Determine the moment of the force about the AB axis

Determine the moment of the force
F = {50i - 40j + 20k} lb about the AB axis. Express the

[chuygamer]

To get the Moment AB as a Cartesian form: You just need to multiply your 4 ft*lb times your unit vector AB or u(AB).

[ljseljestad]

That isn't the final answer, it says express it in Cartesian form.

[LeoLotz]

Moment AB is the projection of Moment CA onto AB.. Therefore the final cartesian vector are obtained by multiplying 4 ft*lb with the unit vector of BA

[dannaalamer]

Hello! Could you tutor me? I need help