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!

Statics Question involving forces and moments

  1. Sep 29, 2008 #1
    Just figured I'd throw this up here. I was able to solve for the reaction at E when a=2 but when I tried for a=7.5, I wound up with something completely different. I was wondering what I'm not incorporating into the steps to solving this.

    Also, it says determine the reactions at A and E. The page got cut when I scanned it.

    Attached Files:

  2. jcsd
  3. Sep 29, 2008 #2
    This is my work for solving part a) when a=2

    Sum of the Moment about A = 20(2)-16(1.5)+[5.5(sin(30))+2(cos(30)]E


    E= -8/[5.5(sin(30))+2(cos(30)] or 3.57 lbs at a 60 degree angle, which is what the book says.

    Now how come when I plug in 7.5 in a, I can't come up with 21.0 lbs? Suggestions would be appreciated
  4. Sep 30, 2008 #3


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    what happened to the 32 in-lb couple?
    correct answer (specify direction), wrong equation and math.
    maybe you forgot the 32 inch pound couple?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Statics Question involving forces and moments