Chapter 1, Problem 1.45PP

One measure of a baseball pitcher's performance is earned run average or ERA. It is the average number of earned runs allowed if all the innings pitched were converted to equivalent nine-inning games Therefore, the units for ERA are runs per game,

1.45 Compute the pressure produced in the oil in a closed cylinder by a piston exerting a force of $12.0$ kN on the enclosed oil. The piston has a diameter of $75$ mm.