- #1

- 77

- 0

## Homework Statement

http://session.masteringengineering.com/problemAsset/1127430/5/Probs.2-83_84.jpg

Refer to image for problem.

I have to find the magnitude of the force F3. I'm stuck on where to begin.

## Homework Equations

Don't know.

## The Attempt at a Solution

I've done. cos(y)=sqrt(1-cos^2(60)-cos^2(45))

I got the y angle to be 60. I don't know what that means so if someone could explain that would be great. I just used this because I thought I needed to know that. I then tried to break down each force vector into their components.

F = x, y, z

F1=80(4/5), 0, 80(3/5)

F2=0, 0, -110

F3=?

FR=120cos(60), 120cos(60), 120cos(45)

Thats all I got. I don't know what to do now.