1. The problem statement, all variables and given/known data Steam moves into the cylinder of a steam engine at a constant pressure and does 0.79 J of work on a piston. The diameter of the piston is 1.7 cm, and the piston travels 2.2 cm in one stroke. What is the pressure of the steam? Answer in units of Pa. 2. Relevant equations w=f*r a=pi*r^2 P=f/a 100 cm= 1m 3. The attempt at a solution 2.2cm=.022m 1.7cm=.017m w=f*r .79=.022*x x=35.9090909091 now find area: a=pi*r^2 1.7=d .85=r pi*.85^2=2.269800692=a p=f/a p=35.9090909091/2.269800692 p=15.82 now this seems to be wrong but I do not understand what I am doing wrong. please help me.