Member B is subjected to a compressive force of 800 lb. If A and B are both made of wood a...

Member B is subjected to a compressive force of 800 lb. If A and B are both made of wood and are  in. thick, determine to the nearest | in. the smallest dimension h of the horizontal segment so that it does not fail in shear. The average shear stress for the segment is τallow = 300 psi.