Question: A force F = Ai +0 Bj is applied to a point whose radius vector relative to the origin of coordinates O is equal to

A force F = Ai +0 Bj is applied to a point whose radius vector relative to the origin of coordinates O is equal to r = ai + bj, where a, b, A, B are constants, and i, j are the unit vectors of the x and y axes. Find the moment N and the arm l of the force F relative to the point O.

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