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Homework Help: What is the work done by friction?

  1. Oct 12, 2011 #1
    A flight attendant pulls her 70.0 N flight bag a distance of 269 m along a level airport floor at a constant speed. The force she exerts is 32.0 N at an angle of 52.0° above the horizontal.


    (a) Find the work she does on the flight bag.


    _5299_J
    (b) Find the work done by the force of friction on the flight bag.


    ____J
    (c) Find the coefficient of kinetic friction between the flight bag and the floor.

    _____


    i found (a) by using W=fdCos, 32.0 x 269 x Cos(25) = 5299 J

    but for part (b) and (c) i cannot understand what formula to use or how to find an answer for that matter
     
  2. jcsd
  3. Oct 12, 2011 #2
    Drawing a FBD and remembering the above quote will lead you to a solution.
     
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