If it is not heat, the energy crossing the boundary of a closed system must be work.Group of answer choicesTrueFalse

To answer the question regarding whether the statement "If it is not heat, the energy crossing the boundary of a closed system must be work" is true or false, we should consider the principles of thermodynamics.

Analysis

1. Understanding Closed Systems: A closed system can exchange energy with its surroundings but not matter. Energy can transition into or out of the system in the forms of heat and work.

2. Energy Transfer: The first law of thermodynamics states that the change in internal energy of a closed system is equal to the energy added to the system as heat minus the work done by the system on its surroundings. Therefore, any energy transfer must manifest as either heat or work.

3. Mutual Exclusivity: The statement suggests that if energy crossing the boundary is not heat, then it must be work. This aligns with the fundamental concepts of thermodynamics where any energy exchange with the environment must be accounted for as either heat or work.

Conclusion

Since energy can only be transferred into or out of a closed system through heat or work, not both can occur at the same time. The assertion that energy crossing the boundary must be work if it is not heat is consistent with thermodynamic principles.

Final Answer

True: If it is not heat, the energy crossing the boundary of a closed system must be work.