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!

About change of internal energy(q41)

  1. Nov 8, 2007 #1
    For this question:
    http://tinyurl.com/3ahesh
    the answer is a.

    May I know how do we come to the conclusion that the net change of internal energy of the gas is zero?
     
  2. jcsd
  3. Nov 8, 2007 #2

    Pythagorean

    User Avatar
    Gold Member

    The energy is introduced into the system when the gas is heated up (but kept at the same volume). This energy is lost when the gas contracts freely at constant pressure and temperature from B to To.

    So the energy is gained through heat (dQ) which raises the pressure, then the energy is converted to work on the system, raising the volume (pdV) but keeping the temperature the same, then the gas freely contracts, losing energy through work. (p(V2-V1)).
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: About change of internal energy(q41)
Loading...