# Engineering Mechanics - Force System Resultants

Exercise : Force System Resultants - General Questions
• Force System Resultants - General Questions
36. Express the moment of the couple acting on the pipe on Cartesian vector form. What is the magnitude of the couple moment?

Mc = (37.5i-25j) N-m, Mc = 45.1 N-m
Mc = (25i-37.5j) N-m, Mc = 45.1 N-m
Mc =45.1kN-m, Mc = 45.1 N-m
Mc =-45.1kN-m, Mc = 45.1 N-m
Explanation:
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37. Determine the direction (0°   180°) of the 30-lb force F so that the moment of F about point A has the maximum magnitude. = 36.9° = 53.1° = 127.0° = 90.0°
Explanation:
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38. Determine the moment of force F2 about point A on the beam.

M2 = 800 ft-lb M2 = 50 ft-lb M2 = 600 ft-lb M2 = 37.5 ft-lb Explanation:
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39. The distributed loadings of soil pressure on the sides and bottom of a spread footing are shown. Simplify this system to a single resultant force and couple moment acting at A. What is the resultant force F and the couple moment M?

F = (72i + 125j)N, M = 83.5 N-m CCW
F = (144i + 125j)N, M = 135.7 N-m CCW
F = (144i + 125j)N, M = 83.5 N-m CCW
F = (72i + 125j)N, M = 102.1 N-m CCW
Explanation:
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40. Replace the two forces acting on the tree branches by an equivalent force and couple moment acting at point O.

R = (60i+198j-36k) N, M = (747i+18j-924k) N-m
R = (60i+18j-324k) N, M = (747i+18j-924k) N-m
R = (60i+198j-36k) N, M = (360i+1260j-414k) N-m
R = (60i+18j-324k) N, M = (360i+1260j-414k) N-m