A system undergoes a cyclic process. The net work done is:
Correct answer: B. Equal to net heat transfer
- A. Zero
- B. Equal to net heat transfer
- C. Equal to internal energy change
- D. Always positive
Explanation
In a cyclic process, the system returns to its initial state, so ΔU = 0. By the first law (ΔU = Q - W), net work done equals net heat transfer (W = Q).
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About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
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