of the circuit and the equations there: vantraveller.blogspot.ca The Attempt at a Solution I was about to get 3 equations, however, I find myself having 5 unknowns, what other equations can I write...

http://img31.imageshack.us/img31/6178/ladno.jpg The floats, thanks to the principles of buoyancy, will keep ascending, maintaining the rotation of the wheel, thus achieving the world's first neverending source of energy! Or, perhaps, there is a catch? ;)

I could not figure out definition of arc voltage and arc current. Is that true arc voltage if the potential differences between dual electrode and the current is flow through one of these electrode? any help would be appreciated.

Is there an open source math software for Mac OS X which is equivalent to Mathematica? I intend to use it for vector geometry problems (drawing planes, lines in 3-D space).

If everything has energy... Which "thing" can be an energy source? Well... If we look at everything in this world,galaxy,universe, We find that every physical object is capable of doing work... If we apply the proper "INPUT" force within a distance in this humongous universe work can be...

This is an observational exercise where I have to find several different light sources and observe their spectra through a diffraction grating, then record my observations. I need two sources of each (i.e. continuous, emission, absorption). Continuous and emission are fairly easy, but for the...

Hi. I'm new here and wasn't sure which forum to post this request on, but this one seemed a good start. I am developing a talk/seminar on dealing with legacy code. In the late 1990s I was working for a large corporation in a software capacity and one day idly wondered what the source code...

Homework Statement Mesh and nodal analysis are used to find unknown currents and voltages in planar networks. Why is it necessary when performing these network analyses that all of the source frequencies be the same? The attempt at a solution I know that superposition let's us analyze...

Hello all of you very bright physicists, The local physics dept. is not answering us thus far and long story short we need a rough estimate of the power of a light source based on wavelength and a measured concentration of photons. We need a method of converting the photon concentration...

Hello, I've read that Dirac introduced the idea of the creation and annihilation operators in the solution to the quantum harmonic oscillator problem, but can anyone tell me where he did this? In a paper, or maybe in a book? I've had a little search online, but I've yet to discover...

light O / \ / \ / \ ---*--- image The above image gets brightest in the middle, but photons get equally emitted in all the directions, so what is it that keeps them form making the whole image equally bright? Is it angle of impact? Could it be the rate by which photons...

Homework Statement http://www.wifstrand.se/Albert/stuff/p7.7-1.png Homework Equations vL = L * (diL / dt). All of the inductors can be reduced to a single 8 H inductor, so iL = (6 / 8) * ∫ cos 100t dt = 0.0075 sin 100t if you integrate from 0 to t. The Attempt at a Solution The formula...

Hello everybody! There is interest in making point-like light sources, especially to measure the quality of optics, and possibly to produce optics. Here are some ways I imagine. ================================================= Semiconductor technology can make a hole of 20nm diameter...

Homework Statement The intensity produced by a long cylindrical light source at a small distance r from the source is proportional to a)\frac{1}{r^2} b)\frac{1}{r^3} c)\frac{1}{r} d)None of these Homework Equations I=\frac{dF}{dω} I is the intensity, dF is the luminous flux of the...

Hello all. I am preparing to take my math department's preliminary qualifying exam for pure math. It covers analysis and linear algebra. I have a good number of past papers but I was wondering if there is a good source, maybe a book or a website, for problems of similar difficulty. Thanks.

In the case of nuclear fission, when U-235 splits into Ba,Kr and three neutrons , then it is shown that the total mass of the products on the right side of the equation is slightly less than that of the reactants on the left side. So this missing mass-the mass defect – is converted into energy...

Hi, I've recently been reading up on circuit electricity and as the title states have found difficulty understanding the difference between pd of a source and a component from the textbooks I've been reading. So far I am to believe that the pd of a circuit is directly proportional to its...

Please I need help to understand how diffusion current can occur in a circuit that contains an N-type or P-type semiconductor without being connected to an electric souce such as a battery.And how can both drift and diffusion current occur when the circuit is connected to a battery?

Homework Statement In the circuit shown in Figure Q8 below, if Vs = 10V, use Kirchoff’s Laws to determine the currents i1, i2, i3 and the source current is. Calculate the power dissipated by the resistors in this circuit. Confirm that the power dissipated by the resistors is the same as the...

I need help finding some animals whose application of physics in the nature have inspired people to use the same physics in inventions/different applications. Some animals I've thought of are: Bats (Radar) Dolphins (Sonar) Birds (Airplanes) Bats (Radar) These animals would be...

I need help finding some animals whose application of physics in the nature have inspired people to use the same physics in inventions/different applications. Some animals I've thought of are: Bats (Radar) Dolphins (Sonar) Birds (Airplanes) These animals would be perfect, except...

I need help finding some animals whose application of physics in the nature have inspired people to use the same physics in inventions/different applications. Some animals I've thought of are: Bats (Radar) Dolphins (Sonar) Birds (Airplanes) These animals would be perfect, except...

Hi I am searching on freeman ION SOURCE for my BS thesis. I have lots of problem about the material of the FREEMAN ION SOURCE and sizes of all the part to have the best design and better beam density. I need some details. Any help would be appreciated.