Works Definition and 435 Threads

English has the letter 'e' with most frequency. Other language also have some of their alphabets appearing more frequently in text hat others. Why is this? Why don't all letters appear with equal frequency? Do humans speak vowels more comfortably? What exactly is the reason?

I have seen in books that when number of elements is small ~ 30-40 insertion sort is recommended. Why is that? The worst case of insertion sort is n2 whereas for quick-sort it is nlogn. nlogn beats n2 for all values of n isn't it? Then why?

Hello. Regards to all. I am working on an Organism Simulation Framework to simulate virtual organisms on low cost computers. I have already developed an alpha version of the project. To see the project, visit: www.sourceforge.net/projects/livmach Now I am in the phase where I require...

I think i have looked at like 20-30 web pages, and i can't find a simple step-by-step explanation of the operational principle. I know, that when a rare gas like Helium, relaxes from an excited state two characteristic emission lines occur. But how do you excite the gas in the first place...

Hi all; I'm trying to learn about classes and objects, here is a program that demonstrate operator overloading, i cannot understand how it works, when i tried this: //classes #include <iostream> using namespace std; class CVector { public: int x,y; CVector(){}...

7-seg display never works for me:( Im flippin out. I always have this same problem with 7-segment-displays having only touched on theory stuff I don't know why this 7-seg display won't work. I've attached up probes and it shows all the right outputs. ive fiddled with common anode and...

Greetings! I have this friend who had synthesis of nanomaterials as his MS thesis. After talking with him, I realized that his passion is on helping the farmers in the agriculture industry. I want to help him find a research group or professor (for his Phd) in which he can apply what he...

Very often the principles of faraday cage are extended to non electrostatic situations, i.e. situations involving time varying electric and magnetic fields. This means that the interiors of a metallic shell should be impervious to external time varying electric and magnetic fields. However, I...

Hi! When my Hydroelectric station is not connected to a GRID (islanded mode) I control the frequency or the speed, and here are the equations for my turbine: http://oi46.tinypic.com/3127ixe.jpg Look the third equation. I built that in Matlab Simulink, and my out put is turbine speed...

I'm currently writing a report on antennas and I am really struggling to understand the theory. Here's what I've got so far; Basics: .A moving charge causes a magnetic field .If the direction of movement is reversed, so is the direction of the magnetic field .A non moving charge has...

About a week ago, I learned about linear approximation from a great youtube video, it was by Adrian Banner and the series of his lectures I think were from his book Calculus LifeSaver. I truly thought it was so beautiful and powerful a concept. Shortly I also got to know the Taylor Series and...

Is there any serious work with calculations and explanations about this topic? Any references? I know that that digital watch is a combination of physics(piezoelectric effect) and logic, but i need to know much more.

General "How stuff works" video capsules, blog or podcast? Hey, I'd really like to spend a few minutes (15-30 minutes per day) learning about how random stuff works. Anything from electronics to cars to specific pieces of technologies, to industrial processes, etc. I'm posting in this...

1. Explain briefly an example of open loop system. At the same time, explain how this example works with the functions of the elements in the system. example is pop up toaster The Attempt at a Solution The pop up toaster can be set for the desireddarkness of the toastedbread. The setting of the...

I'm not sure if the way I understand it is correct or if it is slightly inaccurate, so I will just write it as I understand it and hope you can all my point out my errors. As I understand it, there are 4 dimensions. 3 of space and 1 of time (first question. Is time actually considered an extra...

Hi, I recently learned that to find the tangent at a point on any curve, you can simply place a mirror on that point and reflect the part of the curve on one side of that point such that the reflection flows smoothly into the other part of the curve on the other side. Once this is done, draw a...

I am trying to figure out what happens here...and now I've stuck on this... Here it goes..., situation 1 Both contact A with B and A with ground are rough We increase the force P applied here from zero.When there's sufficiently big μs between A and B than that of A and ground,there's an...

I'm not exactly sure how a vacuum works. I understand that there are machines (motors?), as in a vacuum cleaner, that suck air. There are other vacuum designs though, if I am not mistaken. It is these that I am not sure about. So how do these work?

Hello everyone, I have recently become interested in the physics behind the Star Wars saga and more particularly in the lightsaber. I have found an article on the web about, but not being very good in physics yet, there is a part which I find very hard to understand. I was just wondering if...

So MathWorks.com shows this as an example: [FONT="Courier New"]d = pdist(meas); Z = linkage(d); c = cluster(Z,'maxclust',3:5); http://www.mathworks.com/help/stats/cluster.html. I'm confused about why the routine gives any useful information. First it returns the Euclidean distances between...

Can anyone recommend me a device that has an electronic stylus and pad to which I can write, and my work is automatically saved into some format readable by a computer? The device should be wireless and thus have its own battery, and it should ideally (like the Kindle) have a memory so that work...

Referring to following video starting at 7:00 minutes, there are something related to gravity, I don't understand, Why can egg stand up without falling? Why do your muscles stronger in different locations? Does anyone have any suggestions? Thanks in advance for any suggestions...

Hi! I am about to start a project on the effectiveness of conformal cooling in injection molding, where i will be designing the cooling channels for a mold. However, i do not know which software will be better for designing the cooling channels and performing the finite element and heat...

I don't know what mole is and I read a lot of answers, is it like a dozen of atom, or is it like a unit, like meter?or is it something else?

Basically my question is, how do we know that the antiderivitave of a function represents the area under that curve? If you look graphically, you can see that the area of f(x)=x from 0 to 1 is 1/2 which agrees with (x^2)/2 but why?

