This question involves maximum bending moment calculation, maximum stress calculation, graph sketches of tensile & compressive stress
dimensions for cross sections that minimize stress with given values and % reduction of maximum stress with new calculated cross sections.
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static engineering systems for stress and bending moments
As per attachement.
includes; maximum bending moment
maximum stress in a beam
graph sketches for tensil and compressive stresses
dimensions for cross section that minimise stress with given values
percentage reduction of the maximum stresswith new calculated cross section