Why does it take a long time for the earth to rotate?

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.

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

To a of 4 x hz is 1. 0. mm nm nm