Forum Definition and 338 Threads

I have a strange problem. I am an active member of AudioKarma forum. 3 weeks ago, all of a sudden, the site is very slow in responding, when I try to navigate in the site, I get kick back to the main page instead of going into the thread I click. It's very slow, also, uploading failed or very...

Hello, this is my first question on Physics Forums and is a question on how to ask questions. I have been using LaTex for a while already. I wanted to post a thread about classical field theory. I tried to use \newcommand just to make easier the typing of expressions such as...

I have written a solution of problem in LYX. I exported the lyx code as latex plain code. I opened the latex plain code in Tex studio and copied it and pasted it in Physics forum and it didn't work. Can anyone please tell me what should I do? Should I again type the latex code here i.e.Physics...

Hi all, I want to create a private online forum for a small team of project members, and we will require LaTeX. I've been trying to google options, but most forum platforms do not seem to support LaTeX 'out of the box.' (Or at least I can't seem to find any that do... ) If anyone here is aware...

From now on, I will not post questions from each chapter of the precalculus textbook. I realize now that this site is not for that purpose. I will only post questions from the textbook that are interestingly hard.

Hello people, I'm really interested in non-mainstream physics but so far i can't find a place./forum where i can discuss or share theories. I've tried doing it in the Quantum Physics section, but my thread was rejected because personal theory developments are not allowed here. So far it's ok...

Experiment / demonstration: Set up military surplus command tent as camera obscura / pinhole projector for observation of full soar eclipse. Problem: lacking in personal knowledge of the formula needed to determine correct focal length to hole diameter Solution: Request assistance from actual...

Hi Folks, Newbie @mechanicalengineer had posted a thread (I think it was in the ME forum) where he asked a vague question about how to run 5 DC motors at the same RPM without using feedback. A number of users tried to post helpful replies, despite the OP's thread start being so vague. Turns...

So I was solving a problem and I had to find the solution for ∫dx/sen(x) and I found this, but because the forum is in french I wasn't able to understand the solution :P (especially the last two steps) Thanks!

Hello MHB Gurus I'm writing this section but I'm not sure if is the right one I wonder if is possible to import an Excel Table (with copy and paste) from excel into the forum with line and boarders Thank you for your help 7 mag 2014 10:20 1,3928 7 mag 2014 10:25 1,3926 7 mag 2014 10:30 1,3925...

Can you guys tell me how to install LaTeX in a forum? Thanks for advance.

I am very interested in the French New Wave films of the 1960's and would like to find a forum to help me learn more about them, but so far no luck. Any recommendations?

I mean what is the most common way people do this? I was using something called chemdoodle but i couldn't figure out how to number the atoms. Is chemdoodle the best or something better? thanks

Hello All, I'm Kris. So I need your guys help. I have to spend 6 months in jail because of a protective order violation :( - Facebook conversation with my ex. Anyway, I plan to use this time to its FULLEST, and get a kind of "primer" or head start. I've always wanted to get a degree some kind...

Hi folks, My name is Kevin. I have a BS in Chemistry (1984) and an MBA Finance (1994). I worked in the plastics compounding business for over 20 years. I retired early, now GR and physics has become a hobby of mine. I'm a little thick, so I have hard time understanding some of the material. My...

I am using SAS (sweat and suffer) for many years now on a daily basis in work and it would be nice to be able to exchange here some problems. However, searching for "SAS" in physics forums only turns up tons of post related to science advisors (SAs).

I was wondering if anyone knows of what type of law is involved with the terms of service of internet discussion forums. Is it possible through terms of service for a discussion forum to legally own poster's posts? Thanks!

I have some students that I am willing to tutor for free if they come here first, but I want to provide them with the information that they need to post questions with LaTeX if need be. They are freshman physics students. Are their any Youtube type tutorials for this? I looked, but found...

I had created a thread in the chemistry forums regarding the addition of thiols to vinyl ethers. The question was proper and "was not homework/numerical/objective question". I just wanted to know if the reaction was correct and the question was "not given by teacher/not taken from problem...

Dear Physics Forum, I really don't understand the concept of watt and Newton. I have two questions, perhaps someone can explain it to me. ======================================================= Case 1: If a one Newton force is applied to a one kg rocket in space with no or very little effect of...

Remember Voyagers? Travelling through the endless void of space, carrying the species-scale equivalent of teenage poetry etched onto what is called the Golden Record. Full of naive hope and good intentions, cute to think of, but increasingly embarrassing to look at, it was sent in an...

Does anyone know a good Artificial Intelligence/Pattern Recognition/Graphical Models/Probability Theory forum?

Not even care if this question is within the rules, but just knowing it is a good question...I already tried various google searches, and I wish I could find a languages & linguistics forum that is of the same level of quality as physicsforusm - but about languages, linguistics, translating...

Hello Integral and all the forum members, Before approximate 8 months I read that some big companies begin to invest a lot of money in change the wafer size from 300 millimeters diameter to 450 millimeters diameter, in these days one friend tell me that he hear that all the industries in...

Homework Statement A exp( (− 3 R^2)/(2Na^2)) I wish to integrate ^ The expression is equal to P(N,R) The limits are infinity to -infinity. The intention is to find the normalisation constant / A in terms of N and a (then to cube it).The Attempt at a Solution This is what I've managed. A S...

