Question 3: Moment of a force (a) (b) For the system shown below, determine the resultant moment about point O. Information given: 7₁ = (-3î + 4) + 5k) m, 7₂ = (5î − 6ĵ + 4k) m, F₁ 45ĵ+45k) N, and F₂ = (50-55) + 60k) N = Sketch the resultant moment in the right-handed coordinate system shown below. Your sketch should include the sense of direction and sense of rotation of the resultant moment. + X 72 +z (-30î + J 71 Fy

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Laws of Equilibrium

A body is said to be in equilibrium if the system of forces acting on the body tends to keep the body at rest, in other words, there is no translation motion or net torque on the body. Under such conditions, the equilibrium conditions are to be applied to analyze the condition. The branch of mechanics that deals with this condition is known as 'statics'. Under equilibrium, there are no net forces on the body.