Weight & Tension Helo 2 Tension

  1. 1. The problem statement, all variables and given/known data

    How to find Weight in this problem?
    I am trying to do this statics problem
    but I don't know how to find the weight
    so I can solve for
    Sum Fy = 0
    here is the picture link
    [​IMG]

    2. Relevant equations
    TI
    sum of Fx = 0
    480 cos(30) - 450 = 0
    -34

    T1
    sum of Fy = 0
    480 sin(30) - W = 0
    how do I find the weight to substract it

    3. The attempt at a solution

    I dont know I am like really stuck
     
    Last edited: Jan 27, 2009
  2. jcsd
  3. LowlyPion

    LowlyPion 5,328
    Homework Helper

    Resolve the tensions into their X and Y components.

    The system is static, so the sum of the X forces must equal 0 and sum of the Y as well.

    Be careful. One of the tensions may not be critical to holding up the weight.
     
  4. wht the equation I wrote is not right?
    Sum of the Force in X = 480 cos(30) - 450 = 0
    I get = 415 - 450
    = -34
    Sum of the Force in y = 480 sin (30) - W = 0
    240 -w = 0

    I how do I solve for weight
    the answer is about 259.81 lb
    & there is also for t2


    ΣFx = 0; 480cos(30) − 450 = 0

    ΣFy = 0; 480sin(30) − W = 0

    (F ab2 W2) = Find (FAB W)

    W2 = 240.00 lb
    W= min (W1 W2) = W 240.00 lb
     
  5. LowlyPion

    LowlyPion 5,328
    Homework Helper

    You have 2 tensions to worry about.

    Like the weakest link - that's where it will break right?

    First figure out which is the critical constraint.

    If T1 = 450 max, what does that translate to for the chain that can withstand 480? Will the 450 break if it's 480, or will the 480 break if it's 450?

    Then you are armed with what you need to know, because from your equations, you can see that whatever the T1, the weight it can support is 1/2 T1.
     
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