In a closed system, if the internal energy increases, what can be said about the

In a closed system, if the internal energy increases, what can be said about the heat and work done? (2020)

In a closed system, if the internal energy increases, what can be said about the heat and work done? (2020)

Step 1: Understand what a closed system is. A closed system can exchange energy (in the form of heat or work) but not matter with its surroundings.
Step 2: Know what internal energy means. Internal energy is the total energy contained within the system, including kinetic and potential energy of the particles.
Step 3: Recall the first law of thermodynamics. This law states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system.
Step 4: If the internal energy increases, it means that the change in internal energy is positive.
Step 5: Since the change in internal energy is positive, it can happen in two ways: either heat is added to the system (positive heat) or work is done on the system (positive work).
Step 6: Therefore, if the internal energy increases, it indicates that heat is added to the system and/or work is done on the system.

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