1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Thermodynamis of air in a basketball

  1. Sep 27, 2009 #1
    1. The problem statement, all variables and given/known data
    A player bounces a basketball on the floor, compressing it to 80.0 % of its original volume. The air (assume it is essentially N_2 gas) inside the ball is originally at a temperature of 20.0 C and a pressure of 2.00 atm. The ball's diameter is 23.9 cm

    Temperature at maximum compression equals 47.4 C

    By how much does the internal energy of the air change between the ball's original state and its maximum compression?

    2. Relevant equations

    3. The attempt at a solution


    but thats not right
  2. jcsd
  3. Sep 27, 2009 #2


    User Avatar
    Homework Helper

    Re: Thermodynamics

    Start with the first law


    now no heat is being added to the system so Q=0

    You're left with ΔU= -W. What is the work done on the ball?
  4. Sep 27, 2009 #3
    Re: Thermodynamics

    that is the same thing i was using
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook