Member B is subjected to a compressive force of 600 lb. If A and B arc both made of wood a...

Member B is subjected to a compressive force of 600 lb. If A and B arc both made of wood and are 1.5 in. thick, determine to the nearest  in. the smallest dimension a of the support so that the average shear stress along the blue line does not exceed τallow = 50 psi. Neglect friction.