Which example best illustrates kinetic energy?

A. A car parked on top a hill
B. A book on top of a book shelf
C. A comet that is flying through space
D. A pencil laying down on a desk

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.

Which type of reaction is shown in this energy diagram ?

Which system of units is used by only a small number of countries in the world, including the u.s.