Recent content by fkf

On the r = a I would guess that we get a negative sign since we're having a unit vector a_r which goes outward from the origin. And since the normal to the surface when r = a is the -a_r I would guess that the negative sign when r = a is correct. But when r = b, the unit vector from P and a_r...

Homework Statement Consider a spherical dielectric shell so that ε = ε_0ε_r for a < r < b and ε = ε_0 for 0 < r < a. If a charge Q is placed at the center of the shell, find a) P for a < r < b b) ρ_pv for a < r b c) ρ_ps at r = a and r = b Homework Equations ρ_pv = -div(P) ρ_ps = P...

Homework Statement A uniform rod of length 1.6 m and mass 20 kg is free to rotate about a frictionless pivot at one end in a vertical plane. The rod is released from rest in the horizontal position. The acceleration of gravity is 9.80 m/s2. Homework Equations What is the resultant...

Since the energy is not a vector, I can't threat the energies as vectors and then calculate a given speed for x and y.

Homework Statement An ice-hockey puck has the weight 0.170 kg. The ice-hockey rink is 30x60 m. If no players are on the ice, what speed does the puck have due to the quantum effects (ground state)? Homework Equations The wave-equation solution to the Schrodinger equation is ψ(x,y) =...

Ok, I will refer to "i" as incident and "r" as reflected. And then "p" as parallel to the incline plane and "s" perpendicular. Since we have that the max and min intensity has a ratio of 4.0, we have max when the Polaroid slit is 0 degrees from the wave inte the p direction, and min when it's...

Homework Statement Unpolarized light falls on an angle of 37.5 ° with a plan glass surface. The reflected light polarization is examined with a Polaroid. The ratio between maximum and minimum intensity from Polaroid when it is rotated around is 4.0. Which is the refractive of index glass...

Oh sorry, of course. Wont happen again. Thank you.

Unpolarized light falls on an angle of 37.5 ° with a plan glass surface. The reflected light polarization is examined with a Polaroid. The ratio between maximum and minimum intensity from Polaroid when it is rotated around is 4.0. Which is the refractive of index glass? I would like to use the...