Request Definition and 194 Threads

I have a question that is not present in any physics book I've ever seen: Supose I have a rocket with infinite fuel, but it's mass is constant. This rocket's power is limited and can only provide enugh thrust to accelerate it self at a rate of just over 9.81M/s. If I were to lunch this rocket...

request for water level sensors circuit! anyone got the water level sensors circuit? can share with me? really appreciate !

dear all, I am eager to read the "Gauge Theories of the Strong and Electroweak Interaction" wriiten by Manfred Böhm,Ansgar Denner,Hans Joos. But in my country, there's no the book. If you have the ebook or know the web sites to download it, please send it to my email(wuleihnu@yeah.net). Thank...

Hi all. Let me first mention I am academically way out of my depth at the forum. What I wanted to find out was which equations I need to study to play with an idea I've had for a while now, related to what appears to be a recent popular movement into 'the unified field theory through...

Can anyone identify the word something like "Einsatzunghomöomorphismus", and give me the english translation? It is the homeomorphism where you evaluate the elements by plugging elements from another space. Well, that is not a good sentence... Suppose you consider the polynomial...

Homework Statement The motion of an object is described by the equation x = (0.90 m) cos(PI*t/5). I needed to find: The position of the object at t = 0 and at t = 0.40 s; I got (0.9) and (0.8718) meters, respectively, which were correct. The amplitude (0.9 meters) was also correct...

So for my vday present to my n3rdl0ve I am making him a comic book staring HIM. I am trying to think of some "Adventures of" my superhero boyfriend for the book and am drawing a creative blank. I am having problems because I don't know *that* much about mathematics so am having trouble...

request book! I need a book, please help me. Handbook for the Assessment of Soil Erosion and Sedimentation Using Environmental Radionuclides thanks

request...with UPS cct can anybody please help me... i want a simple UPS cct using full bridge IGBT or Mosfet with output 220/240v 50hz i need the driver cct for the IGBT or Mosfet as well...please...

Hello, This is my first post on the forums. It's mostly elicited by anxiety about getting into grad school. I have seen a bunch of similar posts, and extrapolated as many data points as I could from them (in terms of where to apply, etc). But it's always nice to receive personalized...

Hi Folks I made a mistake on a web page I created a while back and because I had nobody to help check my work the error stayed there until today. I hve corrected the error and made a new page with a different decay process. I originally used Uranium fissioning into two other nucleons and...

Hi (I hope I'm posting in the right place) In physics class we are currently working with projectories of comets etc. that reach the orbit of planets, and get pulled in by its gravity. My teacher is currently doing the work in an excel document, but has requested a better solution for...

Homework Statement My professor set us an online quiz in IUPAC nomenclature. I managed to get all of the problems correct, except for one. The graphic shows the molecule and my attempt at a solution. http://img67.imageshack.us/img67/8673/14ne9.gif The attempt at a solution If you can't...

I am so very sorry, but I did not know where to put this thread! I would like to request any helpful links and/or tutorials relating to basic discrete dynamical systems, or any help at all! It should cover: linear one dimension difference equations; non-linear one dimension difference...

Hi, I am writting a book about programming game physics engines, much along the lines of "Game Physics Engine Development" by Ian Millington, however the focus of the book is Networked physics engines. At the current time I have not been able to find a great deal of literature on...

Will there be a forum directed specifically towards packages like LaTeX, Mathematica, Maple or MATLAB? Anyway, Does anyone know where I can download the package that uses .jpg in LaTeX or what the name of it is? Thanks

~~one serious request!~~ One serious request ... Can anyone tell me ... I have got ProE woldfire 2.0 But I couldn't find a suitable book for the same version. All I can find is the book for proe wildfire3.0 .. but can't buy the software of Pro-e wildfire 3.0 .. ..so I will have to stick...

Would anybody be able to provide me with data concerning the band gap of colloidal CdSe quantum dots against their size?? I am currently using CdSe dots with a ZnS shell, capped with HDA. Any relevant information would be much appreciated. Many thanks, David Cunnah (studying PhD in opto...

Hi All, I have an undergraduate degree in computer science and engineering and master degree in computer engineering. Currently I am doing my second masters in nano technology. After this master degree, I like to do research in area related to QM e.g. qunatum cellular automata, Quantum...

Help.. datasheet please Hello Everyone... I got this electronic device of a machine control unit, I can't manage to find any information about this device. The label says " MSC 03906GRF - 0043 ", the symbol of the device is attached, please if anyone has any information or where to get...

I was wondering whether anyone knows if (and where) I could purchase the solutions to the book "Physics for Scientists and Engineers with Modern Physics" (may not be the exact title) by Randall D. Knight. This would help me an incredible amount. Please reply if you know.

I'm having a helluva time trying to build the index for this code. First of all, this is homework, I'll admit, but I've done all I could to research the problem on my own, so I understand the question I'm trying to ask by now, but I still haven't found an answer Basically, I'm modeling...

I've wracked my brains out trying to prove this identity. If anyone could offer some suggestions, I'd greatly appreciate it! (sin(x))^4+(cos(x))^4 = 0.25∙cos(4x)+0.75

EDIT:request filled EDIT:got it. Can someone please post the exercises for Chapter 3 of Real and Complex Analysis by W. Rudin, 3rd edition. I have checked-out the 2 edition from the library, but our class uses the 3rd ed. and, the exercise #'s don't match between the two editions (and hence...

Hi Everyone I have a request to make. I had back surgery and I have a nasty staph infection. It is not behaving nicely. I have to go back to the hospital tonight (Brigham and Women's Hospital, Boston), ER first of course. For those of you who are religious I would like to make a request...

Hello I have math question that I am struggling with that apparently can be solved using code (or reasoning - I tried that and mine didn't work. GO figure :confused: ). Can anyone help me out? Here is the question: A coffee club with 8 membres meet every MOnday Wednesday and Friday...

Hey, I am looking for some recommendations on books covering partial differential equations and another one on complex analysis. I don't have a lot of extra money, so I am kind of hoping that someone has experience with some of the Dover books, and could possible recommend any of them? I...

i once posted askign if a frequently asked question sticky could be sorted. i think i'd like to restate that request following bs's two threads a quick search of "recurring" finds around 7 threads obviously starting with the question 'is 0.9 recurring one?' the second yet again involved...

I am looking for a definition. I know the word but I forgot it. This topic came up when a friend of mine were talking today. What is it called when an outsider comes into a primitive society (or observing a pride of lions, ect) and the presence of the observers contaminates the environment...

Hello everyone, I am searching for a whole course on undergraduate Astrophysics which cover some topics like: formation of stars/accretion disk/hertzsprung russel diagram/ energy transport and generation in stars etc.. I have been searching only to coming up with some course either very...

I've always loved talking about physics with people, unfortunately none of my friends are really interested in it at all. Are there any people on here, mainly night owls that go on MSN messenger and would like to talk about physics, chemistry, and those sorts of topics? If so, PM me, it's...

Hi Does anyone know the projectile motion equations in which the acceleration is NOT constant?

Let me start off by saying, I am terrible at math. I'm not even sure if I know how to explain this for you to understand, but here goes. I am trying to obtain an equation for series of numbers, with a repeating pattern. The numbers must be greater or equal to n. The first series of...

I work in a restauant and use KOH and NaOH as degreasers. Will these damage our septic system if I put them down the drain? Would it be better to send them to the landfill? Is one less harmful to the environment than the other? Personally I use them as spareingly as possible but I know...

I am told by dw (aka david waite) that there are people here who have posted a comment stating how they love his website, which is at http://www.geocities.com/zcphysicsms/ and that they have told dw how "excellant" it is. Actually to be precise dw tells us that I'm curious who these...

Thanks .

Hello all. I've been studying QM for some time, and it's going well but it is lacking mostly because I'm having a very difficult time grasping the finer points of tensors and differential spaces. Let me start with this - could someone please kind of give me, or direct me toward, a tour of...

Dear all I know that torque = rxF, but I don't understand the concept of torque. Would you mind teach me? Thank a lot. Good Bye Billy

Ok for all us 'mature guys' (see masturbation thread) we now have a thread about POO we will start by thinking of as many words for poo as we can - Poo - Dung - Manure - Excretement - Faeces - Stool - Droppings - Muck - (according to MS word, Fertiliser and...

Hi. I'm to compare science and religion for some schoolwork that I'm doing in a religion class. I'm to find out how this universe was created in the first place. According to what I've been hearing, vacuum isn't 'nothing'. Vacuum is a quantum field where particles can appear for a short...

[SOLVED] Tensor Analysis - Request for opinion Seems that a few people refer to things like vectors and tensors as quantities which are invariant. For example Dr. Bertschinger (Cosmologist at MIT) has online notes at http://arcturus.mit.edu/8.962/notes/gr1.pdf "Introduction to Tensor...

My good friend's wife is dying of cancer. She has "final stage, inflammatory, breast cancer", or something like that. I need whatever information (perhaps some links or references) anyone has on the possible cures (particularly something "natural"). Also, does anyone have information on...

Hi again, I'm doing a bit of research about the positioning of the galaxies (the local group in particular) and I was wondering if there were any lists available where the cartisian coordinates were already calculated as apposed to translating them from the polar coordinate vectors.

Lie Algebras in Particle Physics (Frontiers in Physics), by H. Georgi. Perseus Publishing; 2nd edition (October 1999) Introduction Intended as an introduction to Lie theoretic methods in Particle Physics, the book starts with the operator treatment of angular momentum, the analysis of...