Question

1. stress (axial)

σ = \frac{f}{a} (solve for a)
σ = stress
f = axial force
a = cross - sectional area

Explanation:

Step1: Multiply both sides by A

$\sigma\times A=\frac{F}{A}\times A$

Step2: Simplify the right - hand side

$\sigma A = F$

Step3: Divide both sides by $\sigma$

$A=\frac{F}{\sigma}$

Answer:

$A = \frac{F}{\sigma}$