Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Statics Problem, tension in crane

  1. May 13, 2010 #1
    1. The problem statement, all variables and given/known data

    The horizontal member ABC of the rig shown below weighs 1000 lbs and is supported by a pin B and cable EADC. Since the cable passes over pulleys at A and D, the tension is the same along the entire length of the cable. If the rig lifts 3000 lbs at a distance 12 feet from the vertical member DF, determine
    a) the tension in the cable, and
    b) the horizontal and vertical components of the reaction at B.

    2. Relevant equations

    3. The attempt at a solution

    I know you have to use the sum of the moments in both x and y directions = 0 because it is in equilibrium, but im not sure where to go from there
  2. jcsd
  3. May 14, 2010 #2


    User Avatar
    Homework Helper

    Might help to post the picture. The two rules of statics are:

    1. Sum of moments about any point must be zero

    2. Sum of all forces in any direction must be zero (normally it's convenient to use coordinate directions)
  4. May 14, 2010 #3
    Heres a photo, sorry about that

    Attached Files:

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook