How to determine the resulting gauge pressure


New member
Apr 20, 2021
the question is: A cylinder of radius 0.15 m and height 0.75 m contains an oil with a density of 838 kg/m^3. The cylinder is sealed on one end by a moveable piston of mass 3.00 kg. An additional mass of 20.0 kg is placed on top of the moveable piston. Determine the resulting gauge pressure of the oil inside. Express your answer in PSI. (1 PSI = 6894.76 Pa)

For this question, the way I thought it was to be solved is incorrect. Could anyone correct me or show me how to correctly answer this question? Thanks in advance!