Question

question 5 (4 points)
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when does the law of conservation of energy apply?
in every possible system.
when the system is open, which means there are no outside forces acting on it.
only when there is no mechanical energy in the system.
when the system is closed, which means there are no outside forces acting on it.

Explanation:

The Law of Conservation of Energy states that energy cannot be created or destroyed, only transferred or transformed. It applies to a closed system (a system with no outside forces/energy transfers acting on it). Let's analyze the options:

• "In every possible system" is incorrect because open systems can have energy added/removed.
• "When the system is open..." is wrong as open systems allow external interactions.
• "Only when there is no mechanical energy" is incorrect; the law applies to all forms of energy, including mechanical, and mechanical energy can be present.
• "When the system is closed..." matches the condition for energy conservation (no outside forces/energy exchanges).

Answer:

When the system is closed, which means there are no outside forces acting on it.