An engine whose piston moves vertically does more work than an
engine whose prison moves horizontally due to its orientation in a
gravitational field. Two such engines are compared. In each engine,
a 235 g piston is pushed through a total distance of 145 cm against
an external pressure of 1.50 atm. The radius of each piston is
4.418 cm. How much extra work (%) must the engine do whose piston
moves vertically? (acceleration due to gravity is 9.8
m/s^2?2??).