Hey guys. I've been trying to make a simple clapper circuit that turns a LED on and off, obviously with a clap. I've tried countless models I have found online and none have seemed to work. Has anyone here used an online model that has actually worked for them? Could anyone give me the link...

How odometer works ?? I get a problem ,my university professor for physics 1 ask me to search about work of odometer in physical view ,I mean he doesn't want to describe the mechanical or electronic odometers !he wants me to write physical formulas and measure the distance which cars travel the...

How odometer works in physics ?? I get a problem ,my university professor for physics 1 ask me to search about work of odometer in physical view ,I mean he doesn't want to describe the mechanical or electronic odometers !he wants me to write physical formulas and measure the distance which cars...

Hello all, Apologies for asking a question as my first post. I am helping out a friend by designing educational displays for an environmental centre. I do the concepts, CAD design, operate the CNC router and assemble the various components. I am unemployed and only just starting tertiary...

Hello, I read a lot of autodidacts/self learners posts on here on good materials to begin with. Right now I am reviewing all of high school math and working through lots of problems to secure my math foundations. Afterwards I'd like to start working through some of the more classical works...

I post to this forum, because I want to analyze this phenomenon with the aid of those who may understand the various nuances of scientific theory, by which such a thing could occur. I do not feel that posting to a forum dedicated to audio/video would yield quality results. This matter...

"If it works in 3D, then it works in 4D" I've been watching Leonard Susskind's lectures on special relativity here. At time 0:59:40 he says, "If the vectors are Lorentz invariant, then if the first 3 components of a 4vectors are equal to the first 3 components of another vector (equation), then...

Hey everyone, I would like to first point out I am not a biology major in any way...I am a physics major, with a ever increasing interest in neuroscience. I am trying my best right now to find ways that I can incorporate my physics knowledge to the brain. Right now I am trying to...

I have been thinking about white light and having some trouble visualising how it actually works. I am aware that white light is made up from all the colours of the visible spectrum, my question is how does the light travel together in wave and photon form? my only thoughts so far are that...

hello all of you Why is (2, 1+sqrt(-19)) a maximal ideal of Z[sqrt(-19)]? How to show such thing? I thank you for any hints

Why does the choke help an engine start when it is cold? I know that the choke restricts the air flow and thus makes the mixture of air/gas entering the engine more concentrated with fuel, but why would that make it easier for the engine to start on a cold day? Shouldn't the engine be easiest to...

I'm thinking about all types of charging (LiIon, lead acid, etc.). I get the basics...but would really enjoy more info on the subject. Also...one thing that confuses me is how you can "overcharge" a battery...and how you can supply too much current (amps) to the battery. Since its generally...

Please, recommend me a book (or books) on basic math/pre-algebra that really explains how math works from the inside out. What I mean by that is a book that goes really deeply into exploring math giving you true understanding of what's going on behind the scenes so to speak. For example, why the...

Can someone please explain to me how space-time works? Is space-time a graph? If so how does it actually work? I just don't understand the idea of how it works. Is time treated as a constant so time is the same? Because if time wasn't the same I don't quite understand how you can relate space...

Homework Statement The changing variable formula in partial derivative f(u,v) x=x(u,v) y=y(u,v) (∂f/∂x)y = (∂f/∂u)v(∂u/∂x)y + (∂f/∂v)u(∂v/∂x)y I khow the how chain rule works, but I don't know why in the (∂f/∂u) v is constant and in the (∂u/∂x) y is constant Homework Equations The...

I'm making a 3D rotation of a poligon.The problem is when I rotate some points in 2D, it works, but if I use the same function to rotate the same points in a 3D perspective , while rotating the vertices move to the center of the object and remain there. I also wrote the 3D rendering part.At...

I know that FDM actually uses a division of total frequency of the carrier channel to separate into several smaller frequency channels. I want to know that whether these small channels are actually having their own waves over the communication medium or the carrier wave is modulated in such a...

I am from India.. I want a branch which has significant room for research works in future after B tech Mtec and so on.. Right now my preference is Electrical and electronics,Electronics &Ccommunication,Electrical Engineering, Computer Science.(need further suggestions from u)... Is it good or...

http://img689.imageshack.us/img689/7084/ujte.jpg This is a Relaxation Oscillator circuit with UJT. I need to A) Explain what is UJT, explain its relation ratio of η for the UJT, and explain what Vp is. And in B) Explain how does the circuit work, and what is the output (or turnout) of the...

I am a beginner at circuit design.i need to find a way to explain how an fm transmitter works which i do not so any of you my sincere friends can explain to me how the circuit below works and does the necessary calculations I'm in your debt Here is sample proteus file and circuit diagram :

Here is a link to a PDF file I found recently while googling for information on General Relativity. The author is apparently associated with Novgorod University in Russia. http://nifti.unn.ru/burlankov/burlankov.files/pdf/Bjern_e.PDF From the abstract Nearly 20 years before Einstein...

So I think everyone agrees that on the top of the list are Gauss, Euler, Newton, and so on. Yet it seems like as you get higher in mathematics, those names disappear. I mean, I'm an undergrad going for a math degree and I'm taking classes like Topology and Analysis, which came way later. All the...

Hello, I just learned that the derivative of e^x is itself and I was trying a few things to get my head around this. I mean, it's easy to memorize since there's only one such function, but if you look at the amount that it takes for the function to take the value of the tangent you will...

Can someone determine what this iteration works out to, where x' becomes x again each time, starting with x=1 and a and b are variables? x' = (1 + x) / (b (1 + x) + a)

Hoping someone can help me with some basic questions about resistor-capacitor oscillator (timer) circuits. I can put them together, I see them working, but I don't understand why! In the circuit in the attached drawing, if one installs the correct values of resistor and capacitor, I know...