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Homework Help: Find the tension in the horizontal cable that supports the boom

  1. Nov 23, 2013 #1
    1. The problem statement, all variables and given/known data

    A crane in a marble quarry is mounted on the rock walls of the quarry and is supporting a 2000 kg slab of marble as shown in the figure. The center of mass of the 900 kg boom is located one-third of the way from the pivot end of its 15-m length, as shown.

    Given diagram: http://i38.tinypic.com/oqaltx.jpg

    2. Relevant equations

    a)Find the tension in the horizontal cable that supports the boom.

    3. The attempt at a solution

    net torque will be = 0,

    at CM the torque will be 1/3 of length X 830 * 9.8 X cos50 ..

    but i cant organize it for tension T
  2. jcsd
  3. Nov 23, 2013 #2


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    Staff Emeritus
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    It will be easier to solve this problem by considering the torque about the pivot point of the crane -- at the crane's base.


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