Forum Definition and 338 Threads

I'm having a really difficult time understanding limits from the graph. I don't completely understand how to find if the limit exists or not. I tried to do these for my homework but I don't know if they are right. Could someone please help me understand limits?

I've made a few efforts to learn to program in the past, but I've never lasted more than a few days. What are ideas on ways to make it fun? Websites maybe? Or forums? For learning science/engineering principles, this forum is great. Do you guys have suggestions for ways to make...

Hi, I have been looking around for popular, well-used, and informative forums for alternative energy. I can't seem to find any great ones using google/bing/duckduckgo. If anyone has any suggestions it would be great! thanks!

Hi, why is the debunking forum gone? does it have to do with the fact that after the discovery of the Higgs. Science is complete and the universe is purely nuts and bolts and humans mere flesh and blood indistinguishable from animals and there is no mystery left in the world?

Well, the title really sums it up to be honest. Are we allowed to write our own stories and post it piece-by-piece as we write, here on this forum? If so I would love to do something like that. I may even include some of the members as characters even ;)

In this forum, it is possible for writers to ask for help with science-fiction or fantasy stories. Since science-fiction is speculative in nature, some degree of speculation is allowed here. However: There can be no speculation about the real world and about known science. Rather, all...

Do LaTex tables work in forum posts? I've never used them before. Today I tried copying several examples from pages on the web such as: \begin{tabular}{ l c r } 1 & 2 & 3 \\ 4 & 5 & 6 \\ 7 & 8 & 9 \\ \end{tabular} which on my browser doesn't show up as a table. I tried...

This is my first post on any message board so bare with me on any grammatical errors I make in the post. I will be heading into my senior year of high school and I plan on majoring in physics. But I live in a rather rural community and high school courses aren't considered challenging. We have...

i am new to this forum so if i do any mistakes then kindly guide me. i didnt know where to post this question of mine. i was wanted to go deep in physics, but in India not much importance is given to this field as a career and i was never motivated nor did i receive any help from any of my...

Hello, I am new to the forum but figured I could ask some intelligent people about an idea that has been bugging me. Here goes... I am trying to make a generator that is run by an electric motor but the electric motor runs off the generator head at the same time. The way I...

I never click ads, I use adblock plus, and I assume that most other people also rarely click ads. I know that ads can still be valuable by increasing my awareness of a brand/idea though. My question is: Do ads still pay well? I've read that online advertising is becoming less viable as...

Original Title: Please Need an help on this integral! Hi chamilka, :) \[\int_{0}^{1}x^{a+b-1}(1-x)^{c-a}(1-x^b)^{d-1}\,dx\] Using the Binomial series of \((1-x^b)^{d-1}\) we get, \begin{eqnarray}...

Hello... I'm trying to figure out how many magnets I need to put on one side of a piece of sheet metal in order to sufficiently magnetize all the surface area of the other side to a specific attractive force to other pieces of steel in contact with the sheet. It has been too long since...

I'm Sammy I've been lurking through the physics forums for a while and finally decided to start posting. I enjoy the good advice and humor I've seen throughout the forums. I'm glad to see that there's a forum community just for our kind of crazy. :P

Title: How do you do this problem? Hi mortifiedpenguin1, :) I presume what you meant by a "closed triangle" is in fact to show that the given three points are non-collinear; so that a triangle is uniquely determined. You can show that the points are not collinear by showing that the two...

Title: Find a standard basis vector Hi saqifriends, :) We can use the determinants to see which standard basis vectors are linearly independent with the given two vectors. \[\begin{vmatrix} 1 & 0 & 0\\-1 & 2 & 3\\1 & -2 & -2 \end{vmatrix}\neq 0\] \[\begin{vmatrix} 0 & 1 & 0\\-1 & 2 & 3\\1...

Hello,everyone. I want to know other Nuclear Engineering forum or newsgroup.Thanks!

Title: Prove this limit Hi sluggerbroth, :) \begin{eqnarray} \lim_{x\rightarrow 1}(x^2-2x+4)&=&\lim_{x\rightarrow 1}x^2-2\lim_{x\rightarrow 1}x+\lim_{x\rightarrow 1}4\\ &=&1^2-2+4\\ &=&3 \end{eqnarray} Kind Regards, Sudharaka.

Hello all, I am a mechanical engineering major who is fascinated with control theory. At my school you can specialize in controls as either a mechanical major, or an electrical major. Does anyone know if being a mechanical major is a disadvantage at becoming a control system engineer? My...

How do I write X bar with the bar over it to denote a vector? I discovered that if I compose a Latex equation here that I can copy it into a Word file. Is this true of all the symbols? Same for sub and super scripts. Is there a software tool that I can use to write Latex outside the realm...

At least as far back as the Greeks people have been trying to understand things by looking at lower and lower levels to find the first principles which determine all things. We break things into their components, and then into materials and then into compounds and then into atoms. This works...

I want to know how can I have the latex system on a vBulletin forum. I searched for it but there was so little about it. Thanks

Maths is a precice science*, but when using maths in the real world most people, including many mathematicians, generally take 'short cuts' which result in specifications of a problem or descriptions of a solution which are strictly incomplete. This has a number of advantages: it is quicker...

1. There should be a separate (sub)forum for NT. ... and one for abstract algebra, for that matter! 2. Show that there are infinitely many n such that both 6n + 1 and 6n - 1 are composite. Without CRT, if possible. My work... let n = 6^{2k}. Then 6n \pm 1 = 6^{2k + 1} \pm 1... Hmm. Having a...

