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Static problem

  1. Aug 25, 2015 #1
    1. The problem statement, all variables and given/known data
    Member BC exerts on Member AC a force P directed along line knowing that P must have a 325 N horizontal component, determine (a) the magnitude of the force P,
    20k90zd.jpg
    2. Relevant equations
    Trig I suppose

    3. The attempt at a solution
    So I'm not sure if this correct

    I found two angles using the lengths of 720 mm and 650 mm (90, 42.1 and 47.9)
    I then used the equation Fx = F*Cos( ) to fin dthe magnitude of P

    325 N = F Cos(47.9) ----> 484.76 N
     
  2. jcsd
  3. Aug 25, 2015 #2
    Looks good to me. Just for ease of clarity, when you list angles either name them as ACB, CAB, CBA, or mention in the order you are writing them down.
     
  4. Aug 26, 2015 #3

    haruspex

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    There is no point in finding the angles from the lengths when all you are going to do with the angles is apply trig functions to them. Just use Pythagoras to find the hypotenuse, then use the ratios of the sides.
     
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