Thread Definition and 548 Threads

With all the brains about. I know most of you drink to your misery. Ignorance is bliss eh?

this has probably been done before, but I love talking about dreams! everyone has all sorts of cool dreams, and for some reason it's not something that people talk about nearly enough! my friends always want to hear my dreams (I have really really weird dreams), but then they never return the...

what did you do today? (a corollary to the thread "What do you physicists do?") I thought it might be interesting to take a sociological approach to the question raised by Pivoxa in this thread - https://www.physicsforums.com/showthread.php?t=186911 So what do physicists actually do on a...

No thread yet on the NFL? Between two channels, three game winning field goals in less than two minutes. Denver-Buffalo was first and best. They made a first down and could have spiked the ball to stop the clock. Instead, they rush the field goal team out with about 10 seconds on the...

(Separated from another thread) Hey i need some help finding the general solution of ydy= (-x+ √(x^2 + y^2))dx by using the substitution y= vx and then the substitution u^2= 1 + v^2 It would be great if someone could help.

Hi there, I'm sorry if this sounds incredibly vague, but I'm having difficulties narrowing down the research question for my Physics EE. I'm sure of the field I want to do it in: acoustics. The problem with most experiments involving applied acoustics (ideal room sound, etc.) is that, unless...

Shear thread formula? my group has been told to figure the shear stress of a thread for a hydraulic press which pushes at 100t, we have figured it will pull at 30t using the ratio of the areas from the pistions. just we need to figure the shear stress on the thread if it was to pull. we don't...

Well we have a food thread, a gardening thread, a wildlife photos thread, a best music/tunes thread, . . . sooooo :biggrin: Why not a practical DIY = do it yourself thread for sharing tips and info on home repairs and renovation. My home has a drainage problem. In a relatively dry area...

the Cosmic Variance blog has changed format and eliminated a nice feature that used to keep discussion threads alive. on the righthand margin of front page, it used to list which posts had recent comments and, in small font, WHO THE COMMENTERS WERE so if some interesting people, such as Lee...

ok well what happened to my thread i just requested sum help is dat to much to ask sorry for bothering u guys i just needed sum help thanks for nutin yeh i waited to the last minute but no ones perfect thanks for letting me fail and not even giving a beep

I need a 3/8-16 full thread (Tap) 1/2" long hex bolt with a left hand thread. Anyone know where I can get one without paying a minimum order fee.

hi every1, I am looking for a world title for a thread with most views and replies ever since the internet came into being.

Hello all, I also have a calculus thread in the appropriate forum- I wanted to have a separate physics thread in order to make things a little tidier around here! A quickie: A 1,200kg car turns a corner at 8ms^-1 and travels along the arc of a circle radius 9m in the process. How large...

looks like a cartoon bomb? one more thing what's with the additional rectangle icon on the right hand side?

Instead of cluttering the forum with all my cries for help, I decided to condense them all into one! First, I know this is basic, but I just can't seem to figure it out: Int (x^2+1)/x^2 dx Intx^2/x^2dx+Int1/x^2dx x^3/x^3+x/(x^3/3) ?? Thanks in advance!

Hi. I recently got a Toshiba M7, and been playing with it for some months now. What I've found is that the hardware is neraly there (calibration is my biggest complaint), but the software is really lacking. Currently I'm using Windows journal because OneNote 2007 is fu**ing slow. Anyone...

I need with a problem...A 0.10 kilogram solid rubber ball is attached to the end of an 0.0 meter length of light thread. The ball is swung in a vertical circle. point P, the lowest point of the circle, is 0.20 meter above the floor. The speed of the ball at the top of the circle is 6.0 meters...

The "I wouldn't eat that on a bet" thread. Inspired by Evo's recent purchase of a "food" product made with a lot of water and that may or may not actually contain ham, and her adventures with "jerky" made from a meat paste seasoned with pre-packaged spices (and God knows what else), I am...

Hi, I notice that there are many self-study students here on PF so I thought it'd be a good idea to make a quick reference of great books. Please add on as I'm currently only at the precalculus level. These books should assume relatively little to no prerequisite knowledge, explain concepts...

Hi -- Does anyone have torque recommendations for a 3/4-14 NPSM thread for S.S. and Aluminum? Thanks! Eric

i got some math jokes on my cmoputer. Some are alright, most are terrible. Ill keep adding some periodically. Feel free to post your own. Whats purple and commutes? An abelian grape. (i have no idea what that one means) Q: What do you get if you divide the cirucmference of a...

Cant someone start a tutorial thread? Cant someone start like a tutorial thread? :confused: Looking at the potential here :bugeye: , if we could start a tutorial on a topic, maybe under a separate subdivision, and post there (not problems but different concepts that each one could bring out)...

Here, I have a question. 2 persons are holding a rope of negligible weight tightly at its ends so that it is horizontal. A 30 kg weight is attached to the rope at the mid-point which now no longer remains horizontal. What is the minimum tension required to completely straighten the rope...

So, I have a question about latex, but the thread in the tutorial section is locked. Is there another place I should post it? Anyway, the question is, is there a nice way to do commutative diagrams with latex? I'm talking about those pictures with sets and arrows between them representing...

