Source Definition and 1000 Threads

in this article on Ars Technica, Microsoft has released the source code to the Calc.exe app calc.exe is now open source; there’s surprising depth in its ancient code https://arstechnica.com/gadgets/2019/03/calc-exe-is-now-open-source-theres-surprising-depth-in-its-ancient-code/

Homework Statement Homework Equations - The Attempt at a Solution Here's my work : When I add the DC current source , it shows a red dotted line and won't connect to other elements . Any help would be greatly appreciated !

Dear Forum Members,, I would like to learn photovoltaics. There are some parameters like V(open circuit), Ishort, fill factor etc. And also i would like to learn the graph of intensity to Voc and Ishort. Could you suggest me to which source i need to look? Thanks

Alright. So I'm getting two different solutions depending on how I look at this problem, and I know one is correct but I don't know why the other would be incorrect. So, given this general circuit of a constant current source driving an RC circuit in parallel: Now, what they tell me in class...

I would like to know which books are the main sources for the Quantum mechanics 1/2 courses, and the professors use them most during their courses? Thanks for you reply in advance.

I need to collimate an extended source (for example a cell phone) to infinity or as far as possible. I show an illustration below The collimator lens is about 2cm from the eye and the extended source is about 60cm from the eye. My understanding is that a collimator lens with a focal length...

Homework Statement Find Vx, as the 5A current source provides 50W to the circuit. Homework Equations ##P = V.I## ##U = R.I## The Attempt at a Solution [/B] At first, as 5A current source provides 50W, by ##p=vi## there should be 10v through it. Then, i applied KVL and found four equations...

Homework Statement Find the Thevenin equivalent at terminals a-b V1 = 70V V2 (dependent) = 4Vo R1 = 10Kohm R2 = 20Kohm Homework Equations ##V=RI## ##1/req = 1/r1 + 1/r2 + ... +1/rn## The Attempt at a Solution Found the current i = 1mA by KVL using Vo = 10ki then did source...

My question is about the speed of light. Our current understanding of light says that light is constant for all observers, and uses time dilation to explain this. Have we proven this? The speed of light emitted from a stationary object is equal to C. The speed of light emitted from a moving...

A radioactive source emits particles at an average rate of 1 pe second. Assume that the number of emissions follows a Poisson distribution. The emission rate changes such that the probability of 0 or 1 emission in 4 seconds becomes 0.8. What is the new rate? Thanks.

If a source emits high frequency electromagnetic wave, for example gamma rays, does it imply that it also emits all the waves of lesser frequency?

Homework Statement Homework Equations Z = √(XC2 + XL2) XL = 2πƒL XC = 1 / 2πƒC I = V/Z The Attempt at a Solution First off, thank you for all of the help this semester. I'm sure you'll be seeing questions from me in the spring also. Here is how I'm thinking about this problem: 1. Using the...

Homework Statement An image of the problem is attached. I need to solve for ic(t) and vc(t) by adding a complex source. Homework EquationsThe Attempt at a Solution I don’t know where to start here. I don’t understand the question, and I can’t find the information I need in my notes. Can...

Homework Statement In the circuit diagram shown , Xc = 100 ohm , XL = 200 ohm , R = 100 ohm , the effective current through the source is ? Homework Equations Z= √( R^2 + ( XL - Xc)^2) Vrms = Irms/ ZThe Attempt at a Solution I tried to draw the phaser diagram and calculate the relation...

Are there any folks here who use open source alternatives to Matlab and Mathmatica for visualization of quantum mechanics? Also, are you aware of any introductory quantum material for that tool? If not, do you think such a thing would be worthwhile for visual leaners? Why or why not? I have...

Homework Statement An isotropic point source radiates electromagnetic energy, and its output is measured by a thin disc-like detector of radius R. Calculate the power measured by the detector at distance h from the source, assuming that the plane of the disc is orthogonal to the line of sight...

Homework Statement In addition to the question given in the attached file below, I don’t understand how is the polarity changing periodically. Homework Equations Concept-based question, I guess. The Attempt at a Solution I have no idea how should I approach the question. So, if anyone has an...

Just saw this article from a highly respected research team, and thought some might enjoy seeing how the state of the art continues to develop rapidly: 12-photon entanglement and scalable scattershot boson sampling with optimal entangled-photon pairs from parametric down-conversion Han-Sen...

In this circuit,first there will be voltage drop in the internal resistance of the voltage source.Mostly,the voltage source is assumed ideal in circuits,however,here a practical voltage source is assumed. So,there will be voltage drop in the internal resistance of the voltage source which will...

The speed of sound is 761.2 mph, or, according to my math, 1116.5 fps. If you are 8 ft away from the source, how long does the sound take to reach you? What is the formula for doing this? I divided 8 into 1116.5, and got 139.5 - but that doesn't seem to tell me anything. Obviously, the answer...

Earth is moving through space. If I throw a ball straight up, it falls down to me and is not left behind. This is obviously because it already carries the momentum of Earth's movement. But if I fire a photon straight up, does it also carry a velocity component in direction of Earth's movement...

Instead of using a single source and two slits, imagine just using two sources the same distance apart as were the slits... The two sources are controlled by a device that has two modes of operation, selected by a two position switch labeled D and R: D is "determined" - the emission from the...

good evening! My question is the following: it is well stated that energy is conserved in any isolated system, and we can in most circumstances expand our system to a many-steps conversion of energy, but always conserved. The classic example could be the energy of the sun stored in form of...

Homework Statement 10 v, 100 hz goes into a circuit of a 1o resistor, a 1o inductive reactance and a 1o capacitive reactance that are in series. What is the current. What is the V across the cap. Homework Equations and the attempt at a solution[/B] So I know I = V/Z and Z = sqrt( R^2 +...

