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Direction of tension

  1. Oct 19, 2015 #1
    1. The problem statement, all variables and given/known data
    Let's say the metal rod is held by a cable and supported by a pin at the bottom, the reaction of thr cable is acted downwards.... Why?

    2. Relevant equations


    3. The attempt at a solution
     

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  2. jcsd
  3. Oct 19, 2015 #2

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    I wonder if the problem statement "should" have said:"Let's say the metal rod is hanging by a cable and pinned at the bottom, the reaction of the cable is downwards..."?? If so, your diagram is all wrong. (by "pinned", I mean bolted into some fixture where it is free to rotate in one plane through 180° (forward parallel to flat horizontal ground -- to straight up (90°) -- to backward parallel to ground).) This is just a guess since imho the problem statement isn't clear enough to answer unambiguously.
     
  4. Oct 19, 2015 #3
    i mean the horizontal metal rod id held by a cable , the cable is supported by the pin on the ground . My question is why the direction of tension of cable is in downward direction ?
     
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