Finding moments of a 3D model.

1. The problem statement, all variables and given/known data
(See pic attachment)

2. Relevant equations
Moment/Torque = Force * d (Force arm)

3. The attempt at a solution
I have so far
Mx = Fz * ya
My = Fx * za
Mz = -Fx * ya

How I got these answers is by looking at the cube from the component’s axis and whether or not it produces a torque. I am following what I observed the professor doing but not sure about why or how one knows how to do this. Please help!

with the coordinate system being CCW is (+) and (+) xyz based on the "left-hand rule"

Attached Images
File Type: jpg Q_01.jpg (39.7 KB)

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