Topic: First law of thermodynamics· Thermodynamics

A thermodynamic system is taken through the cycle abcda. The work done by the gas along the path bc is :

A thermodynamic system is taken through the cycle \(abcda\). The work done by the gas along the path \(bc\) is :

P-V diagram of cycle abcda, 100/300 kPa, 100/400 cm^3

1. \(-60\,J\)

2. zero

3. \(30\,J\)

4. \(-90\,J\)

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Answer: 2. zero

Key idea: Work done by a gas is \(W=\int P\,dV\), so it is zero when the volume does not change.

In the figure, path \(bc\) is vertical: the volume stays at 400 cm\(^3\) while the pressure rises from 100 kPa to 300 kPa. Since \(\Delta V=0\), \(W_{bc}=0\).

Option 2.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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A thermodynamic system is taken through the cycle abcda. The work done by the gas along the path bc is :

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