Richard feynman Definition and 21 Threads

In section 3.8, Feynman does a derivation of the Lorentz transformation for mass starting from $$\frac{d}{dt}E=F \cdot v \hspace{1cm}(1) $$ But is this a valid starting point if you are going to show mass changes with velocity? He says (1) comes from chapter 13 of his Lectures which he...

Great question answered by Prof Richard Muller with a joke on the one time gravity killed a man...

I was wondering if anyone else had trouble with reading Richard Feynman's lectures on physics. I think he's a good man and had fundamental contributions to science, but has anyone noticed that it is sometimes hard to follow what he is saying? I was reading his chapter about psuedo forces and...

Summary: There is some thing i did not get about Multiple History theory Summary: There is some thing i did not get about Multiple History theory I am reading big answers to the big questions from Stephan Hawking. He has mentioned very little about Multiple History theory. I could not...

Could anyone explain me in simple words what is being said in this topic from this book (great book and author btw)... i don't understand after it starts talking about perpetual motion and lifting and lowering of weights.please explain in simple words. okay someone said to add more details to my...

I'm teaching myself some algebra using Paul's Online Math Notes. I've been doing very well, (I understand the concepts, and I do well on Practice/Assignment Problems) but I would like to know how long it will be until I get to Calculus I? What are the hardest concepts to grasp when learning this...

Was listening to a Charlie Munger interview: At time 1:55, Charlie mentions Feynman used to sleep with wives of his undergraduate students. I never knew about this personal side of him.

My question is on the assumption that there is nothing in laws of nature that says if gravity had time reversal then nothing would appear odd. The example professor Feynman gave was a system with objects rotating due to gravitational attraction that rotated in a clockwise manner with normal...

I am not sure if this is the right part of the forums to post this, but I was reading the book Surely you're joking Mr Feynman when i reached this part: This got me thinking. How does one "understand" physics and mathematics? It's certainly more than remembering some formulas. What do you think?

Greg Bernhardt submitted a new PF Insights post Think You Know Richard Feynman? Continue reading the Original PF Insights Post.

Hi all, I was thinking about the problem and can someone verify my solution : 1) Set up a Magnetic field going from down to up, i.e north pole is at the bottom. 2) Use the triboelectric series to charge some small particle positive (hair or glass with teflon) 3) Throw that particle in forward...

I have the books and audios. But I have yet to find the videos. I am wondering whether they exist.

Hi everyone. I don't know if this is the right place for this thread, but I couldn't find a better one. In one of the Feynman's interviews, he says "So …altogether I can’t believe the special stories that’ve been made up about our relationship to the universe at large because they seem to...

At the beginning...WOW what a huge boost in confidence! "You ask me if an ordinary person studying very hard would get to be able to imagine these things as I imgaine them? Of Course! I was an ordinary person who studied hard." ^.^ <3 I am in loveeeee...

A fitting http://www.ted.com/talks/leonard_susskind_my_friend_richard_feynman.html?utm_source=newsletter_weekly_2011-05-17&utm_campaign=newsletter_weekly&utm_medium=email" by Leonard Susskind who really knew Dick Feynman. Enjoy... Rhody... :biggrin: Left me with a warm fuzzy feeling (no pun...

I wonder... Would it be something like that?

https://www.youtube.com/watch?v=http://www.youtube.com/watch?v=QMRGYkfzgs0

Greetings all, If you are like me you have a profound respect and admiration for Richard Feynman, the father of QED. Rarely does humanity produce such a brilliant mind and with such an affable personality to boot. Below is a link where you will find several Caltech lectures, eBooks and...

Hey everyone, I found an AWSOME site that broadcasts science programs for free over the internet. http://www.vega.org.uk/index.php" If you go to Science Programmes > Vega Science Lectures > Richard Feynman you will find the lectures that he gave at the University of Auckland (New...

Heres a new website dedicated to the hero of all physics geeks: Richard P. Feynman.The site features many Feynman articles like his lectures, anecdotes, jokes, stories etc.. other resources like jokes and daily news feed and others make it a good site to kill time or learn some random stuff...

Good morning, After Feynman formulation's of quantum mechanics, he expressed the propagator in function of path integral by this formula: $G(x,t;x_i,t_i)=\int\int exp{\frac{i}{\hbar}\int_{t_i}^{t}L(x,\dot{x},P)dt'}DxDp$ the question is how we can define the integral measure Dx and Dp? thanks