Problem $3-$ expected time: $10$ minutes

The plastic pipe AC has a hollow circular

cross$-$section as shown to the right.

Determine the normal stress $$ on the bar's

cross$-$section at B$,$ and the Factor of Safety

$($FS$)$ if the strength of the material is ${}_{\text{u}\text{l}\text{t}}=5$

MPa $.$ Provide a representation of the stress

on a differential volume of material.

Note: Show FBD and state units for each

number.

Partial solutions: $FS=4\mathrm{.}71$

No need to re$-$draw the problem statement