Problem 7 The situation presented below refers to a particular day at an altitude above standard sea level. A piston-cylinder device with a cross-sectional area of 0.01 m² is exposed to a local ambient pressure Patm = 96 kPa. Inside the cylinder there is water vapor and the piston of mass equal 150 kg rests on a base ring support. You are asked to draw a free body diagram for the piston and determine the water vapor pressure, in bar, required to lift the piston. Consider that the acceleration of gravity is 9.81 m/s² and neglect the friction between the piston and the cylinder wall. Hint: focus on the reaction of the base ring support on the piston before and after the instant when the piston is lifted by the water pressure. Base ring support for piston = 96 kPa Water

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