A force is a push or a pull. Under the right circumstances, anything can exert a force.

Push a notebook or some other object so that it slides across a table or desktop. What force causes the notebook to start moving? What force causes the notebook to stop moving?

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.

What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34

How do we measure or think of speed in the united states?