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 question

  1. Aug 12, 2010 #1
    [PLAIN]http://img38.imageshack.us/img38/6997/forces99.jpg [Broken]

    I'm unsure how to go about solving this. There's 4 unknowns. Ax Ay Cx and Cy but isn't there only 2 equations (sum of forces in x and y direction are equal to 0) that can be created in this situation?
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Aug 12, 2010 #2

    vela

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Education Advisor

    The net moment on each strut should be 0 as well.
     
  4. Aug 12, 2010 #3

    radou

    User Avatar
    Homework Helper

    No, there are two unknowns, the forces A and C at the supports. There are two equations. Every one of your "unknowns" must be written in terms of A and C (i.e. their projections onto the x and y-axis).
     
  5. Aug 15, 2010 #4
    I am also stuck on this question. any hints would be much appreciated :)
     
  6. Sep 7, 2010 #5
    Draw the triangle of forces for joint B
     
  7. Sep 8, 2010 #6
    You have two additional equations. One relates Ax and Ay. The other relates Cx and Cy. Can you sketch in the expected directions of the reactions?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook