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. D

    Antenna as a source of electricity

    Hi everyone! I need your help to design an antenna which produces current. Since i m not an engineer & have no technical knowledge. So, here is the principle! Guid me how to design an antenna for radio waves or any other one which will produce a maximum attainable current from these by...
  2. G

    What is the impact of speaker direction on noise levels?

    If I am using a brush cutter creating 98db at ear (manufacturers claim) and I can still hear music from 30m away what would the db be at the source of the music. I was wearing ear defenders but presume that they would work equally on both sources of noise. I am lead to believe that the...
  3. D

    How Do You Calculate Power with Thevenin's Theorem and an Inserted Source?

    SOLVED... I DON'T KNOW HOW TO DELETE THE POST. Homework Statement Find the power delivered by a source (Is or Vs) connected between terminals a and b, after you've found the V and R Thevenin across those terminals. Homework Equations P=IV Is=given Vth=found Zth=found The problem hints that I...
  4. E

    Collecting energy from a hot diffuse source

    Alright, let's see what ideas everyone comes up with on this question. I'm no optics guru, so I'm hoping you have better ideas than me. Here's the situation: I have a column of hot gas wherein every gas molecule emits radiation over 4π sr. At one end of the column I have a window where emitted...
  5. F

    Using a hototransistor to follow a light source

    I'm working in a project of an mechanical arm that will follow a light source, like a light bulb. So i'll need a phototransitor to make it work. Which one is the best for this kind of project?
  6. T

    What are the sources of neutrons in starting up a nuclear reactor?

    Thank for all if you understand my ideal. My problem is i don't know what's neutron which cause of fission in critical accident? seem it must be have the first neutrons, and then reaction fission occurred ? eg The critical model in some nuclear accident, what is neutron source? The...
  7. Z

    Source of Hydrogen: Where Does Our Sun Get Its Fuel?

    Our Sun is at least a second generation star. This is known from the heavy metal content of the star. But if a previous star (or stars) existed in the vicinity of our Sun and used up all their hydrogen fuel, where does the hydrogen come from that makes up most of our Sun?
  8. A

    Two source interference determining wavelength

    Homework Statement A laser with wavelength d/8 is shining light on a double slit with slit separation 0.300 . This results in an interference pattern on a screen a distance L away from the slits. We wish to shine a second laser, with a different wavelength, through the same slits. What is the...
  9. M

    Is particle speed affected by source?

    I have some basic understanding that: Sound travels through air medium, and sound is in [pure wave form] (Please, correct [...] if wrong). Sound speed is not affected by its source. Some heavy object fired by its source. The object doesn't need medium to travel. The object is in [pure particle...
  10. K

    Engineering Thevenin equivalent circuit with dependent current source

    Homework Statement Find the thevenin equivalent circuit of the circuit to the left of the terminals AB. Circuit diagram is attacted below. Homework Equations The Attempt at a Solution I know that the thevenin resistance is 1kohm. I also know that the thevenin voltage is the voltage across...
  11. H

    How Much More Intense Is One Sound Source Compared to Another?

    Two sound sources have intensities of 1×10^-11 W/m^2 and 1×10^-7 W/m^2, respectively. Which source is more intense? 10 Log (10^-7)/(10^-12) = 50 10 Log (10^-11)/(10^-12) = 10 So 1×10^-77 W/m^2 is more intense. However the next question is by how many times more? Will someone please...
  12. M

    Radioactive Activity of a Gamma source

    Homework Statement The issue I have is that I am asked to estimate the activity of a small source of gamma radiation; the question is written below: 'A small source of gamma radiation is placed at a distance of 160mm from a detector of area 18mm^2. The count recorded on the detector after 30...
  13. C

    How complex would it be to make a usb power source imitating small battery?

    there are some computer related gadgets out there which, courtesy of the OEM decisions, have to be used with a small battery. E.g. some of the graphics tablet related pens are that way. Perhaps in some situations (like "battery prices just went up by 1000%" situation) it might be nice to be able...
  14. M

    Rlc circuit with ac current source

    Homework Statement An AC current source, 1 ∠0° A, with angular frequency 1 rad/s is to be applied to the input terminals of the circuit. Circuit is RLC, the current source is in parallel with a 1F capacitor which is in parallel with a 1H inductor which is in series with a 1Ω resistor. I...
  15. T

    Phase Shifts in Point Source Waves: Exploring the Why & How

    My text says that as we approach a point source (of e.g. sound) from a distance, the phase angle between pressure and particle velocity will gradually shift from zero (in the far field/plane waves) to 90˚ (in the near field/spherical waves). I can't find any intuitive explanation of why this...
  16. M

    Resistor & Ideal source network

    Homework Statement http://img138.imageshack.us/img138/6717/hwprob.jpg Homework Equations General intuition, KCL, KVL The Attempt at a Solution I've worked this out multiple ways to no avail. I think the easiest way to go about this is to set the left node to ground (0 potential) and go...
  17. M

    Doppler effect of light source

    A source and a receiver is at rest with each other. Source emits some couple of light pulses, and stops emitting more. 1. The pulses is not reached to the receiver yet, and source starts moving. Does the receiver experience doppler effect with the emitted pulses? 2. The pulses is not...
  18. S

    Help needed in calculating Flux of point source (NucEng)

    Homework Statement A 2 \mug sample of {}^{47}Ca is encased in a lead sphere. What is the photon intensity 5 cm from the source? Use some of the tables in your book to find the required information. Homework Equations Flux/Intensity of photons from a point source...
  19. O

    Are there any good source to learn how to work a problem from a proof?

    After having several years of calculus or Diff Eq teachers telling me not to worry about what we're doing, just use the example to solve the problem, I'm having to take numerical analysis. The problem is the professor tends to give a proof and one example. The book sucks and according to the...
  20. E

    Engineering Analyzing a circuit with a current dependent voltage source

    Hey guys, I'm trying the analyze a circuit, I have the answers I should be getting but they're way off what I'm getting when I'm trying to work it out. I think I might be approaching it from the wrong angle, does anyone have any suggestions as to where I might start. I'm trying to find v3...
  21. A

    Solar Spectrum: The source of sunlight

    What is the source of sunlight? The answer is Solar spectrum. Can anyone explain how the crimson color is created? actually what happen when the sunlight is created? Need help from the expert.
  22. K

    Unknown Light Source Through Polarizer

    I recently had a homework problem that asked the following. Can someone please explain to me how in the world this can be true?! It makes no sense to me that you can get an intensity that is equal to when light is passed through a vertical transmission axis and a horizontal transmission axis...
  23. A

    How do i find the equivalent voltage source?

    Homework Statement How do i find the equivalent voltage source of... 1) Two AC voltage sources in series with same frequency and phase = ? 2) One AC voltage source in series with a DC voltage source = ? Homework Equations Equation of a AC voltage source as a function of time V(t)=V_m *...
  24. W

    Voltage and current source in superposition theorem

    why we take current source as a open and voltage source as a short in superposition theorem. is this is because of its internal resistance or any other reason exist?
  25. S

    Using source transformation for dependent sources

    Hi all , is it possible to use the source transformation for dependent source ..? i guess yes because i came across a problem which asks to use source transformation to find Vx as shown : http://img571.imageshack.us/img571/2389/50111057.jpg and my solution was ...
  26. F

    Transistor as Current Source. Forward Active?

    Homework Statement Why does a transistor with a constant V_{B} (e.g. V_{B}=1V) only need V_{C} \approx 0.3V to act as a current source; If V_{C} < V_{B} doesn't that mean the transistor is not in forward active mode and thus not a mode we want to work in. Homework Equations The...
  27. Q

    Is stress a source of gravity?

    In GR normal stresses as per the three lower diagonal terms T11, T22, T33 in the SET (stress-energy tensor) (e.g. http://en.wikipedia.org/wiki/Stress%E2%80%93energy_tensor) are source terms for gravitating mass. And afaik true for any similar theories of gravity. Owing to their being resolved...
  28. N

    Edge detection using LED light source.

    Here's my current project goal ( And what I need help with): I want to use an LED light source, shine it through a 1" x 2" slit and then use a linear array camera to detect the edges of the slit. The problem: Since LEDs are a point source of light emission, my camera has a difficult time...
  29. T

    Uncovering the Mystery of Anti-Matter in Our Galaxy

    I had not heard of this, so I thought others might be interested. I thought that all natural Anti matter had been lost at the beginning of the Universe, but apparently there is a 10000 light year cloud of anti matter near the center of our galaxy...
  30. A

    Uncovering the Mystery of the Wow Signal: Can We Locate Its Source?

    Catching up on the Universe Today I came across this article discussing the history of the wow signal. Since it fit the profile of a non-naturally generated signal, the would indicate either an equipment glitch or there really was something out there sending a signal. My question is, based on...
  31. R

    Creating AC current from 6v DC source

    Hello! I'm a long time reader, but this is the first time I've not been able to find the information I've needed already... I have a small electromagnet that needs to have an AC current (it is essential that the electromagnet has a reversing polarity) but the source of power comes from a 6v...
  32. D

    Need a source for practice problems

    I do not have any physics books. But I would like a source, if you know of any online, where I can get practice problems dealing with the basics. Such as, 1-D and 2-D motion dealing with equations such as (X=VoT+.5AT^2) (Also dealing with different Vectors and decomposition of Vectors dealing...
  33. E

    Why use inverter and not correct ac source to ac drive directly?

    Hi all, I have a question with regards to why should we use an ac-dc, dc -dc, dc-ac converter to an ac drive? Why not connect an ac source through a transformer directly to the ac drive? Isn't it the same? What equations can prove that the use of converter is a better choice?
  34. C

    Sloving a depentant voltage source problem using node voltage

    Hi everyone, I currently stumped in the process of approaching a dependent voltage source problem using node voltages. Attached is the circuit. What I know: the Node north of the 60V supply with also be 60V there are four nodes, two when supernodes are used What I'm confused...
  35. _maxim_

    High precision, good accuracy Current Source Schematic

    I am looking for a schematic diagram of a compact, temperature compensated, stabilized, high precision (accuracy within 0.5% or less) current source. The target current should be easily set to 100/150 mA, no matter if discrete or integrated solutions must be used. This project will be...
  36. D

    Could The Universe be a Wave emanating from a greater source?

