A few easy conceptual questions

[chops369]

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.

 

[Mapes]

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).