Part A

Determine the minimum dimension $b$ to the nearest mm of the beam's cross section to safely support the load. The wood has an allowable normal stress of ${}_{\text{a}\text{l}\text{l}\text{o}\text{w}}=11\mathrm{.}8$ MPa and an allowable shear stress of

${}_{\text{a}\text{l}\text{l}\text{o}\text{w}}=1\mathrm{.}5$MPa.

$($Figure $1)$

Express your answer as an integer.

$b=$

$mm$