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Pulling a boat (net work)

  1. Sep 28, 2006 #1
    [​IMG]

    The drawing shows a boat being pulled by two locomotives through a canal of length 1.04 km. The tension in each cable is 4.27 x 103 N, and theta = 20.0o. what is the net work done on the boat by the two locomotives?


    Here is what I've done so far:

    Force=4.27*10^3
    delta(r)=1.04
    theta=20

    W=2* [4.27*10^3 (1.04) (cos20) ]

    =8345J

    What am I doing wrong here? thanks
     
  2. jcsd
  3. Sep 28, 2006 #2

    Doc Al

    User Avatar

    Staff: Mentor

    The distance is given in km--convert to meters.
     
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