Solve the following problems.

NOTE: This is a multi$-$part question. Once an answer is submitted, you will be unable to return to this part.

A $20-$cm$-$long rod with a diameter of $0\mathrm{.}250$ cm is loaded with a $5000$ N weight. If the diameter decreases to $0\mathrm{.}210$ cm $,$ determine the true stress at this load. $($Round the final answer to four decimal places.$)$

The true stress on the rod when it is loaded with a $5000$ N weight is MPa.