Works Definition and 435 Threads

WHY do vernier calliper works? Homework Statement This is not exactly a problem but i think this is the most appropriate place to post this. I know how to read a vernier calliper. But i want to know WHY it works. I mean how it gives us the true length. Homework Equations The...

How do sacrificial metals protect the less reactive metal that it protects? Some people say that it provides the iron with electrons when it starts to rust. But if it does provide electron to the iron then the magnesium block for example will become positive ions. But then how can the magnesium...

So I am trying to make a motor controller circuit. The idea is, that when the polarity is in one direction, the motor turns one way (which you can vary the speed) and when the polarity is switched, it turns the other way (which again, you can vary the speed). Also LED lights illuminate...

So I've had many wonders about the whole unbreakable speed of light and what an army of scientists at CERN did. I already know they said it was a broken fiber optic cable or something else which caused that, but let's assume that what they were saying was true, then my questions arises...

Hi, I'm a sophmore in high school, and I haven't taken the Physics course yet. So I'm a bit green. Anyway, I was playing around with an electromagnet I made with a nail and some 1mm wire, and I've got a few questions about the magnetism it generates: -First, why does that iron core need to be...

So, I was working with the Fibonacci sequence this afternoon, and I stumbled onto something that maybe a major discovery to geometry, I don't know if it is or not. So, I began working with the golden spiral, and began drawing it. After drawing it, I noticed you could draw circles and more...

Homework Statement Why is the length of time over which a phosphor emits light an imporant factor to consider when designing a television screen? Homework Equations The Attempt at a Solution I have gone over the last three chapters in my textbook for the answer. I even drove to...

I downloaded largestcomponent.m today and it runs fine on my PC (Win 7 Enterprise SP 1) but when I try it on my Linux machine (Ubuntu 10.04 LTS) I get this message: ? Undefined function or method 'largestcomponent' for input arguments of type 'double'. Even if I put the function file in...

How do these new cold asphalts, that allow to repair potholes filled with water work? What chemistry/mechanism allows them to be so easy to manipulate at normal temperature and then rapidly solidify in a permanent road solution?

I looked for hours and hours and I haven't been able to find any video or link [there's one REALLY bad video on youtube] and I REALLY need to know how a current balance works because that specific chapter that I'm studying on electromagnetism has questions mostly coming up with the current...

my circuit doest works...please help i had simply connect a vibration motor to a 1.5V battery,and motor start to vibrate. but i have to use a potentiometer in my circuit,since the motor has to operate in range of 1.2v-3.8v...so i had used battery of 9V instead...but my motor doesn't works...

How do you get photos to become entangled? And is this even possible, or just a theory?

Do atoms themselves violate thermodynamics and relativity? If I have an atom in a completely isolated system where there's no energy coming in or going out, let's say it's already at it's ground state since the second law of thermal dynamics implies all systems will eventually lose all...

One of my life goals is to really just learn how a computer works. I want to learn all the mathematics it takes to understand how a computer works, i want to know the history of it, i want to basically go back to first principles of how a computer works and understand how it evolved into it's...

This sounds very hokey (in a metaphysical way), and I am sorry for that. It isn't, it is a very serious question... A number of years ago a friend gave me a "healing wand." It is nothing more than hard copper (water) pipe(maybe a foot long?), and a natural quartz crystal "point". But...

K A Stroud Engineering Mathematics 6th ed frame 133 change 0.526_{10} to octal(base 8) form method: every time only the decimal part multiply by 8 \begin{array}{r}0.526\\ \times8\\\hline\\4.208\\ \times8\\\hline\\1.664\\ \times8\\\hline\\5.312\\ \times8\\\hline\\2.496\\\mbox{... goes...

I`ve read that in thermoelectric cooling the current passes through a two different materials and because electrons start to slow down and radiate heat cooling is acheived. But why not to use in this case a usual resistance instead of expensive metals? For example we will place coper wire...

http://pokit.org/get/a93c079249cf42fc35c8be34ce9db362.jpg So I built this. With some minor adjustments. From my previous experience with astable multivibrators, I know that capacitor size means a lot. So I put 100uF instead of 1uF and I put a variable resistor, linear 1k, instead of R2 so I...

Looking to learn physics about how a bicycle works and if it effects projectiles because of the rotational inertia if a bike was to go off a ramp. any suggestions?

Referring to following video, does anyone have any suggestions on how dowsing works to locate water source? Thanks in advance for any suggestions

How does gravity work? This seems to be one of the most often asked questions and one that has consumed many people. It appears no one really knows and no one is saying. Einstein, Newton and many other ingénues minds have offered formulas and analogies that beautifully calculate or predict what...

Hello, I am currently in an analytical chemistry course where I am required to write a report on Raman Spectroscopy. The typical description of Raman Spectroscopy is the excitation of an electron to a "virtual" state, whereupon it can relax to a non zero vibrational level in its ground...

I would like to know more about how Radionics Therapy or any kind of vibration can communicate remotely through a hair sample or digital photo, which is used to "locate" my energy and to transmit radionically to me. Does anyone have any suggestions on how it works? Thanks in advance for any...

I read about methods of encryption and I guess that they work only when you are online. But, I was astonished to see Compress or Encrypt attributes in Properties --> General --> Advanced. Please explain what's the need of encrypting any folder and what happens when a folder is encrypted. Frankly...

1. Vinko Rajic is talking about in his videos on YouTube that he can use telepathy all the time and 100% correct on few kilometer. Uri Geller could give evidence for telepathy at Stanford University. 2. At Edinburgh University, experts conducted controlled experiments to see if...

[PLAIN]http://www.barometerplanet.com/wp-content/uploads/2009/09/merc_barometer.jpg What makes mercury rise in the tube?Does atmospheric pressure carries the mercury in the tube?Is that true?

Somehow stumbled across this website Can't tell if it's made by a real physicist as a joke/parody or by someone who was dropped a few too many times. It looks like a lot of effort went into those diagrams though...

Hi, I have a pully with two sticks attached to it as shown in figure. Each stick has a mass in it...which is free to move...and equal iin weight. Assume each mass is equally distant from the pully...what would be the torque on the pully ?..And in which direction the pully move ?

Does anyone have information on how exactly a atomic clock works? I have had advanced quantum mechanics courses so I am sure I wil understand it. My problem is that I can't find any descriptive materials (with drawings), the wikipedia page is very vague about the different things. So can...

I am Neurology student , today I get email from one person that can use telepathy. Is it possible that telepathy works on the distance of few kilometer? I can not find any document on any existing person today that can use telepathy but I found Vinko Rajic and Uri Geller and they are talking...

Is it needed to be a genius to do difficult intelectual work? Is every theoretical scientist that does important work a genius? This is bugging me lately. Sometimes I'm going to do some things but I think "If you do this right you can be considered a genius or atleast a very intelligent...

Hi, I am green to QED. I could not find any more detailed answer about more exact description of atoms' repel process, both on the forum and the internet. Let's say we have a swarm of water steam particles, hitting each other. Some will join and stay together to form larger droplets, but some...

Well, I want learn how the computer works and for understand all about computer I decided make one, I see this site: www.mycpu.eu and it's very complete but he isn't explains the electronic foundations and physicists of what he has done to construct his computer (he not explains how he has...

Hello everyone, I don't know if this is the right section to post this but I want to know what does the clutch in a manual car do. I have absolutely zero knowledge on car mechanics and would be greatful if someone can explain this to me simply. 1. Why do you need a clutch? I don't...

[b]1. Homework Statement [/ Using the approximation, explain why the second derivative test works approximation=f(x0+delta x, y0+delta y) delta x and delta y are small... Homework Equations f(x0+delta x,y0+delta y) The Attempt at a Solution ok so i know the first derivative...

Greetings, I have recently bought a roboduino http://store.curiousinventor.com/all-kits/roboduino-kit-servo-ready-freeduino-arduino-compatible.html . I have tried uploading programs from my computer (a Dell Inspiron 1525 Vista) using Arduino 0022, however it does not seem to work. At first...

This is just for grasping the concept of the Black Body curve and the UV catastrophe. I don't understand how ideal Black Bodies work? or how they absorb and re-emit the energy which they absorbed? Also, why does radiation bounce around the walls of a cavity of a Black Body? shouldn't the...

I watched a video explaining a card trick today, there were no tricks, it was all based on math. Here's the set up: 52 cards in the deck. person A takes some of them, then person B takes some as well. The dealer counts the remaining cards in his hand, say he has 18. Then he says...

So I'm degasing a solution in a glovebox. The way we did it is get a rubber septum that can cover the bottle opening. We stuck a needle through the top of it, as well as a glass tube with a porous end. We used the needle to create a vacuum in the bottle by hooking up it up to a pump. The glass...

How Chemistry Works? Hey friends, I was just giving it a thought about how the science of (inorganic) chemistry works. Are all the theories formulated just in order to explain the chemical phenomena, such as bonding? Do these theories hold place for creation of new compounds based on the...

Find the largest δ that "works". Homework Statement Find the largest δ that "works" for the given ϵ: \displaystyle \lim_{x\to1}2x = 2; ϵ = 0.1 Homework Equations N/A The Attempt at a Solution Given ϵ > 0, then: if 0 < |x - 1| < δ then |2x - 2| < ϵ ϵ = 0.1, so, |2x - 2| < 0.1...

I know an electron microscope can collect x-rays emitted by electron holes, backscattered electrons as well as secondary electrons. I get that an electron's wavelength is much smaller than a photons, thus you get finer image resolution, but how exactly does a shorter wavelength mean a finer...

let's say we do not know the proof. then how do you guys describe it conceptually? hm...><

Hi friends, Can anyone please explain the how Lawn Sprinkler works. Thank You, Yaswanth

I was thinking about how does the 3D glasses(not the one with red and blue lens) work. My first idea is that the lenses are polaroids with orthogonal polarization. So I got a 3D glasses from a cinema and try to prove it. I wear the glasses properly(with the arms on my ears) and then look at...

Hi All, I'm trying to understand how transistor works. I have drew some pictures for NPN transistor to show my current understanding. Can you please verify this for me. On the picture: "-" and "+" are movable charges; circled "-" and circled "+" are immovable ions. 1. No voltage applied. Two...

I've been trying to understand this but there are some points that lead me to confusion. The first is that a lot of people have been saying the the chemical reaction in the battery starts when you connect the two ends of the terminals to a load. I figured i guess the reaction won't take place...

Hello everyone, :smile: I am trying to understand how a transistor works. Let's start with a NPN transistor. I read somewhere that NPN is just two diodes joined by sandwiching their 'P' regions between the 'N' regions. In other words by joining their anodes together. Please have a see on...

In the movie TRON, was TRON good or bad? and how about CLUE, was CLUE good or bad? If the programming of themselves into a computer was just programming, how come the main character said they were not programs, numerous times, how were they in a computer/ digital world if they were not...

Hello everybody. I am somewhat confused about how a siphon works. Attached is an image which will hopefully help me explain. In the top left corner of the image, a classic siphon is shown. My question is however directed at the second image. If i was attempting to siphon water over a fence from...