15- A gas is contained in a vertical, frictionless piston- cylinder device. The piston has a mass of 4 kg and a crosssectional area of 35 cm². A compressed spring above the piston exerts a force of 60 N on the piston. If the atmospheric pressure is 95 kPa, determine the pressure inside the cylinder 60 N Patm = 95 kPa mp= 4 kg A = 35 cm² P = ?
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