What is the period of a 1.00m long pendulum

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

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.

An atom that has gained or lost electrons is called an _