Source Definition and 1000 Threads

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. V

    Circular Motion: What's the Source of Centripetal force in this?

    [Moderator's Note: Thread moved from forum General Physics hence no formatting template] I am trying to study Circular Motion for my exams and I'm kind of unsure about one question. The question asks what's keeping the truck in circular motion. It has to be gravity I know, but gravity being...
  2. J

    I think I may have found a renewable energy source

    Hello guys so I have this idea of mine which I can't get my head around and I need someone to tell me why it won't work, so let's say you have a fully pressurised tank of air and you blow that pressurised air at a turbine connected to a generator, ovisously the generator will then start to...
  3. Marcin H

    Engineering Thevenin & Norton Circuit with Current source?

    Homework Statement Homework Equations V=IR Thevenin/Norton The Attempt at a Solution I am trying to find the Voc, but this circuit isn't making sense to me. So to start we can ignore the 9ohm resistor and that branch for now when Finding Voc so you are basically left with the square...
  4. B

    A point source isotropically emitting 10^8 fast nuetrons

    Homework Statement A point source isotropically emitting 10^8 fast nuetrons per second falls out of its shield onto a railroad platform 3 m horizontally from the track. A train goes by at 60 mph. Ignoring scattering and attenuation, what is the fluence of nuetrons that would strike a passenger...
  5. Hercuflea

    Fluence rate of gamma source - getting two different answers

    Homework Statement A 1 meter long uniform line source of high energy photons emits 10^7 photons /sec. Calculate the particle fluence rate (flux density) at a point P 1m away from the midpoint of the source. Homework Equations ## dN = number~of~particles ## ## da = differential~area## ##\Phi =...
  6. S

    Point source of light, opaque screen with hole. photodiode problem

    Homework Statement A point source of light (wavelength \lambda = 600 \, \text{nm} ) is located a distance x = 10\,\text{m} away from an opaque screen with a small circular hole of radius b. A very small photodiode is moved on an axis from very far away toward the screen. The first...
  7. B

    Solid Mechanics Q: Textbook source for image?

    Hi everyone, Does someone know from which textbook the question below was taken from? The only given data the i found is q1=π*sin(πx/2). Thanks:)
  8. C

    Question on Laplace Transform of a constant voltage source

    Hello. I am reviewing the use of the Laplace Transform to do circuit analysis and I am slightly confused about the transform of a constant voltage source. For example, let's say we have a constant voltage source V1(t) applied to a circuit for a long time - let's say it reaches steady state. We...
  9. T

    Common source amplifier low frequency resonse

    Here's the amplifier in question: I'm not understanding this part: Why is Cs not included in the current divider ? To my understanding of current divider, It = Id+Io, where It is the current flowing through Rd So, Io = It*(1/Cs)/(1/Cc2)+RL
  10. B

    Casimir Effect as a power source

    Would it be possible to create energy or a power source using plates that are connected in a way that when two plates are close enough the casimir effect would pull them together while also pulling two other plates apart which in turn would create a casimir effect and pulling those plates...
  11. M

    HVDC - Current Source Converter - Minimum DC Power flow

    Hello, I was reading about the differences between Current Source Converters and Voltage source converters. One main difference was that Current source converters need to have a minimum DC power flow of 5-10% while VSC do not have a min flow requirement. It was also called a deadband. Why is...
  12. H

    Exploring the Source of Heat in a Vehicle CD Player: Uncovering the Mystery

    While changing a CD in my vehicle CD player I noticed the CD is quiet a few degrees above ambient after it has been playing for awhile, not measured just felt very warm to touch. the question is what is the source of the heat? I considered the LED but that makes no sense. Is it the motor...
  13. QuarkDecay

    B Doppler effect/ both moving same direction

    What happens if a source and the observer move at the same direction? Always hear how only one of them doesnot move, or when they move towards each other. For example. An ambulance moves towards direction A with Va. A biker moves towards direction A as well, with Vb. What happens to the...
  14. J

    Power delivered to each source. Image included

    Homework Statement I got the correct answers for A and B, I just need help with C and D. A. Find indicated currents. I1= I2 = 3 A ... IL = 6 A B. Find total power delivered by each source. PE = 12 V (3A) C. Find the total power delivered by each source and compare it to the power delivered...
  15. okigbo anthony

    I Is There a Reliable Source Code for Quantum Key Distribution?

