In a closed system, if the internal energy of the system increases, what can be
Practice Questions
Q1
In a closed system, if the internal energy of the system increases, what can be said about the work done and heat transfer?
Work done is positive, heat is absorbed
Work done is negative, heat is released
Work done is zero, heat is zero
Work done is positive, heat is released
Questions & Step-by-Step Solutions
In a closed system, if the internal energy of the system increases, what can be said about the work done and heat transfer?
Correct Answer: Work is done on the system or heat is absorbed.
Step 1: Understand that a closed system means no matter can enter or leave the system, but energy can be exchanged.
Step 2: Know that internal energy is the total energy contained within the system.
Step 3: Recall the first law of thermodynamics, which states that the change in internal energy (ΔU) is equal to the heat added to the system (Q) minus the work done by the system (W).
Step 4: If the internal energy increases (ΔU > 0), it means that the heat added to the system (Q) is greater than the work done by the system (W).
Step 5: Therefore, either heat is absorbed by the system (Q > 0) or work is done on the system (W < 0).
