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Pulley question to determine the weight at a certain angle

  1. Apr 11, 2012 #1
    1. The problem statement, all variables and given/known data
    An assembly shown in the picture, GH , HK, HNL are three cables. the mass of box L is 52Kg,
    a) determine the mass of box K in order to make angle theta as 25 degrees



    2. Relevant equations
    Fx=0
    Fy=0


    3. The attempt at a solution
    Fhn x cos(25) = Fhg x cos(0)
    fhn x sin(25) = 52kg
    fhn(sin25 x cos25) =39kg

    doesnt look right to me. steps on how to do it would be great & guidance through it rather than telling me its a static equillibrium question or just over complicating it. thank you for giving it a look
     

    Attached Files:

  2. jcsd
  3. Apr 11, 2012 #2

    PhanthomJay

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    Science Advisor
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    Gold Member

    that's Fxnet =0 and Fynet = 0. Yep!
    yes, good
    hmmm, if you look at the box L of mass = 52 kg, then the tension force in NL is ??? And then HN = NL.
    What's this?

    Once you get HN by looking at the forces acting on L and using Newton 1 to solve forn NL. Now you calculate Fhg from your first equation.

    At joint H, the vert comp of HN must equal the tension in HK, per newton 1 in the y direction, and then look at the forces acting on K to solve for its mass .
    doesnt look right to me. steps on how to do it would be great & guidance through it rather than telling me its a static equillibrium question or just over complicating it. thank you for giving it a look[/QUOTE]
     
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