Consider a rod of steel having radius of 8 mm and the length of 2 m. If a force of 150 kN stretches it along its lengths , then calculated the stress, percentage strain in the rod if the elongation in length is 7.46 mm.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Calculate the Cross-Sectional Area of the Rod
The formula for the cross-sectional area \( A \) of a circular rod is given by:
\[ A = \pi r^2 \]
where \( r \) is the radius of the rod. Given that the radius \( r = 8 \, \text{mm} = 8 \times 10^{-3} \, \text{m} \), we can calculate the area.
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