Thread — 373 discussions

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...

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...

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: