If the volume of a thermodynamics system increases, then the work done by the system will be
Correct answer: C. Positive
- A. Zero
- B. Infinite
- C. Positive
- D. Negative
Explanation
In thermodynamics, when a system expands, it performs work on its surroundings. This is because the system exerts force to push against external pressure, leading to an increase in volume. According to the convention used in physics, work done by the system is positive. Thus, when the volume of the system increases, the work done by the system is positive. The option 'zero' is incorrect because it applies when there is no change in volume. The option 'infinite' is incorrect because work done is a finite value determined by the pressure and change in volume. The option 'negative' is incorrect because it would imply work is being done on the system, which corresponds to a decrease in volume.
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About Work
Work is done when a force produces displacement, with its value determined by the component of force along the displacement. The topic covers positive, negative and zero work, work by variable forces from force-displacement graphs, and the connection between net work and change in kinetic energy.
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