Recent content by Janko1

Thank you very much for all the help, the things are clearer now and I think I will be able to properly solve the problem.

Yeah, sorry. $$F_d = 1/2 c_p A \rho u^2 $$ is the drag force, and $$F = \dfrac{\rho A u_2 \delta t u_2 - \rho A u_1 \delta t u_1}{\delta t} $$ is the conservation of momentum. So I should just take this shear stress at the upper obstacle boundary or am I missing anything else? I believe that...

So as stated, I am calculating the pressure and drag forces on an obstacle, but have trouble with which velocities to take. This is my geometry: http://shrani.si/f/3l/13P/2Tihb3iM/projekt2.png . I am guessing that I have to take pressure just before the obstacle and just after the obstacle and...

Okay, so inside the inner sphere, I would say that there is no potential, according to the Gauss law. Also if the charge on the outer sphere is +Q and on the inner sphere is -Q, the electric field should be zero, again according to the Gauss law. The charge distribution would change on the outer...

Homework Statement Hi there! So I have found trouble with the following problem. I have a system of two eccentric spheres, where one is inside another. The Attempt at a Solution I have found this answer: https://physics.stackexchange.com/questions/16939/capacitance-of-non-concentric-spheres...