Finding Forces in Truss Members Using Method of Sections

[J-dizzal]

Homework Statement

Determine the forces in members BC and CG. The forces are positive if in tension, negative if in compression.

Homework Equations

ΣF=0
ΣM=0

The Attempt at a Solution

im not sure what I am doing wrong here, i think it might be my angle θ?
I got 3.66N tension as my answer but its wrong, i just started trusses and not sure what I am doing wrong.

 

[J-dizzal]

Im working on a similar problem and am making the same mistake, maybe CH needs to be found? but i think its a zero force member.

 

[SteamKing]

Homework Statement

Determine the forces in members BC and CG. The forces are positive if in tension, negative if in compression.

Homework Equations

ΣF=0
ΣM=0

The Attempt at a Solution

im not sure what I am doing wrong here, i think it might be my angle θ?
I got 3.66N tension as my answer but its wrong, i just started trusses and not sure what I am doing wrong.

Your calculations appear to state that A_y = F_y = 14 (kN?)

The structure is not loaded symmetrically, so these reactions are incorrect.

 

[J-dizzal]

Your calculations appear to state that A_y = F_y = 14 (kN?)

The structure is not loaded symmetrically, so these reactions are incorrect.

thank you sir.