Force Vector Directed Along A Line

[camino]

Homework Statement

As shown, the cable OA exerts a force on point O of F = Fx(i) + Fy(j) + Fz(k).
If the cable's length is a, what are the x, y, and z coordinates of A in terms of a, Fx, Fy, Fz.

Homework Equations

The Attempt at a Solution

I am really not sure how to go about this. Please help!

 

[tiny-tim]

Hi camino!

(try using the X₂ tag just above the Reply box )

Hint: you know that a is parallel to (F_x,F_y,F_z)