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Homework Help: Calculate the energy lost to friction

  1. Mar 21, 2010 #1
    1. The problem statement, all variables and given/known data

    http://i43.tinypic.com/i1bq1i.jpg
    I need help with number 9

    2. Relevant equations

    Wnet=change in KE
    Wnc=Change in Energy


    3. The attempt at a solution
    so I'm assuming the energy dissipated means the work done by friction?
    so work of friction is umgcos(15)*d
    d=cos(15)h
    I got that work of friction is -9.8257
    Help?
     
  2. jcsd
  3. Mar 21, 2010 #2
    nvm I figured it out.
    .2*mgcos15*d
    and the d=h/sin15
    :approve:
     
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