Thread Definition and 572 Threads

Hi, I am trying to calculate the capacitance of a non-parallel plate capacitor and there has been few discussions on this research in this forum. Some of the people have pointed to this material by Fred Erickson, The material link is not valid anymore. I was wondering if anybody has...

Homework Statement A 2.60 g spider is dangling at the end of a silk thread. You can make the spider bounce up and down on the thread by tapping lightly on his feet with a pencil. You soon discover that you can give the spider the largest amplitude on his little bungee cord if you tap exactly...

Another black hole thread... So what exactly is the difference between a rotating black hole and an non rotating BH? I am not exactly sure what the difference is so i decided to ask the enlightened ones. Thanks all!

This thread is about TED. Clip 1: smart people art. [url]7zT7iKmfrCU[/youtube]

Hi guys I've been lurking around these areas of the forums and was inspired by another fsrum to create a 'happy thread'. You know I've been seeing a lot of dismal news lately and how mad/angry/sad everyone is but how about how good was your day, what's making you happy? What was your little joy...

This thread is intended to give high school students the necessary information to cope with university level mathematics. I find the “who wants to be a mathematician” thread too convoluted to be of use when looking for books, and that it serves college students more than k-12. Nonetheless, it...

Hello, [aside] So I've seen a lot of medical physics related posts on this forum recently, as well as some good answers to questions (thanks go out in particular to Choppy!) and would like to get out-of-the-way my support for a medical physics subforum. Anyway, on to the point. [\aside]...

I just watched a cooking show on tv which showed how they always boil lobsters till death. We people have done some sadistic things in the past. Being cooked to death was one of them. How long could one survive?? I'm thinking you'd die pretty fast because water is such a fast conductor...

There is no reason single people can't have a good time on Valentine's day! We just need our own holiday, "Anti-Valentine's Day": http://www.msnbc.msn.com/id/17011635/ Happy Anti-Valentines, single PF'ers!

The "Get Well Christina" thread lisab already poured hot chicken soup on you so I thought I'd start a "get well" thread. Get better!

I have this strange feeling, the solution is almost ready, I believe we are already entering the age of Free Energy. But no, it won't happen overnight. If I may ask, what source of energy exists anywhere in the world? Constant and is always available, completely safe and doesn't emit harmful...

I have a reciprocating pump running 350 RPM, 2.25" stroke. Piston is double acting (ie: force in both directions). Load is ~30,000 pounds. There's a very small clearance in the coupling between piston and drive train, and this coupling goes through the same motions as the piston (it is...

Hey, Borek! How have you been man? I haven't heard from you in something like two days and was wondering how life's been treating you. Probably should have sent this as a PM, but I wanted the whole world to know just how much I love you in a completely non sexual, manly sort of way. Plus I...

Amidst the current financial crisis, and possibly heading towards a recession (if not already in one), it begs the question as to how did we get into this mess. Then, when one starts looking into the system, something seems a bit confusing... if a recession means that the majority of ppl does...

I'm a horrible player, but i very much like the game. I also like to read about some of the great chess players. Recently i read on Jose Raul Capablanca (1888-1942, Cuba). Word has it, he entered a tournament with all of the world top players at the time, while he was relatively unproven...

This is a thread for all us nervous Fall 2009 grad applicants. All my applications are in and all my letters of recommendation were sent in. I don't want to post any stats or profile data until I get my admissions decisions in. Where did you guys apply? What field do you want to pursue...

A place to come if one is bored out of their pants and can think of nothing better to do. Or just have a general moan, like our power went of today and it is taking ages for the house to warm up again, my plates are frozen. And the bin men left my bin at least 6ft 7inches out of possition, and...

Just for fun, thought I’d throw this out for discussion. What do you think is the best way to call out an SAE straight thread port on a drawing? For example, you could call out all the individual dimensions so that every machine shop would be able to machine it even if they’re not familiar...

A former classmate of mine had a senior management position with one of the Fortune 100 companies, but he left it for a small startup company. I thought it appropriate to start a thread on Entrepreneurship. http://www.econlib.org/library/Enc/Entrepreneurship.html...

I have been working on a holistic system involving flywheel-generators and http://www.lightoftheworld.com/profiles/blog/show?id=1591481%3ABlogPost%3A2884" as the power source. With all of the recent publicity given methane as a potential source of energy I figured that this was the way to go...

I am in search of 1000 5mm x 30mm Allen Head Thread Forming/cutting zinc plated steel Screw but can not seem to find this particular screw anywhere! Does anyone know where I can find this screw? or possibly have it manufactured? Thank you, Mooref2

Hi, I'm laughing, after having passed more than one hour on a very simple program I could finish it. It does the Euclidean division between 2 numbers that one type. It is very inefficient I agree. I gave up doing it in a more efficient way in order to simplify it (for my brain at least)...

So for the Autumn picture contest I chosed an awesome view of the Danube valley. Unfortunately the sun wasn't that bright that day. So the choice was scenery versus light. Scenery won, these were the losers:

Hi all, I am trying to solve numerically as well as model the electric field lines coming out of a electrode (not a point charge) in a dielectric medium. ANy suggestions would be greatly beneficial _________________________________________________ _ separated by d + separated by d _...

Hey PF, I just had a question for anyone who has been through the aerospace application process. I am intending to probably go for masters in aerospace, but in the application, what looks better, to select MS or PhD for the program I want to apply for? That is, is it better to look ambitious...

So how does the single person survive, there is no one to do your washing, make your meals, shop for you, pull the splinter out of your------, mop your brow when you have the dreaded flu, hells bells you have to do every thing for your self, according to modern society you should be dead, apart...

