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

Reaction of a solid desk

  1. Dec 9, 2006 #1
    Hi all!

    1. The problem statement, all variables and given/known data
    What I'm trying to figure out is a reaction of a solid desk (don't know if this is the proper term) given this picture:

    http://twoflower.matfyz.cz/inc/eng.gif [Broken]

    I need to compute the reactions A, B and C (they corresponding to points denoted by 'a', 'b' and 'c' on the picture.) The dimensions 'a', 'b' and 'c' are constants and I know them.

    3. The attempt at a solution

    So far I computed the reaction C from this equation:

    \cos 60 * F_3 + C*\sin 30 = 0

    But I cannot figure out, how to compute the reaction B and A, I can't put the right equations together...

    Could someone please point me to the right direction?

    Thank you in advance,
    best regards.
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Dec 9, 2006 #2


    User Avatar
    Homework Helper

    Form an equation of the sum of moments with respect to points a and b.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook