Statics question: Trusses

Question

Statics question:   Trusses

anonymous · Answer

Problem 6-48.  I can't figure out how the moment about point E was calculated.  This is for "method of sections."  I know there's solutions manuals out there for doing this, but I can't see how they got their answer.  I am wondering if someone can try to solve 6-48 without looking at the answer?

anonymous · Answer

the solution will be pretty long lol

anonymous · Answer

That's okay, I figured it out.  My dad (who got his engineering degree a long looong time ago) verified with me that there was a cosine instead of sine in the solution.  And they got a length wrong for one of the moments.  This is method of sections, so it's not as long of a process as using method of joints :-)