Everyone has those little niggles that really p you off, spelling nazzis, people who listen to I-pods on trains at a volume whereby everyone can hear the music, the lyrics and anything else, I don't like hardcore dance at the best of times, but at 7 in the morning, I really could do without out...

Since there are only 20 minutes until 2007 in my time zone, I'll report back from 2007 to everyone who isn't sharing the same time zone and say what's it like in 2007. Any questions about the changes in the world shall be answered. :biggrin:

I just hought about it, and why is there not a correct definition of light? Some says they are particles, others say they are waves. Some say they are energy "packages"... If they are waves, they need something to travel through, as i understood as the elecromagnetic field that is...

time to kick off a game of smurfball here...post your randoms as per the uge! :smile:

i need to compute lim (a^n-b^n)^(1/n) when a>b>0. lim ((3n)!/((2^3n)n!(2n!)))^(1/n) where i need to use the lemma that: if an>0 for every n, and lim(x_n+1/x_n)=L then lim x_n^(1/n)=L, how to use it here? for the first i used practically everything i know, the formual for a^n-b^n, and the...

Im trying to figure out this problem, but I am not sure if I have the equation(s) I need. "A ball is thrown horizontally out the window of a building with a velocity of 8.0 m/s from a height of 2500 m. How far from the base of the building will the ball land?" a) 54 m b) 60 m c) 90 m...

Another one of those annoying best "text" threads...If you would kindly have the patience to tell me about your experiences, that would just be dandy. Best Quantum Text: Shankar or Sakurai? Best Linear Algebra Text: Axler or Friedberg? Best Real Analysis Text: Rudin or Royden? Best...

Ok sorry about that, here is the actual problem: g(x)=sq.rt.(2-x) Find the inverse of g(x) ok the answer is -x^2+2, but how come the domain is [0,infinity)??

Inspired by Zz's regifting thread, I would like to ask: What would be the typical mathoms of our time? :smile:

That's right folks, college football season has finally arrived. So declare your allegiance, talk some trash, and gang up on any USC or Ohio State fans. Are there any Notre Dame fans out there? It's ok if you're afraid to come forward because you know your team is overrated and is going to...

Wait a minute... A thread in GD locked for being pointless? Uh oh... No thread is safe! :eek: :eek: Sorry. I just thought it was really funny. :smile: :smile: That said, I don't think a meeting of local realists would fill a phone booth, given the strong blows to that...

I'm sorry I've looked everywhere. Normal search & google search. I guess I should have bookmarked it. Anyone know what I'm talking about?

Since many of us have personal interest in tropical weather, including myself, I thought it might be helpful to have a thread to keep up with it before it happens. Especially since this season is forecasted to be "very active" (NOAA) in the N. Atlantic. :frown: I think my main objective with...

There was a thread where the thread starter pointed out a video lecture where a MIT prof claimed that KVL was incorrectly used in the analysis of self inductive circuits in almost all textbooks. I thought it was an interesting read and wanted more opinions on the idea, however I cannot find the...

So that we do not disturb the Freidel et al thread, I will start another based on Careful's remarks: First comment: if you had made any effort whatsoever to look at category theory over the last few months you would realize that the assumption that it "isn't deep enough" might be a little...

Where the hell did my thread go? https://www.physicsforums.com/showthread.php?p=1025395#post1025395 Here it is again: About the theory put forth by Planck (Planck's constant) that everything is determined and measurable...even human nature (if we had enough data...like asimov touched on...

Kea had a good idea in the MIP forecast poll thread. https://www.physicsforums.com/showthread.php?t=124951 Out of innate gallantry o:) and a desire to make myself useful, I should like to start this thread, which I hope other people will be able to make something out of. The paper in...

This isn't directly a request for homework help, since classes won't be starting for another two months, but I suppose it will be helpful to homework because I'll be taking Applied Analysis, Mechanics, and Electromagnetism, all of which include vector calculus. Given time, I will try to work...

Calling all food lovers and connoisseurs of PF . A thread to post anything and everything about food. Share your favourite recipes, your kind of cuisine and favourite dishes, dining experiences, or even your kitchen antics and fiascos. Let the food fest begin and remember, gluttony is not a...

The Crother's thread obviously needs a new home, as the OP of this thread doesn't want it hijacked to discuss Crother's issues. I'm not sure how much longer the discussion is gonig to go on, but as a courtesy to the OP, I'll just move further discussion here, to avoid hijacking his thread...

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I missed it! :cry: :cry: :cry: :cry: :cry: :cry: Which one carries the honor at the moment?

The "I loathe football" thread. This will be a gathering place for all of us who hate football. Post your snide comments, sarcasms or just express your anguish that otherwise intelligent and well-balanced individuals are now totally f***ed up. :smile: :smile:

Where is the 'So you want to be a physicist?' thread ? I can't find it for the life of me (as a side note, the search function is pretty bad).

The "Quark" thread The "Quark" thread seemed to have been indiscriminately locked (I appreciate a last post to say why). I still have question about quarks. From what marlon and arivero said, it sounds like quarks have not been "seen." Is this so? Why does the color force and strong force...

Congratulations yomamma! https://www.physicsforums.com/showthread.php?t=63689&page=704