Work Done on Thermodynamic Path ABCA: 5625 J

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SUMMARY

The work done along the thermodynamic path ABCA is calculated to be 5625 J. The discussion emphasizes the importance of understanding the sign of work based on whether it is done by the gas or on the gas. Specifically, when the volume decreases, the work done by the gas is negative, which is crucial for accurate calculations. The area under the curve from point C to A is identified as a trapezoid, which is essential for determining the work done in this segment.

PREREQUISITES
  • Understanding of thermodynamic concepts, specifically work and energy.
  • Familiarity with pressure-volume (P-V) diagrams.
  • Knowledge of geometric calculations for areas, particularly trapezoids.
  • Basic principles of gas behavior under compression and expansion.
NEXT STEPS
  • Study the principles of work in thermodynamics, focusing on the first law of thermodynamics.
  • Learn how to calculate areas under curves in P-V diagrams for various thermodynamic processes.
  • Explore the implications of positive and negative work in gas systems.
  • Investigate different types of thermodynamic paths and their effects on work done.
USEFUL FOR

This discussion is beneficial for students studying thermodynamics, physics educators, and professionals working in fields related to energy systems and gas dynamics.

keemosabi
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Homework Statement


The pressure and volume of a gas are changed along a path ABCA in the figure. The vertical divisions on the graph represent 2.5 multiplied by 105 Pa, and the horizontal divisions represent 1.5 multiplied by 10-3 m3. Determine the work done (including algebraic sign) in each segment of the path.
cj6_p15-10alt.gif



(c) C to A
J

The Attempt at a Solution


Isn't it just the area under the curve from C to A? Area of a trapezoid? 5625 J?
 
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keemosabi said:

The Attempt at a Solution


Isn't it just the area under the curve from C to A? Area of a trapezoid? 5625 J?
Not quite. Is work being done by the gas or on the gas? What does this do to the sign of the area/work?

AM
 
Andrew Mason said:
Not quite. Is work being done by the gas or on the gas? What does this do to the sign of the area/work?

AM
Ahh. I see. Since the volume is decreasing the work done by the gas is negative.

Thank you for the help.
 

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