Exception in thread "main" java.lang.NoClassDefFoundError: I was getting this error trying to compile some java programs in SSH Secure Shell. Then I made a simple "Hello World" program in my home directory to see if it would compile by typing 'java HelloWorld' but all I got was: Caused by...

In your opinion, what are the most lucrative jobs going to be in about 10 years? My thoughts: 1. Nuclear engineering 2. Nanotechology 3. Medical - Vanguard

Reducing it to three questions, because I'm pretty confident on the others. 9. Find the volume of the solid generated by revolving about the line x = -1, the region bounded by the curves y = -x^2 + 4x - 3 and y = 0. --- I graphed everything, and then translated the graph 1 to the right making it...

yes i know there's one right beneath me, and i actually posted in it but my question is a little different than that poster's. I'm actually a physics student at a university at around the junior level and i want to pursue theoretical physics. now i know everyone says this because it sounds so...

Some time back I made a thread saying I would be buying a calculus book. I ended up buying Apostol as the Indian edition is only 6$. I have made a thread about this because I can see that there are going to be lots of problems I cannot do and I haven't a solution manual. 1.\int (a2 - x2)ndx...

Horizontal Waterwheel (from: "centrifugal force" thread) This is all over my head, but I'm in the water and I want to learn,:eek: Maybe you guys need a mechanical challenge to apply your classical physics to:rolleyes:. I know very little of what has been said, or how to make calculations...

Post any thing you want to build but have not time/resources to do so, I want to build a three wheeled electric powered car, i have ideas to make it a practical home build project, first the body will be a monoquoc made from ply wood, the front suspension will be a (unit) that bolts to the...

I am starting this in analogy with "the Food Thread". The point of this is to thread is to house people's comments and to collect their resources and to foster discussion about the highly important and relevant-to-our-daily-lives topic of human nutrition. I want people to post here particularly...

So, I am attempting to learn linear algebra on my own and I am using Sharipov's "Linear Algebra and Multidimensional Geometry" since mathwonk is always ranting and ravong about it. So far, I hate it. Clearly I am not a mathematician at heart. I thought I could periodically post questions...

OK. I am coming back to CA, U.S.A. after several years for university from another country. I left U.S.A. about 10 years ago. And now that I am coming back there are many things I need to learn. So I thought this would be a good place to learn about the general things I need to know. So...

Every once in a while, a thread comes up that has 'something' to do with the 'Arts'. Past ones had the 'chicken' on the roadside, discussions about Pollock, avatars, etc. So, I thought this may be interesting. From paintings to film to dance to your or your child's art, whether a...

I filled the kettle ready to make coffee then the phone rang, after taking the call i wondered why the kettle had not boiled, the kettle has an indicator light to show it is switched on, the kettle felt cold 5 mins after i filled it, so i got the meter out and started testing the element etc...

Homework Statement Two boxes $A$ and $B$ are connect4d by a lightweight cord and are resting on a frictionless surface. The boxes have masses of 12.0 kg and 10.0 kg. A horizontal force $F_p$ of 40 N is applied to the 10 kg box. Find the acceleration of each box and the tension in the cord...

Motoring. With fuel prices so high it seems a good idea to try every way we can to save fuel, Are there any TESTED methods that save fuel, any gizmos that actually work? Take for granted that your vehicle is in top running order, engine tuned, brakes running free, tyres at correct pressure etc.

There has been a spate of writing in the popular media about the debates between scientific teams regarding various WIMP (Weakly Interacting Massive Particle) detection devices in the search for Dark Matter. (Example: http://www.nytimes.com/2008/04/17/science/space/17dark.html?ref=space from...

oohh nnoo another "i want to quit smoking" thread Guys, I haven't smoked a single cigarette since three weeks now ! I have decided to keep up with the no smoking policy in my life. Some effects : i eat twice as much, i have twice as much energy and it seems to me that i am tasting my food...

Hi, Homework Statement Just having some troubles with a proof i have been asked to do, (sorry for not knowing the math code) basically, f(1)=0, f(2)=1/3 and f(n)= ((n-1)/(n+1))*f(n-2) and I've come up with the conjecture that f(n) = 0 when n is odd, and = 1/(n+1) when n is even...

FranzBear lives again!

Greetings, 2+ months ago, someone posted old entrance exams to a graduate school (physics) I think it may have been USC but I'm not sure. I didn't download it and now I can't find the thread with the link Can you help? Thanks Sparky

[SOLVED] HWK and how much work is required (rant about hwk thread) I have a question...it is said that in the physics introductory thread and I assume elsewhere that your supposed to do work and SHOW IT...HOWEVER it's not funny how if you do too much work people ignore you as well...I think...

hey want to post a thread with a polling option. I have ticked the box saying I want "x" amount of options... But where do I type what the options are? I.e if it was blue vs red... Where/when am i able to type this to get red and blue next to the polling options? Thanks

:biggrin: Well, we have a food thread, but chocolate is a special case. I was watching a news program during a flight yesterday, and one of the pieces was about the Valrhona company, which makes gourmet chocolate. So I thought it would be appropriate to start a chocolate thread -...

This thread is for anything related to Photography. I am quite new to photography and I do not know a lot about it, so any pointers would be great. I've seen some really great shots in the competition threads, so let's see what PF has to offer :cool: Hosting your Photos I use...

Homework Statement 6^1+6^-1 / 6^1-6^-1 (Question is to evaluate that, but I am going to venture to guess that we are supposed to somehow simplify the question a lot further. We just finished learning all the exponent laws) Explain how you can tell which is bigger without evaluating...