The moment about O due to applied force at B is:
, where rOB is the position vector between B and O and F is the resultant force.
The resultant force is calculated by Certasian vector notation.
We resolve each force into x- and y-components the add the repetitive components by scalar algebra.
The position vector between two points is given by:
We also need to know some general rules for vector cross products.
Determine the couple moment. Use a vector analysis and express the result as a Cartesian vector.
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