I don’t understand how this works, please help.

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.

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?

What is the role of the water cycle in maintaining freshwater levels in lake and rivers?