Idea Definition and 811 Threads

I am sick of these problems. I just cannot grasp these ideas at all and I'm really trying. But it's no use. And in the end, it's always something minor I'm overlooking. I am having issues with the following problem: Three moles of a monatomic ideal gas are heated at a constant volume of 1.90...

Calculate e^A if A = \left(\begin{array}{cc}0 & -2\\1 & 3\end{array}\right) Maybe using that e^x = \sum_{n=0}^\infty \frac{x^n}{n!} , then e^A = \sum_{n=0}^\infty \frac{\left(\begin{array}{cc}0 & -2\\1 & 3\end{array}\right)^n}{n!} but i don't know if this is the right way for...

i am finding damped SHM difficult to understand can anyone give sugestion as to what coul .do

I came across this in the AandC reference library posted by Marcus http://www.astrosociety.org/pubs/mercury/31_02/nothing.html My question is,Why do we seem to want a universe that started from "almost", nothing, or reduce our existence and our Us existence to as close to 0 as possible?

I was just wondering... It sounds like a silly question but I ask it with all seriousness. Given the nature of all the particles, waves, sparks, quarks, wimps and what-nots that exist in the quantum realm I am curious as to what type of material an idea consists of. If I share a thought or...

I'm sure most of you have heard that there's a proposition in Colorado (Amendment 36) that their electoral votes should be split proportionally among the presidential candidates. So if Bush gets 55% and Kerry gets 44%, Bush gets 5 votes and Kerry gets 4 votes. Anyway, I was wondering if anyone...

hi...im new here... im in 11th grade and need to submit a project and report (physics) for my internals... pleez give me easy to make experiments which is suitable for my grade... thank u nimmi

because in phys!.cs class, our project is to build a c.at@pu.It (to protect from any search). so i need any ideas that can help me become successful in this project and also bring my grade up. it's competition with the entire class, also. what are some good formulas that are a go with the...

free energy: please "chew and digest" idea Hi, I am new to this board.. but I've read enough about the nut-theories pertaining to "Vacuum energy", macro-quantum teleportation, and many out there ideas.. I do have an idea, that does pertain to "free energy", but before I am debunked.. let's...

What do you think of this?. I was a brainwave when I sat on the toilet :smile: . A typical jet engine compresses the air when it comes into the compressor, burns it with fuel, and expands it in the turbine. Approximating there is no difference of static pressure between the entrance and the...

hi just tinkering around with the idea of anti-gravity and i think i came up with something disproving it's possible, i can't explain right now (homeowrk) but i need to know if anyone has any ideas on how to break einsteins theory that matter cannot be created or destroyed. is there any way to...

I just wondered, that our view of how the universe is is ussually WRONG. We've made zero-viscosity fluids, materials with no electrical resistance, and just all together "non-sense" things. Is anyone willing to suggest then that there are materials that do not provide friction(when...

hello, from sometime in past i was in contact of the string theories. But one thing that clicked in my mind that how does the physicst started the idea of the string theories (all of them) like Newton formulated the law of gravitational force after he observed the motion of the moon...

I was reading the science fiction story "the gold at the starbow's end" by poul anderson (I think) which contains an idea for data compression. Poul Anderson suggested that a large number be compressed to the sum or difference of a few high powers of numbers. In the story it was something like...

I was discussing why I think the minimum wage should be raised with someone, and I came to this conclusion. I think the minimum wage should be raised, but not universally. I think that there's no problem with paying teenagers a small wage, considering their parents are paying for most everything...

hello grp... is there any algorithm of findin the total area of an intersecting plane. i have tried with set theory if a n b r two planes, area(a)+Area(b)-Area(a intersection b) but it takes such a long computation when u go on adding planes to the existing ones. I want to have something...

It's interesting that Lee Smolin used the idea of an evolutionary Landscape of physical law back in 1995 http://arxiv.org/gr-qc/9505022 We just had that young quantum gravity researcher Leonardo Modesto at Marseille remove the Black Hole singularity so that spacetime extends thru the...

Dear lovers of Physics Forum, Hawking’s statement on his new theory of Black Hole, which he delivered at the 17th International Conference on General Relativity and Gravitation in Dublin, Ireland on Wednesday the 21st July 2004 stunned the world when he admitted his mistake which he had been...

Hello everybody, Between two points on a line there are infinitely many points. Reason: A point have no dimention(no width,length or height) Do you have another idea ?

Book and site recommendations? Please post links to everything you know about space travel, quantum mechanics, theoritical physics of all kinds, rocket science, classical physics, psychology, computer science, geology, chemistry, parapsychology, and marine biology. Be sure to include not only...

Hi! I need to make a project in C/C++ for next year. I thought it would be nice if it will relates to physics. Right now, my only ideas are a virtual physics lab or a billiard game. Do you have any ideas/tips for me? Thanks, Or Ozery

Strange idea for exotic matter / antigravity I have spent quite some time on an idea I'd like to present here. Before I start, I'd like to make some points clear (due to some reactions I witnessed on other threads): 1. This theory has not been tested in any way, so I'm not trying to present...

Over the past year, I've evaluated my own research and observations and matched them up with some statements from a pair of friends. One worked on a nuclear sub, and the other worked on an aircraft carrier. Both worked in the nuclear engine rooms. As I've been refining the concept of...

Can I get an opinion on whether it is a good idea to go ahead in my physics courses? My idea was to cover material that I will be studing next simester...considering I have taken the prerequist math class.

It's called alternate realities. I think alternate realities are a bunch of fun. As I understand it, an alternate reality could, theoretically, be created when there is a choice. Like right now I could choose to post this, or I could choose not to. And as I understand alternate realities, it's...

