What is Source: Definition and 1000 Discussions

Open source is source code that is made freely available for possible modification and redistribution. Products include permission to use the source code, design documents, or content of the product. It most commonly refers to the open-source model, in which open-source software or other products are released under an open-source license as part of the open-source-software movement. Use of the term originated with software, but has expanded beyond the software sector to cover other open content and forms of open collaboration.

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  1. M

    Why Short the 4kΩ Resistor in Source Transformation?

    Homework Statement I am a bit confused on why they can just randomly short the 4kΩ resistor, as you can see from the first pic to the second pic. THanks Homework Equations The Attempt at a Solution
  2. C

    Engineering AC Circuit with Source Transformation; find Thevenin equivalent

    Homework Statement Use source transformation to find the Thevenin equivalent circuit with respect to terminals, a, b. Homework Equations Voltage Division: (V in)*(R1/R1+R2) Thevenin / Norton / source transformation procedures RTh = RNo VTh = INo*RNo Polar...
  3. A

    Doppler Effect (Sound) - Source moving away from the Observer

    Hi! I was doing some exercises about the doppler effect on sound until I found this problem that I can't find the solution! "A source of sound of frequency f0 moves horizontally at constant speed u in the x direction at a distance h above the ground. An observer is situated on the ground at...
  4. N

    Why does the PIV in centre tap rectifier is twice of the V source?

    In the full wave centre tap rectifier, piv of diode require is twice of the input current of the transformer. I can't understand why is it twice when the source is only 1V-peak.
  5. D

    Light as a source of electricity

    Hello Dear Fellows! We all know that light is an electromagnetic wave and also we know that an antenna receives EM waves and convert it into electrical energy. My question is that is it possible for any specially design antenna to receive Light as a source of EM waves...
  6. X

    Voltage dependent Current source

    Homework Statement Find Vout at t=0.782s (I already found Vout at t=0 s. It is 0 V.) Homework Equations V=IRThe Attempt at a Solution First I found Vs = 9*sin(14*0.782)=-8.989817V (with t in radians) Since Rpi is in parallel with the Vs, its voltage Vpi also equals to -8.98917 V. Since the...
  7. O

    Engineering Series RLC circuit with source

    Homework Statement R=50Ω L=5H C=1/125F vs=200.[1+u(t)] V Find i(t) Homework Equations The Attempt at a Solution Write the KCL equation -vs+Ri+L.i'+1/C.∫idt=0 Do the derivation to get rid of the integral, replace all possibly values, we got: i''+10i'+25i=1/5.vs' (*) solve...
  8. D

    Is the laser perfect monochromatic light source?

    Is the laser perfect monochromatic light source?
  9. R

    HELP Two point source interference pattern

    Homework Statement 2 point sources 20cm apart produce 3 cm waves at a rate of 8 waves every 1.2 secondsHomework Equations how many nodal lines are present what is the angular deviation of the 3rd nodal line? what is the angle between the 3rd nodal line and the 5th nodal line? The Attempt at a...
  10. H

    Interference - two wave source

    I do not know how to approach this. I am trying to use r1 - r2 = mλ but I can't seem to find the answer! please help. I figured it out that it is constructive, but i just don't know how to mathematically prove it. r1 - r2 = mλ.
  11. M

    IR thermometer calibration source

    Hi, I currently have a black body calibration source which I use for work. It works great, I can calibrate all the IR thermometers just fine, however it isn't a simple quick "check". The IR thermometers are the ratio type in that they measure two wavelengths and using the ratio it can work out...
  12. D

    Neutron Diffusion Equation/Spherical Geometry Source Problem

    Homework Statement Solve for the flux distribution using the 1D neutron diffusion equation in a finite sphere for a uniformly distributed source emitting S0 neutrons/cc-sec. My problem right now is that I can't figure out the boundary conditions for this problem. We usually work with...
  13. I

    I am Clueless about source controls

    My company uses MS TFS for source controlling and I find this really difficult because we have to code on VMs (log on VMs and handle the code in TFS). I would like to make a suggestion to change this into SVN using command line or Tortoise GUI tools. But the client seems not to let publicly seen...
  14. A

    Thevenin equivalent phasor domain dependent voltage source

    Homework Statement determine thevenin equivalent of circuit at terminals (a,b): Homework Equations Z(L)=jwL Z(C)=-j/wC V(th)=V(oc) R(th)=V(ex)/I(ex) The Attempt at a Solution actually 1st i need help with finding V(th). i do know that V(th) would be the voltage across the 2ohm resistor, so...
  15. R

    How can I obtain the gamma spectrum of an Am-Be source in MCNPX 2.6?

    Hi I want to define an Am-Be source in MCNPX 2.6 I have Neutron spectrum But I don't have Gamma spectrum of this source. Please Help!
  16. A

    Quasar is a huge source of energy

    I know that the quasar is a huge source of energy, it can produce energy and light more that glaxies do ; so the question is how that can be possible and the quasar is a super massive Black hole which absorb every thing even Light couldn't escape ?! My Friend tell me when the Black Hole is...
  17. C

    What is the Source of Frictional Force and Why Doesn't it Possess Energy?

