In the equilibrium lab, you place the fulcrum (pivot point) at the 25 cm
mark on the meter stick. Then you hang a mass #1 of 75 grams at the 62.5 cm mark, a
mass #2 of 25 grams at the 12.5 cm mark, and a mass #3 at the 0 cm mark. Find the value
of mass #3 in order for the system to be in equilibrium. Show your work with a free body
diagram and algebraic manipulations. Mass of the meter stick is 100 grams.