A few easy conceptual questions

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In summary, the first question asks whether energy is released or absorbed when a gas changes to a liquid. The answer is that energy is released in this process. The second question asks about the direction of the force applied by a yo-yo string in a vertical circle. The string applies an inward force in this scenario. It is important to understand the concept of internal energy for the first question, and the relationship between force and acceleration for the second question.
  • #1
chops369
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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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  • #2
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).
 
  • #3



1. You are correct, energy is released when a gas changes to a liquid. This is known as the process of condensation, where the gas molecules lose energy and come together to form a liquid.

2. The string is actually applying both an inward and outward force on the yo-yo. The inward force is due to the tension in the string keeping the yo-yo in its circular motion, while the outward force is due to the yo-yo's inertia trying to move in a straight line. This combination of forces allows the yo-yo to maintain its circular motion.
 

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