Thread Definition and 548 Threads

Homework Statement A coil of 25 turns of wire is suspended by a thread. When a current flows through the coil, the tension in the thread is reduced by 4.0 ´10-2N. http://members.shaw.ca/barry-barclay/Self-Tests/test11/Magnet20.gif Homework Equations F=IBL B=nμI[/B]The Attempt at a Solution...

Hey everyone! So, I am in a dilemma. I have a mathematics bachelors degree with a minor in physics, but many more course than just a minor, really it is like 2-3 courses away from being a second major. Anyways, after I received my math degree and physics minor I got cold feet about going to...

Dear PF Forum, Does anyone know how we can save our favorite threads INSIDE www.physicsforum.com profile not in our browser? Thanks.

As a graduate student in applied mathematics (solid mechanics, elasticity) I find the process of writing difficult and I have been getting better at it progressively and very slowly. But as a hobbyist video game developer, I have opened a "work in progress" thread on my game in a game...

I just finished my sophomore year as an electrical engineering major. Now I've got a summer free (well, I work until 4:30), and I'd like to use it to self study something (one or more topics). So far, I've taken Calculus 1-3 as well as an ordinary differential equations course. I've taken two...

Hi, I'll describe my problem more specific. I have a continuous flow of this polymer thread (polystyrene) at 465 °K (190°C sorry I'm metric) that needs cooling down. It passes trough a water bath which is kept at 310°K (35°C). Now i try to calculate the heat exchange into the water, to...

Not kidding http://mysteriousuniverse.org/2015/04/nasa-may-have-accidentally-developed-a-warp-drive/ Astounding, is it true?

Since https://www.physicsforums.com/threads/wait-for-it-wait-for-it.746296/ is closed, let me open a new thread about a paper which appeared today: http://lanl.arxiv.org/abs/1503.09045 :biggrin: (By the way, this is my 5.000th post.)

The NCAA Men's Basketball Tournament is my favorite domestic sports event. Anyone watching and cheering for a team? Anyone with an alma mater in the tournament? I'm cheering for Wisconsin! Hoping for a few upsets in the second round!

Homework Statement NUMBER 271 Homework Equations Not Really Sure The Attempt at a Solution No Idea where to start, I looked up the law of Tangents and it seems to do with that. Please help! :) I am also confident that it has to do with equilibrium?

Hello, I am looking for resources on scale symmetry including the persons who are at the forefront, arxiv preprints, history of the development of the idea, and any other sources you can think of. Thank you.

I posted one of these threads for the 2014 summer internships. Please post what you apply for and don't forget to update it when you've heard back! REU at CERN (I figure my chances of getting in are even lower if I don't apply!) University of Michigan REU University of Colorado - Boulder REU...

I'm just sending out a general call for people who have an interest in the study of writing systems and some knowledge on the subject. Linguists, anthropologists, sociologists (and even philologists if those still exist) are especially invited to reply. As a pump primer, I read the abstract of...

Greetings to all ! I am 23 years old and I have just graduated this summer with a 8.52/10 ( Greek system - Equivalent to First class according to wikipedia ) and out of fear of getting rusty through searching for a MSc program ( while taking a break after the intensive courses and the TOEFL...

So here's the deal. I LOVE physics. I am positively amazed at what the universe has to offer, and would love to learn LOTS more about it. However, I would like to have a job at some point in the future, preferably one that pays well. I enjoy problem solving and math, so a career as an engineer...

Is there a thread to find study buddies -- people to study and do problems with? Thank-you

1. The problem statement, all variables and given/known Sphere A has a mass=4.2X10^-2 kg and iA tethered to a wall by a thin thread. Excess of electrons for A=1.2X10^12 Excess of electrons for B=3.5X10^12 Distance between A and B=0.23m find the angle between the thread and the wall Homework...

My old thread was getting messy and I realized I needed to go back to square 1 and write up a plan. So here's an outline of the plan: I will add to this thread as I write the helper functions and encounter any problems. Criticism greatly appreciated.

I have taken over a project halfway through (which is never an easy thing), and I need to get a threaded insert to place inside a steel piece that a threaded rod will move through. The original person working on the project wanted to get Acme threading on the inside of the insert and standard...

An introductory picture. Homework Statement Its number in my physics exercise book is 1.147. (just for reference, though completely unimportant). The actual problem description is written below. An airplane is flying from point A to the point B which is 400 km west from the point A...

Charged Particle thread with linear charge force Homework Statement A uniformly charged thread with linear charge density 5 C/m lies along the curve y = (3/m) x^2 for 0≤x7m. The y component of the electric force it exerts on a 6 C point charge located at (3m, 0m, 2m) is given by...

So this is taken from another forum that I frequent. Basically just post any random old thought that you might be feeling. This way you don't have to start a whole new topic just to say "Damn it's cloudy out today". If you guys don't approve of the thread, then by all means please do...

Hi all, I'm having difficulty selecting a fifth course for this upcoming semester. I figured that this would be the best place to get input from people who have already taken similar classes. Currently, I have registered for: Math 472- Dynamical Systems (the emphasis of the course is on...

Homework Statement I have to write a simple program that uses threads to execute a queue of arbitrary tasks. The more threads i make, the better it should perform (theoretically). I have to simulate a thread pool without using any of Java's built in utilities for threads. The...

I don't want to derail the discussion in the WC threads, but after reading these two pages: http://www.anncoulter.com/columns/2014-06-25.html http://www.bbc.com/news/blogs-echochambers-28065500 I think it deserves its own thread. Bunch of thoughts: While I agree soccer can be boring...

