1. Not finding help here? Sign up for a free 30min 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!

Staics help please

  1. Feb 20, 2009 #1
    staics help please!!!

    Please help with this problem.. I'm going crazy.

    I have attempted the problem and i think my methods are correct. however some algebra mistake is also there i think.

    im submitting my work on the thread below

    Question: Determine the resultant moment of the two forces about the Oa axis. express the result as a Cartesian vector.

    The picture is attached.
    Note*: its 80lb that's a bit smudged on the right of the attachment.
     

    Attached Files:

    • 2.bmp
      2.bmp
      File size:
      130.7 KB
      Views:
      77
  2. jcsd
  3. Feb 20, 2009 #2
    Re: staics help please!!!

    here is my work

    the book answer is : [26.1i - 15.1j] lb*ft
     

    Attached Files:

    • 333.bmp
      333.bmp
      File size:
      206 KB
      Views:
      76
  4. Feb 21, 2009 #3
    Re: staics help please!!!

    Isn't it the perpendicular component of F1 that creates the torque about the Oa axis? Also the [tex]\hat{k}[/tex] in [tex]\vec{m_1}[/tex] seems to be incorrect anyways.
     
    Last edited: Feb 21, 2009
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook