Thread Definition and 503 Threads

After participating in a more algebra-oriented REU last summer, I would love to try working in some area of geometry of topology this year. Unfortunately this seems to be a pretty rare field for REU topics. Here are the programs I have found so far that have geometry or topology projects...

Hi, I'm learning Bipolar Junction Transistor and need help to confusion which arise so I will keep posting questions which I don't understand to this thread. Thank you in advance. So my questions start: When using hybrid pi model and t model, we determine the dc operating point first. In one...

Stimulus spending (split from "cap& trade" thread) Don't worry, Obama can spend $10,000,000,000 per year for 10 years with one hand tied to the tele-prompter.

I want to tap a NPT (NPT-3/4) thread hole on a plate. And I found some related standards, these standards told me the detailed dimensions of the thread. My question is how to machine the NPT thread with a tap? How to control the parameter mentioned in the standards? thanks in advance!

I can't decide what I should make for supper. As this is a semi-regular occurrence, I figured I would pawn off the decision on you guys ask you guys for advice. I can't be the only one who has trouble deciding what to make all the time. Just post whatever you're making for supper each day...

Homework Statement Hello, the question itself is pretty abstract. When pulling a thread roll, there is an critical angle, where the thread does not start to unwind itself. Instead, the thread roll itself starts to move. Derive an formula for determining that critical angle. Homework...

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Afternoon everyone, I am slightly confused... Basically, i will be purchasing a force transducer from a company called HBM. Now, on their data sheet it shows that there are two tapped holes either end of the transducer, designated by G and G1. I am using a 125kN transducer, and for G...

I've been browsing the forum, but I haven't found a way to solve this thing, which has been frustrating me for quite a while, I'm trying to develop a simulation of cue formation and propagation on cars on a single lane road, and of course, I have to compute the acceleration of vehicles obeying a...

Probably a stupid question but... I have a device with a bolt that is designated #6-32 UNC. I need to drill a hole in a surface to for this bolt to fit into. How big should this hole be? If the material I am going to be threading the bolt into is plexiglass do I need to thread the hole I...

Yet another "Which Career/Major?" thread. Hi, recently I've realized that I really need to start exploring majors/careers soon. I figure everyone here would be knowledgeable in that. I'm not sure what kind of information is needed, but here's what I think is related. If you're too lazy too...

https://www.physicsforums.com/showthread.php?t=335357

Where was my MS in CS or MS in IS thread moved? Can it be accessed from the main forums page? If I can't find it, how can anyone else. Thanks, cswave

hello everyone, this is my first post. Right now I am trying to figure out which equations to use to solve the following. I will have a block that will a threaded rod through it. This block will be next to another larger block. In between these blocks are going to be metal samples. Now...

"L di/dt" vs. "i dL/dt" I have heard many times that the positive "inductive" part of a circuit's reactive power is equal to "L i di/dt". I also know that "L di/dt" is just one of two terms that is derived from applying derivative of "L i" with respect to time. The other term is "i dL/dt"...

Yet another "which math course to take?" thread Dear PF members, First, I would like to apologize in advance for asking this type of question repeatedly. I just haven't made my mind yet, and I just think getting another advice from PF members might be helpful. So, I'm going to be a...

If we can shoot a photon outward, at velocity c, why is it that the body that shot it outward is not traveling away from the photon with velocity c?

Please delete << berkeman merged two threads >>

I am trying to do some preliminary calculations for a basic lifting device but some of my numbers seem to be out-of-wack. Could some kind soul take a look if you have a minute spare? Motor Data (max efficiency) RPM: 8311 = 870 radians/sec Torque: 9.213N-cm = 0.09213N-m Output Power = 870...

It's one of my passions. There were a few earlier threads in which it was discussed, but I decided to start a new thread devoted to mountain climbing and trekking. The 2009 Climbing Season in the N. Hemisphere is in full swing. http://www.k2climb.net/news.php?id=18533...

i've been away more than 5 yrs and can't find the thread that used to tell you how to code latex. you could practise there too without burdening others with your errors. where is that thread? or something similar? in friendship, prad

A while ago I saw a rainbow while I was driving. The end of the rainbow lay right on the hood of my car. When I came to a stop, I popped the hood to see if there was a pot of gold in there. Of course, by then the rainbow was gone and so was the gold. I said I would post about it, but forgot...

I thought it might be fun to have a thread to make your head explode! By means of posting some of your favorite mind-bending paradoxes. I just heard a new one (for me) today that I thought was pretty good, thought I'd share! What if Pinocchio said "My nose will grow"?

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]

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]...

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...

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 _...

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...