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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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