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Thread: Cable and Pillars Problem

  1. #1
    Expert Member
    Join Date
    May 2009
    Answers
    1,374

    Smile Cable and Pillars Problem

    Hi guys,


    An electricity cable, 16 meters in length, hangs between two pillars that are both 15 meters high.

    The ends of the cable are attached to the tops of the pillars.

    At its lowest point, the cable hangs 7 meters above the ground.



    Then..............

    How far the two pillars apart ?????

    Try........

    Best of Luck.........


  2. #2
    Contributing Member
    Join Date
    Sep 2006
    Answers
    962

    Re: Tricky problem..........

    pillar height = 15 meters

    cable length = 16 meters

    lowest point = 7 meters from ground

    The sentence "The ends of the cable are attached to the tops of the pillars" is important here.

    pillar height - lowest point = 15 - 7 = 8 meters

    so up and down it should need 8 * 2 = 16 meters

    so the distance between two pillars = cable length - 16 meters = 0 meters.

    So Both pillar stand next to each other...

    Suresh

  3. #3
    Expert Member
    Join Date
    May 2009
    Answers
    1,374

    Re: Tricky problem..........

    Hi friend,

    The distance b/w the 2 pillars is 0.

    Actually it's a tricky question.

    Congrats & keep it up.

    Regards,
    Riju.


  4. #4
    Junior Member
    Join Date
    May 2009
    Answers
    2

    Re: Cable and Pillars Problem

    shldnt it involve calculation of length of a major axis of ellipse .
    sqrt((a+b)^2-f^2)


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