A vertical piston-cylinder assembly contains 0.5 kg of unidentified substance; take the unidentified substance to be the system. Initially, the piston is resting against the stops when the system pressure and temperature are 4.00 bar and 0°C, respectively. The piston has a mass of 75 kg and face area of 0.184 m2; local atmospheric pressure is 1.01 bar; local gravitational acceleration is 9.81 m/s2. (1) What system pressure would be required to lift the piston from the stops? (2) Thinking about substance 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? (4) How much heat transfer must occur to the system in order to begin to lift the piston from the stops? (5) Once the piston is lifted from the stops, will the system pressure change? Why? (6) Assuming that the system's pressure remains constant, find the work in kJ for the volume to increase by 15% (ie. V2=1.15*V1). Carefully indicate the direction (i.e., what is the work that you reported being done on or by?) (7) Suppose the heat transfer stops, and the substance is allowed to come to an equilibrium temperature with its environment at 25 °C. What phase(s) will the substance be?
A vertical piston-cylinder assembly contains 0.5 kg of unidentified substance; take the unidentified substance to be the system. Initially, the piston is resting against the stops when the system pressure and temperature are 4.00 bar and 0°C, respectively. The piston has a mass of 75 kg and face area of 0.184 m2; local atmospheric pressure is 1.01 bar; local gravitational acceleration is 9.81 m/s2. (1) What system pressure would be required to lift the piston from the stops? (2) Thinking about substance 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? (4) How much heat transfer must occur to the system in order to begin to lift the piston from the stops? (5) Once the piston is lifted from the stops, will the system pressure change? Why? (6) Assuming that the system's pressure remains constant, find the work in kJ for the volume to increase by 15% (ie. V2=1.15*V1). Carefully indicate the direction (i.e., what is the work that you reported being done on or by?) (7) Suppose the heat transfer stops, and the substance is allowed to come to an equilibrium temperature with its environment at 25 °C. What phase(s) will the substance be?
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter1: Heat, Temperature, And Pressure
Section: Chapter Questions
Problem 6RQ: One British thermal unit will raise the temperature of _____ 1b of water _____F.
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Transcribed Image Text:A vertical piston-cylinder assembly contains 0.5 kg of unidentified substance; take the unidentified substance to
be the system. Initially, the piston is resting against the stops when the system pressure and temperature are 4.00
bar and 0°C, respectively. The piston has a mass of 75 kg and face area of 0.184 m2; local atmospheric pressure
is 1.01 bar; local gravitational acceleration is 9.81 m/s2.
(1) What system pressure would be required to lift the piston from the stops?
(2) Thinking about substance 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?
(4) How much heat transfer must occur to the system in order to begin to lift the piston from the stops?
(5) Once the piston is lifted from the stops, will the system pressure change? Why?
(6) Assuming that the system's pressure remains constant, find the work in kJ for the volume to increase by 15%
(i.e. V2=1.15*V1). Carefully indicate the direction (i.e., what is the work that you reported being done on or
by?)
(7) Suppose the heat transfer stops, and the substance is allowed to come to an equilibrium temperature with its
environment at 25 °C. What phase(s) will the substance be?
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