In order to raise the lamp post from the position shown, the force on the cable must create a counterclockwise moment of 1500 lb*ft about point A. Determine the magnitude of F that must be applied to the cable.
I can find the magnitude of a vector when I know the vector. Not in this problem.
The Attempt at a Solution
I know a fair amount to get started, such as definitions, but I have no idea how to actually do calculations.