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: Moments, finding angle.

  1. Sep 16, 2010 #1
    Hey guys I'm having trouble with this simple statics problem.

    [PLAIN]http://img443.imageshack.us/img443/7218/37statics.png [Broken]

    [PLAIN]http://img841.imageshack.us/img841/6734/372.png [Broken]

    My set up.

    [PLAIN]http://img543.imageshack.us/img543/9349/ya1x.jpg [Broken]

    I'm confused on where I'm supposed to take it from here. The solutions are: 6.12, 33.8 degrees.

    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Sep 16, 2010 #2


    User Avatar
    Homework Helper

    Your final equation is 850=(11cosα)(22) + (11sinα)(8).

    Try expressing (11cosα)(22) + (11sinα)(8) as Rsin(α+θ). So expand out Rsin(α+θ) and equate coefficients. This will allow you to eventually replace '(11cosα)(22) + (11sinα)(8)' with Rsin(α+θ), leaving you with Rsin(α+θ)=850, which you can easily solve.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook