1. The problem statement, all variables and given/known data When gas is burned in a cylinder of an engine it creates a high pressure that pushes a piston. If the pressure is 100psi and it moves a 3 inch in diameter piston a distance of 5cm every .1 seconds. How much horsepower does this action produce? 2. Relevant equations Pressure = Force/ Area HP = Force * distance / time Area of Cylender = 2pieR2 (H) + 2pie R2 Kinetic Energy = 1/2 (mass) (velocity)2 3. The attempt at a solution Im honestly not sure where to start. I can find Force by multiplying Pressure by area, however I can't find the area of a cylinder without it's height. We have only looked at equations for power in the form of Kinetic Energy and Potential Energy, so I assume the problem is solved with the Kinetic Energy equation, however, without mass I do not see how I can solve for kinetic energy. I either need force or mass and I am not sure how I could go about finding either one.