Question

A vertical steel rod is 3 m long and has a radius of 0.1m. It is
supporting a load of 1 × 105 N. What is the stress in the rod?

Answer 1

The stress in the rod

$$\sigma=\frac{F}{A}=\frac{F}{\pi R^2}\\ =\frac{1\times 10^5\:\rm N}{3.14\times (0.1\:\rm m)^2}=3.2\times 10^6\:\rm Pa$$