I get the theory: Fc = Ft + Fg Uniform circular motion, in the vertical plane. Fc = net force = centripetal force Ft = force of tension in the string Fg = force of gravity so at the top, with vector addition: Ft = Fc- Fg And if we define 'up' as positive, then should the equation look like...

I am by no means a serious, hardcore gamer (I wouldn't have time to be interested in Science if I were, I reckon). But, I do thoroughly enjoy playing videogames in my spare time. Does anyone else around here? I figure maybe some interesting discussions can come out of this, so might as well give...

The "What telescope are you using" thread What telescope and other equipment are you currently using?

Round number post self-congratulation thread! Today, I have reached 12000 registered posts at PF! That is a nice number, and fills me with a warm, fuzzy sense of contentment. What have your feelings been when you reached a nice, round number of posts on PF? Share your experiences here...

Please note this is a very serious thread. Please note Newton's First Law: First law: When viewed in an inertial reference frame, an object either remains at rest or moves at a constant velocity, unless acted upon by an external force. Here is an experiment to prove this First Law...

I am looking for a job, any job. Fortunately, I will be starting graduate school in the fall. I have already graduated with a BSc however and want to make the best of my time until it starts, saving at least some modest amount that'll cover for the eventual travel and first month(s) of living...

I have gathered experimental data regarding this heat transfer problem. Unfortunately right now there is no simple way to measure discharge water temperature. On the theoretical approach developed on post # 10 of abovementioned thread, a water temperature increase of 50 °C was considered...

Hi all, im building a bench vice for college and I need to do a report on It also. the problem I am having is working out the force required to strip the threads off an M10 x 1.5 metric thread. both the thread and nut are to be made from mild steel. any info that I could find online has only...

Homework Statement Two small .1 gram stryofoam balls are strung like beads on a vertical insulating thread. The lower ball is glued to the thread but the upper ball is free to move. Imagine that both are given an equal amount of negative charge such that the upper ball is suspended about the...

These jalapenos I grew this summer are really coming in handy this winter. Even the pickling liquid is extra hot. They're good in just about anything for adding a great pepper taste and a little heat. http://imagizer.imageshack.us/v2/800x600q90/690/2hpo.jpg

We have various topical threads, e.g. The Food Thread, Best Songs Ever, How does your Garden grow?, etc, so I thought a cycling thread would be in order. This past summer, our family invested in some new bicycles for family cycling outings. We've frequented a local railtrail. I have a...

--Eleanor Roosevelt Well she's often given credit for that quote, but what she actually said was, Meh, close enough. Today, I turned wood on a lathe. It was from a stump of a plum tree that was in our yard (just goes to show you that if you're a tree in our yard, you better make...

Anyone interested in them can post here I'll start by posting my specs i5 3570k @4.2GHz Gigabyte GTX 760 Gigabyte Z77X-D3H 4GB DDR3 RAM @1600MHz 1TB HDD 23" 1080p monitor

Odd & Even Functions (was thread "Fourier Series") Homework Statement determine if the functions below are odd even or neither: a) f(x)=x^2+2 b) f(x)=(x^2+2)tan(x^2) c) f(x) = (x^2+2)sin(x)tan(x^2)Homework Equations even - f(x) = f(-x) odd - f(-x)=-f(x) The Attempt at a Solution I've managed...

Not another "How does a transistor amplify" thread I used to think solid state components such as transistors amplified signals. This may be correct, but it most certainly needs elaborating. Transistors themselves do NOT amplify signals. It is my understanding that transistors take an input...

Homework Statement This is not a HW questions but from another thread. https://www.physicsforums.com/showthread.php?p=4495692&posted=1#post4495692 The statement I made was that if z increases for a source, then it is accelerating away. Or, it could that if z is constant then the sources...

Homework Statement Problem A) The brick A has a mass of 2.0kg and the brick B has a mass of 3.0kg. As you can see they are bound together via a dyno and is draged by the constant speed v = 2.5m/s The dynos force never changes, meaning they will always have the force 12 N and 7 N. How...

I was searching through old threads that had not been replied to and I found one by 'japam' from Feb 6, 2005. After solving it, I realized that the thread was closed so I am reposting it now in case 'japam' is still curious :) -------------------------- His question was: Suppose you have two...

I am not sure I get the concept of centrifugal force.. If we have a stone tied to a thread and we just spin it in a circle, and while we are spinning it in a circle, the thread breaks and the stone flies off tangentially. If we watch this motion from an inertial frame, which force will be...

Thanks in advance to any help on this: I am working in a combustion lab and we are designing a high pressure tube reactor. My background is only in math and I have never taken a materials or design course before, so I apologize that this is probably a very basic application and a very...

Homework Statement (Ans: ##\pi F/(2L)##) Homework Equations The Attempt at a Solution I am not too much familiar with these type of questions so I don't really how to begin with this. Also, I don't understand the question here. Do we have to consider it in the vertical or...

http://postimg.org/image/d530nwobf/ those are plasma arcs emitting from the gun no? Ionized air?

It may not have gone unnoticed that I've looked at a paper or two concerning the Younger Dryas oscillation The amount of data and records about large changes in weather patterns is dazzling, confusing and sometimes contradictory, as I demonstrated here Recalling the enigmatic start date...

This thread has two objectives, to enrich the English language wit a lot of new words and "generate traffic" for PF (see this thread.) I start: Decaninetion (noun) To make an area free of dogs. I'm decanineted: my dog has died.

a few things that make me way too angry are snide and rude to people i understand if youre having a bad day but that doesn't give you the right to be mean and people who are close minded and have never givin any thought to other peoples views i can't stand that I am always open for new ideas...