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How to find he coefficient of kinetic 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.
    _-5299_ J
    (c) Find the coefficient of kinetic friction between the flight bag and the floor.
    ____

    i found part A, by 32.0 x 269 x cos(52.0) = 5299J

    but i dont understand how to get part c

    i keep doing 32Cos(52)=70-32sin(52)k and i get .1357, dont get what im doing wrong HELP!??
     
  2. jcsd
  3. Oct 12, 2011 #2
    What is the matter with the value .1357?
     
  4. Oct 14, 2011 #3
    the answer is .4397
     
  5. Oct 15, 2011 #4

    SammyS

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    What is the normal force the floor exerts on the flight bag?

    Draw a Free Body Diagram.
     
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