    Since friction is a "force" and is able to stop a moving object, why doesn't it possesses energy? For example, light, which is an electromagnetic wave, is emitted from a source which have the energy to "do light". Then what is the source of friction? An object cannot just intrinsically...
  18. J

    Find the average power delivered by the voltage source

    Homework Statement Homework Equations P = 1/2 Vm*Im*cos(θv - θi) The Attempt at a Solution First I added all the impedance values to find the total impedance seen by the source. Zt = j10 + (50 || 20 + j10) = 15 +j5 Ω Now since the circuit is not purely resistive, I can't...
  19. R

    Find Photons per second on the eye from a source a distance away

    Homework Statement A typical incandescent light bulb emits ~3x10^18 visible-light photons per second. Your eye, when it is fully dark adapted, can barely see the light from an incandescent light bulb 10 km away. How many photons per second are incident at the image point on your retina...
  20. ch3cooh

    Is a resistor a dependent source?

    Is a resistor a voltage-controlled current source? WHY? I think it is but I don't know whether I'm correct.
  21. W

    Stochastic approximation applied to fixed source problem

    Dear forum members, I am trying to solve the following system of equations. ψ(x,y,z)=∫∫ψ(x',y',z)K(x',y',z)dx'dy' z=f(ψ) What I do is to solve the integral equation with a Monte Carlo method, evaluate "z" and do a loop until convergence. My question to you is whether it is...
  22. X

    Is this source credible or biased?

    Hi everyone, As I was doing some research on nuclear energy moratorium, I came across the Bulletin of the Atomic Scientists Journal . After reading some of their articles, I realized that they have a very negative view on nuclear energy. I do not completely trust the source but I would like...
  23. J

    When to transform the current source to voltage source?

    Homework Statement Homework Equations The Attempt at a Solution First, I found all the impedance values. (starting from the left) Z1 = 1 / (j * 16E5 * 15E-9) = -j41.67 Z2 = 80 Z3 = 30 Z4 = j * 16E5 * 60E-6 = j96 I then combined Z1 and Z2. Z1 || Z2 = (-j41.67 * 80) /...
  24. I

    Do Tax Havens Play a Crucial Role in Global Economics?

    Guess the source of this headline. No search engines allowed! Are secret overseas tax havens essential to the world economy or a benefit to the rich that should be more tightly regulated?
  25. E

    Real vs Unreal Source Refraction Through Lense

    I was having trouble while thinking about the unreal source for refreaction through a lense... In lense light is refracted twice...the real image for the first refraction works as an unreal source for the second refraction... I understand how it is... But fail to feel it... I mean how would I...
  26. E

    Energy of twin source interference

    Homework Statement http://www.mediafire.com/view/?3efd7326e49kteb I've worked out all except part (iv). These are my workings : http://www.mediafire.com/view/?elswc5g5412zhzq I just can't see how to get rid of cos(pi*(x1+x2/λ -wt). Also, where does the I0 come from ?
  27. E

    Twin Source Interference - Radio Towers

    Homework Statement http://www.mediafire.com/view/?09c89b8986u5zls The above is a question from my problem sheet. I've got no idea how to attack this since its been very poorly explained in my lecture handouts. Can someone please help me ?
  28. S

    Engineering Find power of resistor and source in AC circuit

    Homework Statement If an average power of 500W is dissipated in the 20Ω resistor, find Vrms, I S RMS, the power factor seen by the source, and the magnitude of VS (Based on circuit in attached diagram) Homework Equations Pave= Irms*Vrms*pf*\frac{1}{2} Imaginary number referred to as...
  29. iVenky

    The Entropy of Information Source

    In the paper "A Mathematical theory of Communication" by Shannon I couldn't understand a theorem (Theorem 4) under the topic "The Entropy of Information Source"- Here 'H' is the entropy. Can you explain me how we get this theorem? What is this n(q)? I couldn't understand the sentence...
  30. Z

    MTW, Chap19, Stationary relativistic Vs Weakly gravitating source

    hello, in MTW Ex 19.1, it was considered a Weakly gravitating body whereas in Ex 19.3, a Stationary relativistic source. What relativistic means here ? does it mean the source is very dense and massive ? or does it mean it is rotating at near the speed of light ? Can I specify the mass as the...
  31. G

    Finding direction of a source using directional antenna?

    Hi all, Is it possible to find the direction of a source in 4 quadrants using directional antenna? I am thinking of setting up 4 directional antennas, facing to 4 quadrants, and they will receive the waves from the according quadrants. What do you guys think about this? And is there any...
  32. N

    What's the source of EM radiation

    An electron and a positron annihilate and energy is released in the form of quantized EM (gamma etc.) rays: Now some childish yet inquisitive questions; 1. Where were there quanta prior to annihilation, inside the electron or positron (or both)? 2. Were these quanta really present...
  33. R

    Connecting 30 motors to one source help

    Hi guys. I am having some issue and would love any help. I have a project that requires 30 motors to be hooked up to a single power source. The problem is, the surge voltage that happens the moment the motor turns on causes the buildings circuit breaker to trip. The only way to bypass this...
  34. A

    Programming atmega32 clock source

    iam using atmega 32 and i want to use external 16MHZ crystal I have figured out the fuse setting for this as lowbuyte=0xFF and highbyte=0Xc9 what i cannot understand is should i set fuse bits before programming or after programming? because as i have specified external crystal as clock source...
  35. W

    Identification of radiation source from gamma spectrum peaks.

    I have an unidentified radiation source. I used a NaI(Tl) detector and multichannel analyzer to collect data and plotted the spectrum. I found peaks at energies of 86.3, 123.7, and 369.6 keV. From this data I am attempting to identify the source, but I am having a difficult time. I tried using...
  36. 4

    Is MinutePhysics (youtube) a reliable source?

    Is MinutePhysics (youtube) a reliable source? I've been watching his videos since they started, but some of the stuff he mentions I question, or is Physics so amazing that I can't believe it xD?
  37. D

    Constant source Poisson eq in 2D, Dirichlet BC, average value?

    Hello, for the Poisson problem Δu = -1 on a 2D circular disk with u = 0 on the boundary, we have average(u) = \frac{1}{8\pi}Area(disk), which is easy to see, as the solution is quadratic in the polar coordinate r. Does this (or a similar) relation hold for non-circular 2D domains? This...
  38. D

    Superposition with a dependent current source

    Homework Statement I uploaded the assignment it is problem 2 Homework Equations The Attempt at a Solution I really just want confirmation that my work is ok, and the command for a dependent current source in PSpice. The things that I found that are dependent, are very confusing...
  39. K

    Finding Thevenin Equivalents using Source Transformations

    FIRST OFF: Sorry for the multiple post on this subject, I couldn't figure out how to edit my first post on this topic (I promise I'm not spamming!) Homework Statement Homework Equations The Attempt at a Solution Step 1: Removed unnecessary resistors R1 and R3. R1 is removed...
  40. C

    Does a Convex Lens Cause Eye Heat When Viewing a Light Source?

    I was just wondering if a person wearing convex lenses looks at a light source... Will excess heat be generated in his eyes? As it is a converging lens.. Thanks!
  41. Ivan Seeking

    What is the Secret New Energy Source Using Magnets?

    I'm Rich! "New Energy Source"! Tonight I found a very professional looking, 200+ page report lying on my back doorstep. It was a in a folder titled, "New Energy Source", and included the name, phone number, and email address of the person responsible. I have no idea who this person is, why they...
  42. P

    Experiment: Moving Photon Source - Questions & Answers

    I have an idea for an experiment to see how the distribution of photons changes when they are emitted from a moving photon source. This is a continuation of an earlier discussion here with added information and more questions. "What happens to a photon wave packet when half out of a moving...
  43. A

    Lightweight power source for two 2' diameter propellors

    Hey everyone! I am designing an experimental, manned aircraft that uses twin caged propellors for VTOL, and I'm looking for a lightweight, high-output power source to power them. Any ideas?
  44. T

    Source of Virtual Particles in Space?

    I'm trying to understand the nature of the virtual particles that exists in empty space. I understand that they 'bubble' in and out of existence, but why do they exist in the vacuum of space? If all particles spend some of their time as virtual particles, does quantum mechanics suggest that some...
  45. C

    Dependent source with 2 other sources (using superposition), mesh

    Homework Statement http://imageshack.us/a/img834/5512/homeworkprobsg216.jpg Using superposition, find i.Homework Equations V = IR, KVL, KCL, Nodal / Mesh analysis, voltage division, current divisionSuperposition procedureThe Attempt at a Solution So this time the dependent source is a...
  46. mishima

    Mesh analysis, 2 meshes 1 known current source

    Homework Statement Find i1 in the following figure, given: Vs=10V, I=1A, R1=5, R2=2, R3=4 Homework Equations KVL The Attempt at a Solution Applying KVL to mesh 1: Vs-i1R1-(i1-i2)R3=0 and i2=I=1A So, i1=(Vs+i2R3)/(R1+R3)=(10+1*4)/(5+4)=14/9=1.56 A But book gives answer as...
  47. C

    Engineering Dependent voltage source, find max. power to load in circuit & R(Th)

    Homework Statement http://imageshack.us/a/img831/2617/homeworkprobsg213.jpg Find the load RL that will result in maximum power delivered to the load of the circuit. Also determine Pmax deliveredHomework Equations V = IR, KVL, KCL, voltage division, current division Thevenin procedures,Pmax...
  48. M

    How to measure the wavelength of a light source

    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...
  49. C

    Nodal Analysis of a Voltage Dependant voltage source, no pretty answer

    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...
  50. C

    Find the Thevenin resistance for network with dependent current source

    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...
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