A gas is confined in a 1.25 ft diameter cylinder by a piston, which rests a weight. The mass of the piston and weight together is 250 lbm. The local acceleration of gravity is 32.169 ft/s, and atmospheric pressure is 30.12 in Hg. a. What is the force in Ibf exerted on the gas by the atmosphere, the piston and the weight, assuming no friction between the piston and cylinder? b. What is the pressure of the gas in psia? c. If the gas in the cylinder is heated, it expands pushing the piston and weight upward. If the piston and weight are raised 1.7 ft, what is the work done by the gas in ft- Ibf? What is the change in potential energy of the piston and weight?

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