Work & Equilibrium of Insulated Box: Why W=0?

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Homework Help Overview

The problem involves an insulated box divided by a piston, with air at different pressures on either side. The scenario raises questions about the work done during the process of reaching equilibrium, specifically why the work is assumed to be zero.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the assumption that the work done (W) is zero, particularly in the context of an isolated system. There is a focus on understanding the implications of the system being insulated and the nature of the piston.

Discussion Status

Some participants have provided insights regarding the nature of work in the context of the entire system versus the individual chambers. There is an ongoing exploration of the definitions and assumptions related to work and equilibrium in this context.

Contextual Notes

The discussion highlights the constraints of the problem, such as the isolation of the system and the specific conditions of the piston being frictionless and thermally conducting.

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Homework Statement



"An insulated box is initially divided by a frictionless, thermally conducting piston. One side of the piston is 1.5(m^3) of air at 400k, 4bar. The other side is 1.5(m^3) of air at 400K,2 bar
The piston is released and equilibrium is attained, with the piston experiencing no change of state"


the solution assumes W=0. why is this?

Homework Equations





The Attempt at a Solution

 
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What solution? You didn't post any solution.
 
dauto said:
What solution? You didn't post any solution.

here
 

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That's the work for the entire system, not the work between the two chambers. Since the entire system is in a isolated box, there is no external work or heat.
 

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