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Tension Problem (Two strings and an object)

  1. Oct 26, 2014 #1

    AY3

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    1. A hemispherical sign in 1m diameter and of mass equal to 50kg is supported by two strings. Calculate the tension in the strings.

    2mgtjyu.jpg

    2. W = mg


    3. I tried to solve it but the only thing I was able to do is knowing the distance between the two strings which is 0.75m, I'm new to physics.
     
  2. jcsd
  3. Oct 26, 2014 #2

    NascentOxygen

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    Staff: Mentor

    Hi AY3. http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif [Broken]

    Identify a point about which you can take moments.
     
    Last edited by a moderator: May 7, 2017
  4. Oct 26, 2014 #3

    AY3

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    Do I create an X and Y axes and then do the sin and cos with an angle of 90 degrees?
     
  5. Oct 26, 2014 #4

    NascentOxygen

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    Staff: Mentor

    Placing an x and a y axis on the diagram would be a good first step.

    It doesn't matter exactly where you locate them.
     
    Last edited: Oct 26, 2014
  6. Oct 26, 2014 #5

    AY3

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    I solved it, the first step was creating an equation for the summition of force. I called the strings T2 and T2, the equation is T1+T2-W=0 because the object is in equilibrium. I have two unknowns in the equation. So the next step is determining the torque, assuming the point of rotation is T2.
    Its equation was (T1*0.75)–(W*0.25)=0
    In the end T1=166.67n and by substituting in the first equation T2=333.33n
     
  7. Oct 26, 2014 #6

    AY3

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    I meant T1 and T2.
     
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