Recent content by bremvil

Does anyone have an idea?

A bump to show that I am still interested in the topic. Hopefully someone with more knowledge about this topic than me can give me a hint :)

Hello, I'm trying to solve the following problem: \nabla^2 p = 0 \frac{\partial p}{\partial y}(x, y_{bot}) = \frac{\partial p}{\partial y}(x, y_{top}) = 0 \frac{\partial p}{\partial x}(x_{left}, y) = \frac{\partial p}{\partial x}(x_{right}, y) = C_0 which is the laplace equation...

I finally see it! Thanks a lot.

So basically you are saying that the term on the top right: \frac{\partial \theta^i}{\partial x^m}\frac{\partial x^m}{\partial \theta^j} = \frac{\partial \theta^i}{\partial x^1}\frac{\partial x^1}{\partial \theta^j} + \frac{\partial \theta^i}{\partial x^2}\frac{\partial x^2}{\partial...

Dear Fredrik, Thanks for your reply. I read through it carefully but I find it quite difficult, my math background is not as strong as yours. So I'm still not really there yet. In your explanation you started with: (f\circ g)_{,i}(x)=f_{,j}(g(x)) g^j{}_{,i}(x) but this step is...

Hi everyone, I recently started a course on continuum mechanics. It started with the mathematical background of transforming tensors with contravariant and/or covariant indices. There is one thing I don't understand and it should be really straight forward. I hope you can give me a hint...

Thanks for the help! It's much clearer for me now.

Thanks :)! That clears it up for me. It would be nice if (introductory) physics books were more focusing on these details. Now it caused unnecessary confusion.

Hi everyone, Recently i started a self-study in classical physics by reading through some books. In the section that described Newton's first law I stumbled upon something that did not make much sense. The following section of text got me confused. "If the net force acting on a body is...