    Is it physically possible that the entire universe and everything in it, in a form of a Wave, emitted from a source? That the Big Bang wasn't the point of all creation, but only our universe getting pulsated from a source. And what we see as expansion really could be the Wave (or pulse?) being...
  37. R

    What Is Vo in a Power Source Diagram Circuit?

    Circuit help Homework Statement I have a book problem that show this pic (see attachment) The problem wants me to calculate Vo and the end point of the graph and midpoint but I am not sure what Vo is. Homework Equations Vo=Va-Vb The Attempt at a Solution I think Vo is the total...
  38. E

    Thermodynamics: Concentric Spherical Shells with Point Source Radiation

    Homework Statement There is a perfectly absorbing spherical shell with radius R1 suspended in space. Inside is a smaller spherical shell with radius R2. Inside that shell is a ball of radius R3. All three objects are concentric. In the center of the ball is a point source radiation with power...
  39. F

    Source Panel method for flow pressure distribution over cylinder

    Homework Statement Develop a source-panel computer program to numerically calculate the potential flow pressure distribution on a right circular cylinder with and without circulation. 1.) Tabulate and plot your numerical results for the pressure coefficient distribution on the cylinder...
  40. C

    How Does Intensity Change with Distance from a Vibrating Source?

    Homework Statement A tiny vibrating source sends waves uniformly in all directions. An area of 3.25 cm2 on a sphere of radius 2.50 m centered on the source receives energy at a rate of 4.20 J/s. (a) What is the intensity of the waves at 2.50 m from the source? (b) What is the intensity of...
  41. S

    Engineering To find power factor of the ac circuit given only the source and load voltages

    how to find power factor of the load, the three voltmeter readings are V1=220v,V2=122v,V3=136v
  42. K

    Free/GNU/Open Source programming language for Windows GUI

    Hello everyone, Can anyone suggest me a suitable GUI programming language for windows (like Microsoft VB or anything else). The software should be free of cost. It also should not restrict me to publish my product as freeware/open source. (Additionally the software should be able to handle...
  43. K

    Finding Highest Order Node & Antinode: Source Separation d & λ

    Homework Statement if i have source separation between 2 light sources, d, and wavelength, λ, what is the highest order node and antinode? Homework Equations The Attempt at a Solution im not sure where to start for this question I am leaning towards division to cancel out the meters
  44. H

    Proving Source, Sink, and Node of a 1st Order DE w/Taylor Series

    Challenge! Use Taylor series expansions to prove first-order Differential Equation Suppose dy/dt = f(y) has an equilibrium point at y = y0 and a) f'(y0) = 0, f''(y0) = 0, and f'''(y0) > 0: Is yo a source, a sink, or a node? b) f'(y0) = 0, f''(y0) = 0, and f'''(y0) < 0: Is yo a source, a sink...
  45. Jameson

    LaTeX Uncovering the Source: How to View Latex Code in Mathjax Images

    It's strange no one has noticed but after reading through the Mathjax documentation guide, all you have to do to view the source code is right click over any Mathjax image and click "Show Source". A new window will pop up with the Latex code. Jameson EDIT: Try it here $ \displaystyle...
  46. R

    A device connected to a current source and then resistor

    Forgive the title, I was unsure of how to briefly describe the problem. Attached are diagrams. Homework Statement The device shown in Figure P2.5 can be modeled as a current source in parallel with a resistance. When this device is connected to a 5[mA] current source, so that...
  47. H

    Is Khan Academy a good source for self-learning?

    When professors are insufficient or don't teach very well, is Khan Academy a good alternative to learning topics such as calculus/differential equations, etc. as well as the sciences (bio, chem, physics)? I can't tell if the content is good resource material because I'm not an expert on any of...
  48. K

    Mean Value property (harmonic functions) with a source?

    Mean Value property (harmonic functions) with a source?? Homework Statement I understand that the heat equation may yield ∂u/∂t=0 on the LHS and on the RHS we may still have Uxx+Q where Uxx is partial with respect to x twice and Q is a heat source. U in our case may be the temperature...
  49. J

    Find the distance between objects and sound source

    Homework Statement One microphone is located at the origin, and a second microphone is located on the +y-axis. The microphones are separated by a distance of D= 1.21m. A source of sound is located on the +x-axis, its distance from microphones 1 and 2 being L1 and L2, respectively. The speed of...
  50. T

    Continuous Surface Charge Source - Integral Confusion

    1. Homework Statement Find the total charge on a circular disc of radius ρ = a if the charge density is given by ρs = ρs0 (e^−ρ) sin2 φ C/m2 where ρs0 is a constant. Are the two limits of integration from 0 -> a for ρ and 0->2∏ for φ? In the example given in the notes, ρ varies, instead of...
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