An adult of mass 75.0 kg sits on a see-saw at a playground with a child sitting 2.25 m from the pivot point on the other side from the adult. Calculate where the adult must sit for the see-saw to remain balanced and horizontal.

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 rate of 12 liters of water moving through a water hose in 4.0 minutes?

Select all the correct answers. which three statements about electromagnetic radiation are true?