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Homework Help: Force along a line (Statics)

  1. Sep 25, 2008 #1

    I have been having trouble with this seemingly easy problem. You would think that it is just as simple as finding Fcos(tan-1(3/4)), which yields the answer 320 N. However, as seen in the image, the actual answer is 420 N.

    I would appreciate any help.

  2. jcsd
  3. Sep 26, 2008 #2


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    You've calculated the x component of the given force. That's not what the problem is asking. You need to calculate the x and y components of the forces AB and CD, then set the sum of those x or y components equal to the x or y components, respectively, of the given force.
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