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Tension, Angles, Forces Problem!

  1. Sep 14, 2011 #1
    1. The problem statement, all variables and given/known data
    Two crewmen pull a boat through a lock, as shown in Figure 5-25. One crewman pulls with a force of F1 = 115 N at an angle of θ = 36° relative to the forward direction of the raft. The second crewman, on the opposite side of the lock, pulls at an angle of 45°. With what force F2 should the second crewman pull so that the net force of the two crewmen is in the forward direction?

    05-22alt.gif


    2. Relevant equations
    All Forces Equations.


    3. The attempt at a solution
    1499khy.jpg
     
  2. jcsd
  3. Sep 14, 2011 #2

    PeterO

    User Avatar
    Homework Helper

    For the net force to be along the canal, the components of force across the river have to be equal.
    You were using cos function which would relate to components along the canal.
     
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