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: Can you check my solution for this trusses problem

  1. Dec 3, 2014 #1

    < Mentor Note -- thread moved to HH from the technical physics forums, so no HH Template is shown >

    I didn't attend the lecture in which the professor explained trusses so I don't really know.
    Am I doing something wrong so far? is the force DE 0? because if go at the point C and calculate CD (750) then go for point D CD + 400 + DE (0) = 0 don't add up
    Last edited by a moderator: Dec 4, 2014
  2. jcsd
  3. Dec 4, 2014 #2
    Look at your moment around B again, you are missing something.

    *hint: See the force of 600N at point C
  4. Dec 4, 2014 #3
    But isn't the 600 N * 0 (perpendicular distance) = 0?
  5. Dec 4, 2014 #4
    No, you are taking a moment around Point B. However there is a force at Point C that you didn't take into account. Force there is 600N, and the distance is 4 meters.
  6. Dec 4, 2014 #5
    oh my bad, the moment in this case is anti clock wise right?
    but is it counted if I take the moment at A ?
  7. Dec 4, 2014 #6
    Yep it is anti-clock wise. No, it is not counted if you take the moment around point A.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted