1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: Crane jib. Concurrent force

  1. May 7, 2012 #1
    im am a first year mech eng student. im so lost on this question. the image is the diagram im trying to solve. i think the compressive stress of the crane boom is what is confusing me. i dont want the answer, just where do i start? Force polygon? math?

    please tell me how you would solve this. thankyou

    jib crane.jpg
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. May 7, 2012 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Is this your first year as a freshmen with no statics under your belt? Or have you already taken the core engineering science and Physics courses? If the latter, sum moments about one of the supports = 0. Each member is a 2-force member...the wire in tension and the jib in compression, with their forces directed axially along the axis of the member. Don't forget sum of Fx = 0 and sum of Fy =0.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook