A structural beam of the cross-section shown is subjected to a bending moment M = -7.5 kip.ft about its Z-axis. Determine (a) the location of N.A. from the bottom of the section, (b) the moment of inertia about N.A., (c) the section modulus for the top and bottom utmost fibers, (d) the magnitude and sign of the bending stress at point K, located 3.32 in. above N.A., (e) the maximum tensile bending stress in the section, and (f) the maximum compressive bending stress in the section.

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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.