In the figure below, the change in internal energy of a gas that is taken from A to C along the blue path is +870 J. The work done on the gas along the red path ABC is -520 J. (a) How much energy must be added to the system by heat as it goes from A through B to C? (b) If the pressure at point A is five times that of point C, what is the work done on the system in going from C to D? (c) What is the energy exchanged with the surroundings by heat as the gas goes from C to A along the green path?

Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter21: Heat And The First Law Of Thermodynamics
Section: Chapter Questions
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In the figure below, the change in internal energy of a gas that is taken from A to C along the blue path is +870 J. The work done on the gas along the red path ABC is -520 J.

(a) How much energy must be added to the system by heat as it goes from A through B to C?

(b) If the pressure at point A is five times that of point C, what is the work done on the system in going from C to D?

(c) What is the energy exchanged with the surroundings by heat as the gas goes from C to A along the green path?

(d) If the change in internal energy in going from point D to point A is +555 J, how much energy must be added to the system by heat as it goes from point C to point D?

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