Homework Statement The diagram of the electric circuit, the problem statement (and an attempt) are included in the file below.: https://www.docdroid.net/RD0ZEgA/question-3.pdf Homework Equations Dependent Current Source Nodal analysis Short Circuit Current Thevenin Voltage Thevenin...

Homework Statement A mass m attached to a spring of spring constant k emits sound at frequency f, detected by a collinear observer at distance r. If the mass has maximum velocity v_0, what is the total number of waves the observer detects in one period of oscillation? Homework Equations...

Read more at: https://phys.org/news/2018-07-century-old-riddle-resolveda-blazar-source.html and a second article from Ars Technica: https://arstechnica.com/science/2018/07/icecube-spots-a-neutrino-source-a-black-hole-jet-pointed-at-earth/ showing how multi-messenger astronomy is...

I don't usually need help in locating software, but I'm having a heck of a time tracking down a good open-source bit of software which solves integer programming problems using arbitrary precision! If I don't find one soon, I'll need to write it myself. Which I don't mind, but it's silly to...

The speed of light from a moving source of light is usually recognized indirectly, based on various explanations of phenomena. The speed of light is fairly simple directly measurable on the basis of autonomous and separate measurements of the frequency and wavelength of the light. Is a similar...

Looking at a humble smoke detector - a metal plate with some alpha source on one side. I guess the fission products / apha etc emitted in one direction are absorbed into the metal, and the opposite direction go into space. So there should be a minute net force ? Would that be useful as a "sail"...

I am looking for an IR camera that can pick up 1550 nm IR light source on the pix level. I have silicon wafers and I am going to hit the pixels with a 1550 NM IR light source and I want to be able to see the pix with a IR cam. I want to connect it computer and use a C# application to view the...

Thank you for your time and effort. It is much appreciated. 1. Homework Statement I have attached the problem with the solution to this thread. Basically, the problem asks to construct the circuit model for a generic device by using the data of terminal current and voltage measurements. From...

https://imgur.com/a/Yb2vpmp why can the inductor be treated as a 1A source?

Hi, I'm looking for open source projects to contribute to to build my resume and computer programming portfolio to hopefully land a computer-related job. What are good open source projects that I can contribute to?

Homework Statement Homework EquationsThe Attempt at a Solution I don't understand why would the current be zero in any of the branches . May be I am missing something very fundamental . Please help me understand this question .

I have a simple question I guess, basically by how classes etc are formed. In general a class in C++ has some categories such as private, public and protected, which okay everyone knows/can find what they are meant for. E.g. a private member will not be accessible outside the class member...

Homework Statement Hi, So I have a perfectly insulated rectangular plate and I trying to use the 2D heat equation in conjunction with numerical finite diference methods and MATLAB to see how the temperature changes throughout the plate. My issue is with the heat source. I am supposed to decide...

So I was doing some studying and got a question on why the rate of expansion of the universe was increasing, and it got me thinking. Newton's first law states that an object in motion will remain in motion with a constant speed unless an external force acts upon it. If the expansion of the...

Can anyone enlighten me as to why the total thermal energy of a star will increase with time if the star has no nuclear energy source?

If an electron starts from rest 85.0 cm from a negative fixed source charge of -0.135 micro coulombs we use the equation ke final - ke intial + pe final - pe intial. In solving you use ke = pe which appears to cancel out the inital kinetic and potential energy but how can the initial potential...

With the fastest sustained wind speeds in the solar system of 700mph. The main explanation I have heard is Neptune's primordial heat from it's formation combined with the lower atmospheric drag due to lower temperature. Neptune's southern hemisphere is currently in summer and has gotten warmer...

I want to start a project that requires parallel code for adaptive mesh refinement. I don't want to re-invent the wheel, and was hoping to leverage an open source library as a starting point. Does anyone have experience with any of these codes and could make a recommendation? At this point I...

hello i want to know if MCNP version 5 can define 8 sources by sdf card i need a help please

The light source in the DCQE experiment of Kim et al is a laser which illuminates two slits which are immediately followed by an SPDC. The latter is therefore excited coherently in two narrow stripes referred to as "slits". The output has a small amplitude of down-converted entangled pairs. The...

I'm modelling a scenario for the research that I'm working on, and I got the cells and surfaces all mapped out for the environment finally, but now I'm totally stuck on creating a source. I'd like a point source of Californium-252, but after hours of looking, I don't see any out of the 1000...

I've been wondering about this question for some time now. There are the following two contributors: ~~~~~~~~~~~~~~ 1. Heat left over from the planet's initial formation. In the early 19th century Lord Kelvin estimated the temperature based on a homogenous sphere of uniform initial temperature...

In the double slit experiments , with 'Single photon emission'. Taking into account the arguments above referring to one photon,, how do we establish that exactly one photon was emitted by the source. In the light of the above explanation , is it not possible that they are may photons in a...

Hi everyone, I'm new to this forum so I apologise in advance if I may have posted in the wrong forum or made a similar error. I recently conducted an experiment with some peers where we measured the voltage across a charging capacitor in an RC circuit over a period of time. The diagram is...

Homework Statement Hi, I'm just going through amplifier circuits and I'm having some trouble with amplifiers in which the MOSFET is biased by a constant current arrangement. Here's my issue: In the MOSFET saturation equation, if we set ID, we will be able to obtain Vgs. Which means that if...

There was a lot of discussion after the recent observation of the merger of two neutron stars about whether or not these events are the source of the heavier elements. See this thread, for example. This recent paper has some new analysis. Especially interesting is Figure 10, that I've...