$($a$)$ If a couple moment $\backslash ($ M$=6\backslash$mathrm$\{$kN$\}-\backslash$mathrm$\{$m$\}\backslash )$ acts about the neutral axis, determine the bending stress at point $\backslash ($ O $\backslash ).($b$)$ Sketch a $3-$dimensional view of the bending stress distribution over the cross section.

General Submission Guidelines:

Neatness, organization, clear and logical methods, and step$-$by$-$step solutions are required at all times.

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Diagram Requirements:

All lines within diagrams $($excluding curved lines$)$ must be drawn using a straightedge or ruler.

Solution requires one or more free$-$body diagrams.

Solution requires a deflection diagram if applicable

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Calculation and Notation Requirements:

Fundamental formulas must be stated in symbol form before inputting quantities. Quantities must be explicitly input into formulas before stating numerical answers.

Use proper notation as defined in lecture and show all steps of all calculations.

Units must be included at all times, including during intermediate calculations. Every individual quantity must have its own units specified.

Never ignore or drop units.

Do not use $\text{'}$E$\text{'}$ notation for a quantity expressed in scientific notation.

Do not use a rounded number $($such as $3\mathrm{.}14)$ to represent $.$ Express properly using the symbol.

If the units as given in the problem are in the SI system, do not convert to U$.$S$.$ Customary units. If the units are in the U$.$S$.$ Customary system, do not convert to SI units.

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Answer Presentation:

Use three significant figures when reporting final answers.

Report final answers in decimal form or scientific notation $($not as a fraction or irrational number$).$

Place a neat box around each final answer. Do not box intermediate answers.