Works Definition and 435 Threads

http://arxiv.org/abs/1101.4298 The missing link: Merging neutron stars naturally produce jet-like structures and can power short Gamma-Ray Bursts Luciano Rezzolla, Bruno Giacomazzo, Luca Baiotti, Jonathan Granot, Chryssa Kouveliotou, Miguel A. Aloy (Submitted on 22 Jan 2011) "Short Gamma-Ray...

I am not a science guy, but I have been trying to find out how a nuclear plant works and I think I get it; however, I am not clear what it means to bombard something with neutrons. I think I understand how the process continues due to the chain reaaction, but how do you start the reaction.

Yes i am aware this may appear a stupid question, but I am just starting science refresher course and was not able to find an answer so far by googling. So far we are being taught the classical view of gravity. Its a property of mass... and that appears to be it. There is no mechanism...

Homework Statement The problem is the attachment. Homework Equations The Attempt at a Solution I am not sure what the appropriate answer is. Any suggestions?

http://www.youtube.com/watch?v=7A4Qxx7j63Y&feature=related

Im trying to understand how a Geiger tube works. So there is a wire in the middle of the tube and then an outer metal shell and the wire and the shell are held at a potential difference. And the tube is filled with a gas like Neon , And when like an x-ray comes in, it ionizes a neon atom and...

Why is it that the group SU(6) gives you the correct wave function for hadrons made up of the u, d, and s quarks? The 6 elements in the fundamental representation would be u up, u down; d up, d down; s up, s down. What's the meaning behind SU(6)? Also, for 6 quarks, would it be SU(12)?

In the nowadays posh Oslo suburbia of "Bærums Verk" (where there previosly was a an iron works plant, founded in 1610), a moose family, on the third year in a row, has become a welcome sight. This article has a few photos of them...

Hi, I am not sure if this new motor/device as shown in carvenmotors.com could work and I would like to know a engineer's piont of view It seems to be a piston but with less parts... do you think it really works? Have you seen any operative? in which aplication? Thanks!

if linear and angular momentum are separately conserved how dampening works? like in a suspension of a car

I would like to start a discussion involving how sound works. I've read plenty of websites but none can satisfy the level of curiosity I have. To get started I would like to know what it means for low frequency to travel farther than a high frequency all sound waves travel the same speed? The...

I am having a hard time understanding how come the right hand rule will tell you the direction of a vector that is perpendicular to other two vectors. I mean, I've seen some examples of a current flowing through a wire, which created a magnetic field around it, if there is a positive particle...

I was just wondering what my options are for internet access. Things I've tried: Dial-up (unlimited monthly data WOOHOO! but at the max speed of 56kb/s it's only 14MB...) Satellite (sucked tremendously, 200MB daily download limit) Verizon mifi (currently using, still pretty bad, 5GB download...

This is probably a really stupid question, but I don't know where else to ask it. I am a layman watching Science channel, the show "How the Universe Works" episode called Alien Galaxies. In it they described the large scale structure of the universe, and talked about the Sloan Wall, which is...

I'm using my nintendo wii for my gamecube games and I just read in the maual that it's ok to remove the panels on the side to plug in the memory card and the controler if the system is horazontal whitch mine is I never done that before and I was woundering if it would hurt my system the maual...

hey everyone I am new to the site an new to physics ( bare with me if I am not as smart as some ) , =) ok, i have this friend who is world widly known for his work, but cut this short, he uses electricity an crystal an can do some out of the ordinary stuff with this he has been in numerous...

I am very interested in reading the original works of some famous mathematicians, such as: Cauchy Lagrange Euler Gauss The Bernoullis Riemann etc. I have found the their respective works have been collected in volumes (for example, Cauchy has 27 volumes!) but they are all in their...

Please remember that I'm not a science or physics student, so please explain as simply as you can. Thanks. In the case of DC current electrons flow from a negative terminal to a positive. A negative terminal is full of electrons and the positive is electron deficient. I'm trying to understand...

I am very curious about how people think in words alone for a long time and am hoping that some of you here can enlighten me on this topic. When i try to investigate the subject almost all that i come across are articles on how people think visually which for me is normal and therefore of little...

Hi, I didn't see any kind of thread with this topic so I figure I could post it here. I'm sure there are a lot of really creative people here, and I would love to see what kind of works of art that might be floating around in the collective minds here at PF. You can post anything that would...

Homework Statement The remainder theorem can't really be applied when dividing by something other than a linear equation since you wouldn't know what a is, right? Homework Equations The Attempt at a Solution

Hi, just wondering how I could make a circuit so that it would only work when one water sensor if touching water while the other isn't. Here's a quick http://i539.photobucket.com/albums/ff356/AnneFTW/Random/WaterPump.png" and replace the buzzer with a pump, but how do I use probes with two with...

Please remember I'm not a science or computer student - quite a layman in these areas. Please be as much explanatory as possible. Thanks. I'm struggling to understand how a computer works at basic level. They say it's all about 0's and 1's for computers. But a computer is an electronic...

Hi everyone, I've been looking at the data sheet for a pulsed laser diode driver that I've been using, and I've managed to convince myself that there's a mistake. I was hoping that if I post my explanation of how the circuit shown in the data sheet works, that you guys can either confirm that...

If let's say we have the following expression √(x^2 - y^2) If I wanted to factor out x, then why can't I just take x out because a square root of a square is the base. x√(1 - y^2) But it turns out that the answer to this is incorrect and the answer to factoring out x is. x√(1 -...

