How do waves change as they approach the shore? apex?

In what direction does the medium move relative to the direction of the wave? explain.

Determine el momento angular de un rueda de 3000g moviendose a 10m/s con un radio de giro de 400cm

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.