Which situations contain unbalanced forces? check all that apply. -a book that rests on a table -a book falls to the floor -a car skids to a stop -a duck floats on a pond -a balloon hangs in midair -a foam ball launches from a spring

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 is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

Which of the the following are examples of projectile motion of both projectile motion and two dimensional motion