Recent content by Jonnyb42

The math shows the theoretical distributions of mass, not necessary to be physically possible for any power of 1/r. So it's really a matter of discussing what actual densities are possible. You also asked to give a physical explanation to a seemingly math confusion, so you may want to specify...

yes

Thanks! I cannot seem to find quantum mechanics or lagrangian mechanics anywhere though?

Does anyone know of any "crash courses" in various physics topics such as classical mechanics, quantum mechanics, theories of relativity, field theories, etc free online? By "crash courses" I mean PDF's for example with good examples, since I learn the quickest with examples. I know it is rather...

wow... thank you. This is just what I thought, and I still heard it as potential.

Schrödinger Equation, "Potential" This is a very simple question, but I am confused. I have seen Potential and Potential Energy interchanged.. yet still referred to as potential. Is the "potential" function in the Schrödinger equation really a potential function or potential energy? (units...

In terms of Kelvins, if the temperature of a sample doubles, does the energy content from heat double as well? Also, if you are passing a current through a sample, what should be the temperature vs current relation be theoretically? i.e. what is f(I) in T = f(I). Thanks,

So if the question is about where on the arm to stand to lower the lift faster, then I agree with you, you apply the same force downward. In fact, standing on the end will give more torque like you said and may squeeze the arm against the vertical part causing more friction and may make it even...

..this isn't a physics homework question.. just a wonder of mine

Relative energy of simple 2 particle system (confused!) Ok so I have a simple question which I feel I should know the answer to: Setup: Two particles of different mass.. say M and m (where M > m) are moving past each other by some constant velocity. If we view the energy of the system from...

Right ok thanks, I lost my mind there a little bit!

He mentioned something about boundary conditions, could you explain to me what you mean? What boundary conditions could make the term vanish?

I'm watching the video series on Quantum Mechanics taught by Leonard Susskind, (from Stanford). On Lecture #3, Dr. Susskind says that integration by parts is: ∫FG' = -∫GF' However from what I know integral by parts to be, there i missing a +FG on the righthand side, or something... since I...

So in my theoretical physics class my professor was reminding us ("reminding") of what "linear" means, such as a linear functions or a linear operator. He said the definition was: 1. f(ax) = a f(x) 2. f(x + y) = f(x) + f(y) Functions or operators are "linear" if they meet the above 2...

thanks very much! jonny