A person in his early 20s becomes mentally very passive, his brains doesn't really work, when he is in a public place such as a university lecture hall. The topic which is an easy task when he is alone becomes a mammoth task when surrounded by others. Could you please help me to identify this...

This works on so many levels here, I couldn't resist. https://www.youtube.com/watch?v=4va2s6w4nFE

Hello. I know that most fission reactors boils water to move a turbine like this one. Is the same for a future nuclear fusion power plant, produce heat and boil water? Some light about this please.

Hey Respected seniors, I want to know that how the hydraulic motor works? Im working as a trainee engineer in a company.. I watch daily a machine that have hydraulic motor, pump, solenoid valve... All these things are for the movement of a shaft which is connected to a jack( I see, there...

Hello People . I am first year electronics engineering student . Recently I wanted to try hand in electonics projects. And I am planning to do flashing led electonic kit given over net. I couldn't understand how its's really working. I have no idea. People help me . Advance thanks...

Anyone have practical experience with the propane (or vinegar/baking soda) CO2 emitters which purport to reduce mosquito problems? End of biting season for this year, but would like to have an effective approach for next year.

Model the arterial tree as a simple branching network in which each junction is composed of a parent vessel and daughter vessels, each having a diameter related to the parent's via the cube law (D_n-1)^3= (D_n*a)^3 + (D_n*b)^3 which is approx. equal to 2*(D_n)^3 a.) Show that D_n/D_0=...

Homework Statement Prove the correctness of the following recursive algorithm to multiply two natural numbers, for all integer constants c ≥ 2. function multiply(y, z) comment Return the product yz. 1. if z = 0 then return(0) else 2. return(multiply(cy,[ z/c]) + y · (z mod c))...

hello ppl Imagine that you are on a spaceship flying very close to the speed of light and we know that time slows down significantly at this speed relative to that on earth. now say every day for the persons on the spaceship is a whole year for a person on earth. So for a person on the...

Homework Statement Consider a simple circuit that looks like a rectangle (the cables), with 4.5 V attached on the bottom. The electrons are traveling from - to +, let's say I1 = 10A, which means they have an average velocity v1. Now put a 1kOhm resistance near the + side of the battery. I2 =...

Nasa uses chemical rockets in space right? On Earth I could understand how they work, the one reaction produces an equal and opposite reaction. So on Earth the rocket would be pushing on air to propel itself. But there's no air in space... Edit:::: I added an s to "works" in the title, my bad

I'm sorry this is not really a school question i was just intrigued and did not now where else to ask about it. I have seen videos of these Gaussian guns and they appear to generate energy from nowhere, obviously impossibly. So what is the physics behind how they work?

As far as I know, they use two coils and rely on a changing electromagnetic field to transfer electric current. So would wireless charging not work for DC current since a constant voltage would create an unchanging electromagnetic field and therefore unable to induce a current in the other coil?

I was wondering what the physics is behind how a centrifuge works and how to find the (radius dependent) g-force exerted along the centrifuge tubes. I look at some online sites like wiki etc. but they weren't really clear. Thanks.

I'm looking for a program that simulates physics systems in Ubuntu. I tried using Step but it's a KDE system, and I've been having a lot of issues with it hanging up and crashing. My searches thus far have pulled up nothing. Does anyone know of any good programs other than Step?

A friend of mine (an old man in his 70's) watched the History Channel shows on The Universe and the Big Bang Theory and all that and asked me - "so what if the universe started with a big bang? what good does it do me by knowing this fact? why worry about all this stuff in the universe when...

What is the minimum work needed to push a 1000 kg car up 45.0 meters up a 12.5 \circ degree incline? a. Ignore Friction b. Assume the effective coefficient of friction is 0.30. Work: W = (F*d)cos\theta Coefficient of friction: W = \muN(d) What I did: W = (m*g)(d)cos\theta...

My abstract algebra book is talking about reducing the calculations involved in determining whether a subgroup is normal. It says: If N is a subgroup of a group G, then N is normal iff for all g in G, gN(g^-1) [the conjugate of N by g] = N. If one has a set of generators for N, it suffices...

Homework Statement [PLAIN]http://img708.imageshack.us/img708/8725/mathhelp.gif I can kinda see that p(x) will be smaller than L1 and larger than Ln, but I have no idea of how to prove it. As a side note; p(x) is really the rayleigh quotient. Please help, I sat up till very late last...

Why superspace formulation works only for at most 4 supersymmetries? For more than 4 supersymmetries, why some of the supersymmetries would not be manifested? What's the consideration here? &_&

Why does the moon have a decelerated velocity on one half of its orbit and on the other side it has an accelerated velocity. And why is this same with the earth. From my data the variances in velocities of Earth affect the velocity variance of the moon. So I have been able to create a formula...

how can you determine if there is a moment and how does it works?

I am reading some introduction on Fourier optics. In the text, the simplest example would be a single len system (focal length f) with an object f(x,y) sitting on the front focal plane of the len while the image is the corresponding spatial Fourier transformation F(\frac{x}{\lambda f}...

Nevermind, it's late and I realized why it doesn't work because I forgot to take into consideration that the denominator is (1/polynomial) Anyone care to explain to me how to do it the proper way? [SIZE="1"] 1. Question 1 \int (x+2)/(x²+x+1) dx The only reason I ask is because my...