(adsbygoogle = window.adsbygoogle || []).push({}); Im so lost in Statics :( :( HELP!

first of all i need to say that i do not go to a school that is known for its sciences. this of course means that we have crappy science teachers because our budget is very low. my teacher is horrible at explaining the material and whenever i ask him a question he does not explain the solution even remotely clear. ive tried the book but its pretty useless too (2 examples per 30-40 problems). the tutors on campus can pretty much only help with general physics so i guess this is my last hope.

1. The problem statement, all variables and given/known data

we are working on truss assemblys and i cant understand how this whole force moment thing works. the solutions that i calculate dont make sense when i try to visualize the situation.

here is one of my homework problems that i have been stuck on for a while now:

2. Relevant equations

where do i begin the calculations?

when calculating the Fy forces should i include point E or just use one at a time (D & E)?

do i need to take the moment about some point? (i tried C and D, but both didnt seem right)

can someone PLEASE give me a clear and precise explaination on how to solve problems like this?

3. The attempt at a solution

this is all i have so far and i doubt its correct:

but this just doesnt make sense for D...Code (Text):SUM Fx=0....Dx=0

SUM Md=0....4kN(6m) + 2kN(4m) - A(6m)=0

A= 5.333kN

SUM Fy=0....5.333kN - 4kN - 2kN + D = 0

D= 0.667kN

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# Homework Help: Im so lost in Statics HELP!

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