If particles of energy and matter can be described as spherical standing waves, vibrations emerging out of of the vacuum itself, the equivalence of inertial mass and gravitational mass could be easily explained? (<-(<-(P)->)->) and (->(->(P)<-)<-) becomes (<-(->(P)<-)->) A particle is...

I been thinking... isn't the idea of powerlines kind of dated? I mean... Tesla did propose this idea of wireless power transmition like ages ago... Yet, today, we are using the same stuff they were using ages ago, nothing new... And, of course, wasting 1/3 of our nation's power plants to make up...

I have an idea of what topology is but I am clueless as to what applications it has? Anybody have any idea what topology is used for?

Help. i have to write a paper for my calc class and i have no idea what to write about. i was going to write it on fracture mechanics of different materials but that just got too boring. any ideas? it just has to use calc somehow. i know it should be really easy to pick a topic but i am just...

Let f ( x ) = {0, if x = 1/n for some natural number n or 1, otherwise Note: Natural number would refer to the set of positive integers Z+ that is 1,2,3,... Prove that this function is integrable on [0,1] and it's integral is 1 Certainly there are an infinite number of dicontinuities...

Rovelli has introduced an extended idea of diffeomorphism which is smooth except at a finite number of points. The group of extended (or 'almost smooth') diffeomorphisms plays a role in the Fairbairn/Rovelli paper that just came out and also in the key chapter 6 of the new book "Quantum...

-----quote from Woit, March 19 blog---- The Holy Grail of Physics It's pretty common these days for people to refer to successfully quantizing general relativity as "the Holy Grail of Physics", but it seems to me that there is a different problem that better deserves this name: "Why...

I was wondering if there were any known solid elements, natural or synthetic, which radioactively decay into a gas. It would be cool to watch a block of it become more and more sponge-like, and therefore less dense, as it decayed - structurally crumbling until finally no solid could be...

Don't know if this belongs in Social Sciences or here, so I apologize if it is in the wrong category. I need someone to tell me about the basic theory of evolution. I remember learning it during the 7th grade, and now I have a bunch of names and facts jumbled in my head. As far as I...

Everyone keeps discussing some forms of the big bang models for the creation of the universe, however upon reading hawkings The theory of everything, he discussed many models for the creation of the universe. One, that i found particularlly interesting was the idea of the No-Boundary Universe...

http://arxiv.org./abs/gr-qc/0402066 these people (at U British Columbia) study an idea for observing the effect of the cosmological constant (dark energy, negative pressure...) on the spectrum of Xrays coming from a black hole their conclusion is disappointing, the test they study...

Let's assume for the moment that beyond any doubt, global warming is real. Does this offer a viable solution to reduce global warming? Could this create another environmental disaster by loading the biosphere with aluminum oxide [apparently the preferred choice to be used in jet fuel]. The...

I just don't get it, I've noticed that over the last three days when my girlfriend and I kiss we both get a nasty electric shock, and a crack sound can be heard, its driving us crazy, I've tried wearing differnt clothes, differnt shoes, having a shower and bath, touching metal objects, nothing...

Imagine you are a computer programmer, and you have knowledge of the theory of everything and decide to put this equation into the computer to find out the most efficient way of living your life in opulent splendour. You plug in the equation and the compuet scans the surroundings and plots...

Here's an interesting idea I had today. Not trying to say it's true necessarily, just found it interesting and thought I should post it. It's adapted from an msn conversation (heh), so the style is probably a tad odd. :) We may be destined to live, but if we're stupid and make a choice...

This just out: http://arxiv.org/hep-th/0401087 Joao Magueijo <j.magueijo@ic.ac.uk> Lee Smolin "String theories with deformed energy momentum relations, and a possible non-tachyonic bosonic string" Smolin is one of the inventors of Loop gravity but also has authored and co-authored a...

Some may be aware that 10 years ago or so, Texas Instruments began manufacturing a display device using nano-technology. It consists of a two dimensional array of mirrors. Each mirror can be actuated to lie at a different angle. It is strictly a binary device; a mirror is at one or the other...

My first choice, for pure relaxation and scenery, would be Tahiti. Otherwise, I would really like to tour England. Can't afford it though.

Me and my other school friend have developed an idea for the perfect computer. It is not practical at this point in technology, and has some far fetched ideas. We were wondering if this could even be remotely possible. Plz Post comments. Ok, here is the computer. First, the computers mobo...

Is this true? Einstein's E=mc2 'was Italian's idea' Rory Carroll in Rome Thursday November 11, 1999 The Guardian The mathematical equation that ushered in the atomic age was discovered by an unknown Italian dilettante two years before Albert Einstein used it in developing the theory of...

I would like some opinions on the idea of rishons (Harari and Seidberg) please. Am I correct that this idea groups all sub-atomic particles in bunches of three? If so, wouldn't this come into conflict with the idea of mesons?

Anyone know just who (and when?) came up with the term 'multiverse' to describe the parallel or multiple universe theories? thanks.

I know that this is a subject of much debate among the fields of metaphysics, general philosophy, neuroscience, psychology, etc. Today I came up with an idea, I'm really not sure if others have, unbeknownst to me, thought of the same previously, or if I have come up with a new possibility. In...

Hello everyone! I've got a question from the book "Fundamentals of Physics/Halliday, Resnick, Walker" - 6th ed, page 395, #23P. A uniform rope of mass m and length L hangs from a ceiling. (a) Show that the speed of a transverse wave on the rope is a function of y, the distance from the...

if i used existing laser focusing tube, with lens and everything, and i drill two holes inside a tube, parallel to each other with conductors inside them so they make a spark gap, and discharge 320 kV inside it, would light that is emitted from air plasma be sufficient to make nice beam? few...