1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

A few easy conceptual questions

  1. Apr 15, 2009 #1
    1. The problem statement, all variables and given/known data
    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?

    2. Relevant equations
    N/A


    3. 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.
     
  2. jcsd
  3. Apr 15, 2009 #2

    Mapes

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    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).
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook