Can you check my solution for this trusses problem

[Furious]

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

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

 

[theOrange]

Look at your moment around B again, you are missing something.

*hint: See the force of 600N at point C

 

[Furious]

Look at your moment around B again, you are missing something.

*hint: See the force of 600N at point C

But isn't the 600 N * 0 (perpendicular distance) = 0?

 

[theOrange]

But isn't the 600 N * 0 (perpendicular distance) = 0?

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.

 

[Furious]

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.

oh my bad, the moment in this case is anti clock wise right?
but is it counted if I take the moment at A ?

 

[theOrange]

oh my bad, the moment in this case is anti clock wise right?
but is it counted if I take the moment at A ?

Yep it is anti-clock wise. No, it is not counted if you take the moment around point A.