Solve problems F $9\mathrm{.}7$ & F $9\mathrm{.}8(2$ Problems; each must be solved by method $1$ and method $2$ as shown below$)$:

using stress transformation equations

Mohr's circle method

Need $4$ pages $($minimum$)$ with

Clear statement on what is given and what to be determined

Equations

Substitution of values, result with units

Graph using protractor on computer tools

This is a project with Total $200$ points

F$9-7.$ Use Mohr's circle to determine the normal stress and shear stress acting on the inclined plane $AB.$

F$9-8.$ Use Mohr's circle to determine the principal stresses at the point. Also, find the corresponding orientation of the element with respect to the element shown.