How can I type in latex style symbols when I am adding new posts to my threads

Hi everyone! I was curious as to the demographics of PF forums, so I posted this poll on where the respective members of PF forums live. Please note -- in this poll, I am only asking which country you currently live as a permanent resident, not where you were born or raised, or what citizen you...

Hello, I am taking MATLAB this summer and will be having a number of questions on this forum about all my bugged code when I make it. Before I begin, I was wondering how do people add those ''code boxes'' when they make a thread that shows all their code within the post. Thanks Example: Post...

I am not going to look up specific threads to support that assertion because I assume they have been seen by all those who regularly read threads on the HUP. If necessary, I'll dig up a few. The two points of view expressed in various threads are as follows 1) Simultaneous measurements for...

This interesting problem was posted on another math forum (http://www.sosmath.com/CBB/viewtopic.php?f=6&t=62620): The probability that a six sided (possibly loaded) die lands on the ith face is P_i . The P_i are unknown. We are given the values of S_i = the probability that the i_th...

Hi, I was thinking of something: How are one supposed to calculate the moment needed for a scoop to scoop up a sample of e.g. sand? Does the classical p=mv work? Any ideas or comments?

Homework Statement I don't know much about physics, I'm using- F=m*a Homework Equations So say we got our 2 containers with a straight passage between them (they're cylinders for the sake of the question), and the right one has double the radius. So I'm assuming there are 2 forces...

Hi y'all, I am new to the physics forums. I really like Astronomy and Physics. This is a sort of a homework question but I couldn't find the right category to put it in. I have an english paper due soon and I need to find a topic. The paper is supposed to be about a controversial issue. I've...

Hi, I'm new to this forum and I could use some help. I'm a freshman in high school and for a school project, we have to make a magazine. My group and I are doing a tech and general science magazine. I'm writing a feature story on metamaterials, and a future where they are abundant. We need...

Mellow, all Physics Forum member, Please help me to have the answer of question, Why electron spin is +-1/2. What is the reason of integral spin of subatomic particle?

If I want to start using LaTex on the physics forum, is the best way to do it just to learn all the coding? This seems like quite a task for me (I've never learned any computer language thing). I downloaded MiKtex (LaTex software) and was hoping that it would somehow write up the proper syntax...

Hi there, I'm a first year PhD student and was going to ask the forum for some advice on some maths (specifically Fourier) that will be used in my work. However, I wanted to know what the forum/general policy is on what happens should this work ever be published. Would a forum contributor be...

Homework Statement In the electrochemists technique of cyclic voltammetry, the peak current, I, is a simple function of the scan rate, v, according to the Randles-Sevcik equation: Homework Equations I = 0.4463nFAc(nF / RT)^1/2 D^1/2 V^1/2 Where n is the number of electrons transferred, F is...

Hello MHB, I am just curious about how many in this forum got apple product :) I got one apple product which is Iphone 4s. Is there also anyone against apple?Regards, $$|\pi\rangle$$

Here is the question: Here is a link to the question: Prove this limit. I have posted a link there to this topic so the OP can find my response.

In order to help with server load, we are splitting up the larger threads. This is a continuation of the original Where's That Landmark? thread located here https://www.physicsforums.com/showthread.php?t=270543&page=480

I haven't taken a course in years, so I don't know how modern teachers and tutors use the internet. It occurs to me that one interesting exercise would be to have a student ask a question on various forums, collect the posted answers and then have the student or the class critique them. Anyone...

I am new at the forums and still getting used to writing in Latex. I found that it is easier for me to write my LateX in this editor: http://www.codecogs.com/latex/eqneditor.php and then copy to the physics forum. So, I wanted to ask you guys, do you know any other tricks you want to...

I need to purchase a dress suit for some upcoming research presentations but the Men's Wearhouse in my area has terrible reviews and I don't know anywhere else that sells suits. Anyone know where in the NYC area to buy a suit or any other forums to ask about this?

This forum is ONLY for the discussion of existing science fiction and fantasy stories in movies, books, tv, comics. It is NOT for discussing personal ideas, those would go in the Science fiction WRITING forum if they adhere to the rules for that forum. This forum is not for new ideas or...

Hi n PF, Is there any IRC for Physics forum or similar thing... So that I can ask my doubts real time... Also for windows7 which is the best IRC software. -Devanand T

Homework Statement A tank consists of two chambers, one open to the atmosphere and another closed and filled with a gas. The two chambers are connected by a sluice opening. What is the pressure in the gas, in gauge and absolute terms if the barometric pressure = 742 mm Hg. Difference in height...

Similar to this one, but for Economics where you can get help with Homework, assignments, theories you don't understand, diagrams etc... Thanks!

I was talking to my physics teacher today about electric motors and used some information I learned here. I'm not calling you guys wrong by any means, I just would like to know what is real. He claimed two things: 1. As load on an electric motor goes up, current goes down (I know this is wrong...

I’m a layman new to the Cosmology Forum and just finished reading through the very helpful, “Effort to get us all on the same page (balloon analogy anyone?)” by Marcus et. al. followed by “Look 88 billion years…”. [If you’re in a hurry see the nice summary by Mark M at cosmo.pdf.] Along the...