The radius of the pedestal is defined by $r=(0\mathrm{.}5e^{-0\mathrm{.}08y^2})m,$ where $y$ is in meters. The material has a

density of $2\mathrm{.}8M\frac{g}{m^3}.$

Part A

Determine the average normal stress at the support.

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

$=$