A train brakes from 40 m/s to a stop over a
distance of 100m, what
is the acceleration of
the train?

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.

The ability to make things happen is also called a. heat b. force c. matter d. energy

Which wave is the result of amplification and produces a louder sound