The beam is constructed from three boards. Determine the maximum loads P that it can support if the allowable shear stress for the wood is Ï„_allow= 400 psi. What is the maximum allowable spacing s of the nails used to hold the top and bottom flanges to the web if each nail can resist a sheer force of 400 lb?

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A -6 ft- 6 ft - -6 ft- 10 in. 1,5 in. 12 in. 1 in. 1.5 in. 6 in.