    Am currently working on a project relating to quantum cryptography. will be pleased if someone will help with source code for quantum key distribution algorithm
  16. J

    Soving for resistor values and source current-image included

    Question is in image included So, I need to find R2, R3, and Is. I was able to get the correct answer for R3 by doing R3= V/I (R3= 12/1 = 12) . however when I apply that equation to R2 ; R2= V/I. (R2=12/4 =3), I do not get the correct answer. The answer is supposed to equal 4 ohms. Am I using...
  17. A

    Multiple Source Transformations

    Homework Statement In the attached image, I'm confused on how the first circuit reduces to the second circuit. Homework Equations Is=Vs/R1 The Attempt at a Solution I know that in order to do a source transformation that I need to have a current source in parallel with a resistor or a...
  18. ali khotbesara

    NaI detector in water source -- gamma & beta

    Homework Statement simulation of bersiv function of NaI detector it's in cylinder of water with volumetric source of Potassium40 (90% beta 1.31 mev & 10% gamma 1.504 mev ) how candefin define electron and gamma Volumetric source in mcnpx (6) ...
  19. Sveral

    Connecting an External Audio Source to a DDS-100 Function Generator

    Hello, I wanted to know, if it`s possible and how it to go about connecting an external audio source, for example, an mp3 player to the circuit of a DDS-100 Function generator, so that it outputs the audio from the mp3 in the selected wave form...
  20. A

    Excess Energy Saving from a constant energy source.

    Hello everyone. So i live in Lebanon, and since a long time now we have constant power cuts, almost half the day each day. For that the Lebanese made up a system in which each neighborhood has power generators providing electricity to the residents when the power is out. Usually the owners of...
  21. T

    When can I use source transformation?

    Homework Statement I'm asking this question because I was trying to apply the method to a Thevenin Eq problem and the answer came out wrong. Also one more related question. According to the textbook, when a current source is connected both in series with a resistor and in parallel with...
  22. YellowBelliedMarmot

    Engineering Finding the Current Source of an RLC AC Circuit

    Homework Statement Homework Equations V=IZ[/B] Zc = 1/(-jwc) Zl = jwc w = 2(pi)*f The Attempt at a Solution I'm teaching myself circuit analysis, and it's been rough. Ultimately, I been able to mostly figure everything out, but I've ran into a wall with AC. The main problem I am having...
  23. D

    Drawing dark energy from space as a power source

    Hi. I was wondering if someone could tell me whether there is any reason to believe that one might eventually (distant future) draw power from dark energy or dark matter as a power source for spaceships. Thanks.
  24. K

    Current limiter for TIA, realizing dc current source

    Problem: my photo diode receives pulses of width 10ns-150ns and repeating at rate of 1Hz-50KHz the current from photo diode depending on incident light can go from 10nA-100mA, so i have two photo diodes to cover the dynamic range, what i want to do is limit the current from a photo diode to...
  25. R

    Calculating Smallest Path Length Difference for Overlapping Waves at Nodal Point

    Homework Statement Two point sources, S1 and S2, are vibrating in phase and produce waves with a wavelength of 2.5 m. The two waves overlap at a nodal point. Calculate the smallest corresponding difference in path length for this point. Homework EquationsThe Attempt at a Solution I really...
  26. K

    How do i go about reading source code?

    I've been learning the absolute basics of a few programming languages and feel like I want to start taking a more "practical" approach to learning, so I've been looking into source code. My question is pretty simple, where do I start? How do I identify the structure of the files that go into...
  27. LLT71

    Speed of light; source; frame of reference

    why can't speed of light be relative to it's source?
  28. terryds

    Circuit problem with two voltage source

    Homework Statement R1 = 2 ohms R2 = 4 ohms R3 = 6 ohms E1 = 10 V E2 = 14 V What is the voltage between point A and B ? A. 0.18 V B. 0.98 V C. 1.34 V D. 1.64 V E. 3.28 V Homework Equations KVL The Attempt at a Solution [/B] I tried using KVL I assume that both mesh currents will go in...
  29. N

    What is the reactor power at Source, Intermediate and Power

    hello all, I am trying to determine what the percentage of reactor power will be at each power level range measured by each detector (i.e Source, Intermediate and Power range). All I can seem to find is info in the CPS rate not percent reactor power.
  30. Gbox

    Engineering Diode circuit with AC excitation source

    Homework Statement Graph ##V_{out}## Homework EquationsThe Attempt at a Solution When ##V_{in}=V## C1 is positive on the left and negative on the right, and C2 is negative on the the down side and positive on the upper side so there is no Vout?
  31. goonking

    Engineering RC Circuit with Current Source: Is This Solution Correct?

    Homework Statement Homework EquationsThe Attempt at a Solution so when t=0, the capacitor is a closed circuit. The Req of the circuit is (20k)(30k)/(20k+30k)= 12000 ohms. U = I Req = (7.5x10-3A) (12000 ohms) = 90 Volts so there is a voltage drop of 90 volts across the 20k resistor (R1)...
  32. G

    Inverse Square Law, Temperature Change, and Heat Source Temp

    I've been trying to wrap my head around the relationship between temperature increase of an object at a distance and temperature of a heat source. From what I've found, the temperature increase of an object from thermal radiation is affected by the inverse square law...
  33. Dade Murphy

    Attenuation and source positioning

    Hello, I've been reading about attenuation, and I wonder if there's a way to determine the distance to your source. Forgive my poor writing; I'm new to the topic. I understand that equation for linear attenuation is I = I0e-μx where: I = intensity I0 = initial intensity μ = attenuation...
  34. Alfreds9

    Is it possible to estimate a light source wattage remotely?

    I'd like to know if it's possible to roughly estimate a light source wattage remotely, knowing the distance and perhaps estimating that at such a distance it's still above the minimum human recognizable threshold at night (in a light polluted area). Maybe using a DSLR camera could help by...
  35. H

    Is Helium 3 Mining on the Moon Still a Viable Power Source?

    There was once hype about mining this on the moon. Still a thing being considered?
  36. science_rules

    A Source for First Physics and Chemistry Research Papers?

    I want to know if there is a good online source to find and read first-time research papers written by undergraduates(bachelor's research papers) to get a feel for how to write a first research paper in Physics or Chemistry. Can you give me some good places online?
  37. kiwaho

    I Why to use negative hydrogen in spallation neutron source?

    Just wondering why to use negative hydrogen H- ion in spallation neutron source. I read the literature through http://neutrons2.ornl.gov/facilities/SNS/works.shtml , still not yet get the answer. If directly use proton, then still easy to accelerate, and no need to strip off the unwanted...
  38. F

    Synthetic Renewable Source of ATP

    I need a synthetic and renewable source of ATP. I heard you can create it with electricity or from the lab invitrogen as a post described here. But I couldn't find anything on it, so let me know, thanks! P.S. And if you combine it with the enzyme RuBisCO and carbon dioxide you can get renewable...
  39. N

    Source of light in Michelson-Morley experiment

    Hi I wonder if anyone can tell me what was the source of light Michelson and Morley used when they did the experiment(s) to measure the (difference of) speed of light in different directions? And can it be done with sunlight? Young observed interference patterns with sunlight in 1801 in...
  40. Pattonias

    Go-to source for steel ttt diagrams?

    I am working on a heat treatment plan, and I am curious if there is a go-to source for ttt diagrams for particular materials. I am working with SA-516 70, but it would be nice if there was one place where I could go to get current/reliable information. So far google searches have been unsuccessful.
  41. S

    A Can a Scalar Field Exist Without a Net Source?

    The magnetic field has no net source or sinks i.e. number of sources are equal to the number of sinks. Can a scalar field also have no net source? Or a source is required for a scalar field?
  42. M

    Finding Thevenin Equivalent with Dependent Source

    Homework Statement I am trying to find the Thevenin Equivalent of this circuit Homework Equations Using KCL and node voltage The Attempt at a Solution I found the open circuit voltage for the thevenin voltage so far by the mesh current method, and now I am trying to find the closed circuit...
  43. A

    I What is the source of curvature in an accelerating frame?

    I can understand that a free falling frame in a curved space with a non-zero Riemann tensor has a zero Ricci tensor but I have a doubt about the opposite; does an accelerating frame in a vacuum space have a non-zero Ricci or Riemann tensor? if so, where do components of energy momentum tensor...
  44. Thom_Silva

    Sound source moving at the speed of sound

    Hi, Suppose that a plane that is traveling at the speed of sound has a loudspeaker attached to it. Along the he trip the loudspeaker releases specific sounds. What does the pilot ear when the first sound is released? And after the second sound is released, does he ear both sounds at the same...
  45. fluidistic

    How can scientists trust closed source programs?

    I wonder how can scientists trust closed source programs/softwares. How can they be sure there aren't bugs that return a wrong output every now and then? Assuming they use some kind of extensive tests that figures out whether the program behaves as it should, how can they be sure that the...
  46. mmusiak

    B What is the amplitude of a gravitational wave at the source?

    In the most recent postings on LIGO, it is stated that the amplitude of the signal is less than the diameter of a proton after the propagation of the wave over billions of light years. I am assuming that the wave amplitude will decay as 1/r^2, but perhaps that is an incorrect assumption. So is...
  47. kini.Amith

    Classical A source for solved problems in Kinetic theory of gases

    I am doing a course on statistical mechanics and we are using the textbook by Mehran Kardar. We are currently dealing with a chapter on kinetic theory. The problem is, I find the exercise problems to be quite tough (and many of my classmates agree with me), and there are no good solved examples...
  48. P

    Complex Impedance of a voltage source and 2 resistors

    Homework Statement A real voltage source can be expressed as an ideal voltage source that is in series with a resistor that represents the inner resistance of the voltage source. This voltage source is a EMF and it is also in series with another resistor. Suppose both the EMF resistor...
  49. S

    I Independence of speed of light and velocity of source

    I've been attempting to learn special relativity, but I've encountered a stumbling block. I understand that the speed of light is independent of the speed of the source of the light (similar to how sound waves travel at a speed that is independent of the speed of the energy source of those...
  50. M

    1d diffusion equation solution for slab with non symmetric source

    Disclaimer: This is a homework problem I need to analytically solve the diffusion equation for a 1d 1 group slab with width a, and source distribution Se^(-k(x+a/2)) I've gone through the math, and come up with my homogeneous and particular solution and attempted to apply the boundary...
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