(Solved): moment in Cartesian (vector) form. (Hint: the 90lb-ft applied couple is a "free" vector and may be ...

moment in Cartesian (vector) form. (Hint: the $90\mathrm{lb}$-ft applied couple is a "free" vector and may be moved to any location without affecting the external response of the pipe. Bottom line: just apply it (as is) to point "O"). Problem 7: Consider the pipe structure projecting from the wall at point "A". Find the resultant force and couple moment acting at point "A". Express the resultant force and couple moment in Cartesian (vector) form. (Hint: the 1,000 lb force needs to be expressed as a vector and the "dimension box" provides the information necessary to define the unit vector in the direction of F. This is a 3-D