Express your answer to three significant figures and include the appropriate units.

The built$-$up shaft shown in $($Figure $1)$ consists of a pipe $AB$ and solid rod $BC.$ The pipe has an inner diameter of $25$ mm and outer diameter of $31\mathrm{.}5$ mm $.$ The rod has a diameter of $13\mathrm{.}0$ mm $.$

Figure

$1$ of $1$

Part B

Determine the magnitude of the average normal stress at point $E.$

Express your answer to three significant figures and include the appropriate units. $$

${}_E=1\mathrm{.}88$

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