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Newton law, An object hanged with a robe that has a weight.

  1. Sep 7, 2012 #1
    1. The problem statement, all variables and given/known data
    An object 50kg is hanged with a wire that wights 12,2kg


    2. Relevant equations
    what's the tension in the robe


    3. The attempt at a solution
    W - T = 0
    (50+12,2)* 9,81 = 0
    T = 610.182 N
     
  2. jcsd
  3. Sep 7, 2012 #2

    gneill

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    Staff: Mentor

    Is the mass of the wire all located at the 50kg object end, or is it evenly distributed along the length of the wire? If it is distributed, do you think this might affect the tension with respect to position along the wire?
     
  4. Sep 7, 2012 #3
    It is distributed.
     
  5. Sep 7, 2012 #4

    gneill

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    Staff: Mentor

    Then you'll have to take that into account and develop an expression that yields the tension with respect to position along the wire. Or do you just need the maximum or minimum tensions?
     
  6. Sep 8, 2012 #5
    I' not sure, they just asked what's the tension in the robe.
    I think the tension at both edges of the robe is the same?
     
  7. Sep 8, 2012 #6

    gneill

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    Staff: Mentor

    Presumably by "robe" you mean "rope"? And this rope is really the same as the wire mentioned in the problem statement?

    Consider a rope hanging under gravity from a fixed point. The top of the rope has to hold up the weight of the entire rope below it. The middle of the rope only has to hold up the half of the rope that is below it. The very bottom of the rope has nothing below it, so it does not have to hold up anything. What is the relationship between the magnitudes of the tensions at these three locations?
     
  8. Sep 8, 2012 #7
    Tension in string is constant if rope is massless

    But here the mass is distributed so tension is different at different points of rope

    at which point do u exactly need tension??
     
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