For an adiabatic contraction:
Correct answer: D. All of these
- A. Temperature increases
- B. Mechanical energy comes into the system
- C. ΔQ = Zero
- D. All of these
Explanation
During an adiabatic contraction, work is done on the system, which is an input of mechanical energy. With no heat allowed to escape (ΔQ=0), this work increases the system's internal energy, which in turn raises its temperature. Therefore, all three statements are correct.
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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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