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Newtons laws of motion.

  1. Jul 31, 2011 #1
    1. The problem statement, all variables and given/known data

    fill in the blanks.
    when a bird of weight W sits on a stretched wire, The tension in the wire is__________

    2. Relevant equations

    Force(external)=mass*aceeleration

    3. The attempt at a solution

    tension should approach to infinity
    https://docs.google.com/document/d/1jAxRY0XgAlTG_MBPJJXgmmoBuoqs8og73eew_j0wWmM/edit?hl=en_US [Broken]
     
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Jul 31, 2011 #2

    PeterO

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    Homework Helper

    What is your question / difficulty ?
     
    Last edited by a moderator: May 5, 2017
  4. Jul 31, 2011 #3
    is my answer correct.
    My answer is infinity.
     
  5. Jul 31, 2011 #4

    PeterO

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    Clearly it can't be. IF the wire was able to be exactly horizontal between the poles, the tension would be infinity - meaning the wire will never be completely horizontal: it will sag slightly [even without the bird]
    The fact the wire droops only slightly means the tension is quite large - certainly greater than the weight of the bird.
     
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