1. The problem statement, all variables and given/known data If the cross-section of the barrel of a pump is 5 square centimeters, the stroke of the piston is 20 centimeters, and the volume of the receiver, in which the air is drawn from, is 1 liter, calculate the ratio of the pressure of the air in the receiver to the original pressure after three strokes of the pump. 2. Relevant equations p=F/A 3. The attempt at a solution Force=m*a = (1 liter)(9.81) = 9.81 Area = (5)(20)=100 p=f/a = 9.81/100=.0981 Is this correct so far? how do calculate the ratio?