I have to admit I'm a newbie to this forum. My background is computer graphics and physics simulation. I'm not a student but have 20 years of professional experience and an academic background (phd). Here some realtime inteactive physics simulations that may be interesting to you. Could...

Hello everyone, i am new in this forum , me very glad to see all the members of this forum , so please welcome em guys, thanks...

Homework Statement CD is playing for 74 min, starts at angular speed of 480 rpm then slows to 210rpm. what's the magnitude of the angular acceleration Homework Equations angular acceleration =ω/ t The Attempt at a Solution i converted the rev to rad then min to sec then divided...

Long story. Not a homework question, tho sometimes I think the person running the contest would think to use a forum contest to do his coursework. But it's not. Topic: Linear algebra. If no one gets it right after 3 days then we can use any means to get the question right, now becomes a race...

Hi, I am trying to come up with a formula that will generate a price based on its cost. The only trick is that it can't be something constant like 20% or 30% more than the cost. It has to be a formula that adds a bigger profit on smaller numbers and lower profit on bigger numbers. So on a...

Hi people, as you can see i am new in this forum. Sorry if i am posting in wrong section. Im going to try to traduce the problem. " f(n) is the sum o n terms of a arithmetic progression. " Show that : f(n+3) -3f(n+2) + 3f(n+1)-f(n) = 0 I just want to know if -3f(n+2)...

Hi everyone, I'm having some issues understanding how to approach (conceptually) a problem where there is a box with a ramp with static friction. The scenarios that are problematic to me are when you are pushing with a force horizontally and perpendicular to the surface. It's not a...

PForums, I am a writer working on a novel and as part of my job is to research the science behind any idea, I have to make sure is it plausible in real life. I did some research about three years ago for the novel I am writing and got the opinion from scientist and medical experts in regard...

Hi all I use Lyx v1.65 for creating LaTex. Obviously it displays OK in Lyx. It also displays OK with an online editor I've tried http://www.codecogs.com/latex/eqneditor.php But invariably when I try to post LaTex to this forum it does not work. I've tried the sandbox which the reason...

Anyone have suggestion on other forums that are more into antenna theory and design?

I have posted, but people are not wearing enough hats? Hi guys.

does anyone knows a forum specially made for maple so I can get my answers fast? Or will admins of this forums make a special section for maple so people can help each other faster?

Hello, I'm new to this forum, I'm not really sure if this is the correct board to post it on. But I've got a question, I believe regarding exponents and percentages. The problem I've got is that I have a number of 250 different items, and I wanted to know what the odds of randomly selecting...

Dear Fellows If I am on wrong part of forum then sory for that , I need some help regarding VOIDS,,, there are so many work done on voids titled as, PLANE WAVES IN THERMO-ELASTIC SOLID WITH VOIDS, and in abstract they said that , small voids are considered as pores in that solid...

Hi everyone... I found this forum while desperately looking for someone to help me with my statistics assignment, well not just the assignment, just understanding all the new formulas and symbols and things in general. I'm studying psychology and one of my modules is this research statistics...

Dear all, This forum is really great. Iam just wondering if there is any dicussion with regard to Abaqus matters. If there is one, please let me know which section that I should post the message to. For anyone who is not familiar about Abaqus, it is a Finite Element Analysis software that...

Homework Statement It feels good to be back after spending a month in the calculus and beyond section. Here is my question [PLAIN]http://img97.imageshack.us/img97/3883/unleduh.jpg Imagine a spring was pushed back by some distance x_0 and then it ends up at some distance 5m up the ramp...

Hi folks! I am new to this forum and have a question that I hope someone can answer. I have 4 circular holes, 3", 4", 5" and 6". I am covering the holes with 14 gauge sheetmetal. The sheetmetal is circular also and overlaps the holes 1" all the way around. My question is, how many pounds would...

Hi All, New to the forum, but requiring a certain amount of assistance if possible. In relation to ice defrost time, 334 Joules per gram is required to change the state of ice to water and 2.03 joules per gram is required to raise the temperature of ice by one degree? With this in...

Are there supposed to be significant differences in how LaTex is displayed in the Lyx editor and how LaTex is displayed by the processor used by this forum? On this forum, the LaTex expression \int_a^b f(x) dx shows an integral with lower limit a and upper limit b. When I ( as a novice...

Hello how are you all i am new in physics forum Whats up

I am a civil engineer and trying to master a structural analysis program called ETABS which is produced by CSI company. http://www.csiberkeley.com/etabs I am not sure if this forum is a correct place to ask relevant questions. Where do you do recommend to look for tutors and data about...

Hi, Does there exist any form for optical lens design? I am a beginner in this field and would like to find such forum, and have search physicsforums.com, but only found isolated threads without any dedicated subforum. Bob

hello i just sign up to thses forum recommended by a friend to help with mu assignment. i posted a few questions to get help on but no replies. how do i get more replies and help thank you

I have no idea about the topics posted on this part of the forum, nor have I had any slight experience about the things posted. Is this okay or normal if I'm still a first year ME major?

I keep getting great help time and time again. I'm kinda worried people would be sick of me, heh. I think the helpers see that I'm putting a lot of work (I always make sure to scan my answers and write clearly), and thought into the exercise, and I always make sure to thank them. But lately I've...