# Truss Analysis

1. Nov 17, 2008

### rikka22

1. The problem statement, all variables and given/known data
Determine the forces in each member of the truss shown. Also find the values for any reactant forces

2. Relevant equations

Fx= 0
Fy= 0

3. The attempt at a solution

I set θ in the corner of J1
tan θ=12/16
θ = tan-1 12/16
θ = 36.87

I set Φ in the corner of J3
tan Φ = 12/9
Φ = tan-1 12/9
Φ = 53.13

This is where I began to falter. I could not figure out how to diagram everything out. If someone could just at least give me a diagram of where things are supposed to go, I can sum up the x and y forces by myself. This is pretty urgent, and I was absent for this class so my only help is messy notes from another student. This isn't in my textbook. Any help will be appreciated.

2. Nov 17, 2008

### chaoseverlasting

You want to resolve the forces. If a force $$F$$ makes an angle $$\theta$$ with the horizontal, the horizontal force is $$F_x=Fcos\theta$$ and the vertical force is $$F_y=Fsin\theta$$.

Give us something to work on and we'll lead you on.