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F = 200 N, acting at point A (2, 3, 4) Point O (0, 0, 0)

Calculate the magnitude of the moment.

Calculate the x- and y-components of each force.

MO = rOA × F = |i j k| |2 3 4| |Fx Fy Fz|

Calculate the moment of the force about point O.

by Ferdinand P. Beer, E. Russell Johnston Jr., David F. Mazurek, and Michael E. Plesha is a widely used textbook in engineering mechanics courses. Here's a deep dive into the solutions of this book: