Recent content by Hari Seldon

Hello, thank you for your reply. Yes, I tried to Google it, but I didn't find what I wanted. I expected an approach like, for example, estabilish the generalized coordinates, calculate the kinetic energy and so on. Finally, that is why I wrote here, I tought that maybe I was thinking in a wrong way.

Is that possible to derive the Navier-Stokes equations with Lagrangian and Hamiltonian methods? If yes, how? and if it is not possible, why?

Perfect! So given the following coordinates of the two masses: $$x_{1}=l\sin{\theta}\sin{\varphi}~~~x_{2}=-l\sin{\theta}\sin{\varphi}$$ $$y_{1}=l\sin{\theta}\cos{\varphi}~~~y_{2}=-l\sin{\theta}\cos{\varphi}$$ $$z_{1}=l\cos{\theta}~~~~~z_{2}=l\cos{\theta}$$ We can calculate the derivative of them...

Thank you very much for your help! Yes, I was adding instead then projecting. So the coordinates should be the following? $$ x_{1}=l\sin{\theta}\sin{\varphi}$$ $$ y_{1}=l\cos{\theta}\cos{\varphi}$$ $$ x_{2}=-l\sin{\theta}\sin{\varphi}$$ $$ y_{2}=l\cos{\theta}\cos{\varphi}$$ Do I need also...

I understand that it is a system with two degrees of freedom. And I chose as generalized coordinates the two angles shown in the pic I posted. I am having troubles in finding the kinetic energy of this system, cause the book tells me that the kinetic energy is something different then what I...