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Two full$-$sized $ac-mm$ boords ore noiled to $abc-mm$ board and the resulting beom that is subjected to a vertical shear of $1500N.$ Knowing that the allowable shearing force in each nail is $135N,$ determine the allowable spacing sthat can be used between esch pair of nails. Asume $a=45mm,b=45mm$ and $c=90mm.$

The centroidal moment of inertic, of the cross$-$section, is given as ${10}^{-6}(m^4)$