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Tension in string - hanging block

  1. Mar 4, 2013 #1

    tony873004

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    Science Advisor
    Gold Member

    1. The problem statement, all variables and given/known data
    Find the tension in string 1
    hangingmass.GIF
    I don't get the same answer as the solution manual.

    My attempt:
    The y-component of string 2’s tension must equal the weight of the block.
    The x-component of string 2’s tension must equal the tension of string 1.
    T1=T2x=T2y/tanθ =23°

    solution manual says 34 N.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 4, 2013 #2

    Doc Al

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    Staff: Mentor

    Good.
    Not sure what you did here (better to write the equations step by step), but I think you found that the tension in string 1 is about 23 N (not degrees!). Sounds right to me.

    I'd say that was wrong.
     
  4. Mar 4, 2013 #3

    tony873004

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    Science Advisor
    Gold Member

    tanθ=opposite/adjacent
    tanθ=T2y/T2x
    tanθ=mg/T2x
    T2x=T1=mg/tanθ = 23 N (oops,not degrees!)

    Thanks Doc Al! Just wanted to make sure I wasn't crazy!
     
  5. Mar 4, 2013 #4

    Doc Al

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    Staff: Mentor

    Much better.

    You are welcome.
     
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