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A piston/cylinder with cross-sectional area of 0.1 ft2 has a piston mass of 200 lbm resting on the stops, With an outside

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A piston/cylinder with cross-sectional area of 0.1 ft2 has a piston mass of 200 lbm resting on the stops, With an outside atmospheric pressure of 1 atm, what should the water pressure be to lift the piston?

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The force acting down on the piston comes from gravitation and the outside atmospheric pressure acting over the top surface. 

Forcre   balance:

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