A few easy conceptual questions

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Energy is released when a gas changes to a liquid, as the process involves condensation, which decreases internal energy. In the case of a yo-yo being whirled in a vertical circle, the string exerts an inward force, providing the necessary centripetal force to keep the yo-yo in circular motion. It is important to understand the relationship between internal energy states of different phases of matter and the dynamics of forces acting on objects in motion. Clarifying these concepts strengthens the understanding of the underlying physics principles. Overall, these conceptual questions highlight key aspects of energy transitions and forces in circular motion.
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Homework Statement


Here are a couple of conceptual questions from my cumulative review.

1. Is energy released or absorbed when a gas changes to a liquid?

2. If a yo-yo is being whirled around by its string in a vertical circle, does the string apply an outward force or an inward force?

Homework Equations


N/A


The Attempt at a Solution


I think that energy is released when a gas changes to a liquid, and I believe that the string is applying an inward force.
 
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Looks good to me. To indicate that you didn't just flip a coin to get these, it would be good to say something about the internal energy of a gas vs. a liquid (in the first case) and about force and acceleration (in the second case).
 

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