A vertical piston-cylinder assembly contains 0.5 kg of water. Initially, the piston is resting against the stops when the water pressure and temperature are 1.00 bar and 100°C, respectively. The piston has a mass of 50 kg and face area of 0.01 m2; local atmospheric pressure is 1.01 bar; local gravitational acceleration is 9.81 m/s2 (5) What water pressure would be required to lift the piston from the stops? (3) Thinking about water as the system, is the system best described as open, closed, or isolated? Why? (3) Are changes in kinetic and potential energy negligible for the system in this case? Why?
A vertical piston-cylinder assembly contains 0.5 kg of water. Initially, the piston is resting against the stops when the water pressure and temperature are 1.00 bar and 100°C, respectively. The piston has a mass of 50 kg and face area of 0.01 m2; local atmospheric pressure is 1.01 bar; local gravitational acceleration is 9.81 m/s2
(5) What water pressure would be required to lift the piston from the stops?
(3) Thinking about water as the system, is the system best described as open, closed, or isolated? Why?
(3) Are changes in kinetic and potential energy negligible for the system in this case? Why?
(5) How much heat transfer must occur to the water in order to begin to lift the piston from the stops?
(2) Once the piston is lifted from the stops, will the water pressure change? Why?
(5) Assuming that the water's pressure remains constant, find the work for the volume to double in kJ. Carefully indicate the direction (i.e., what is the work that you reported being done on or by?)
(2) Suppose the heat transfer stops, and the water is allowed to come to an equilibrium temperature with its environment at 25 °C. What phase(s) will the water be?
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