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Homework Help: Force and Equilibrium!

  1. May 16, 2009 #1
    1. The problem statement, all variables and given/known data
    1. Two Forces of 692 N and 423 N acts at a point. The resultant force is 786 N. Find the angle between the Forces.[SOLVED]

    2. Three forces acting at a point are in equilibrium. The forces are 980 lbs, 760 lbs and 1220 lbs. Find the angle between the forces (to the nearest minute)

    2. Relevant equations

    3. The attempt at a solution

    1. I tried the Law of cosines and I got 91.96 [SOLVED....I had law of cosines wrong, instead of 2abCosX i had a 4]
    [Answer: 93.92]

    2. No idea how to draw it out, or solve. How do you define minutes in relation to degrees? [Answer: 91.92, 141.49 , 126.6]
  2. jcsd
  3. May 16, 2009 #2
    sorry to tell u..the first one i cannot get the answer u had given... i just get 86.08...far away from your answer...i same with u use the formula...but i finally cannot get the answer..can u tell me...
  4. May 16, 2009 #3
    Well, right now I'm in Calculus, Physics C AP next year haha. From last year though, I remember you always have to do the biggest side sooo.....7862=6922+4232-2(423)(692)(cosX)
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