A center-point bending test was performed on a 2 * 4 wood lumberaccording to ASTM D198 procedure with a span of 4 ft and the 4 in. sideis positioned vertically. If the maximum load was 240 kips and the corre-sponding deflection at the mid-span was 2.4 in., calculate the modulus ofrupture and the apparent modulus of elasticity. See Experiment No. 30 forequations.

Required information A composite beam is made by attaching the timber and steel portions shown with bolts of 12-mm diameter spaced longitudinally every 200 mm. The modulus of elasticity is 10 GPa for the wood and 200 GPa for the steel. The vertical shear is 4.4 kN. 12 mm 250 mm 12 mm 150 mm- Determine the average shearing stress in the bolts. (Round the final answers to two decimal places.) The average shearing stress in the bolts is MPa.

What is the reference shear stress for Alaska Yellow Cedar No. 3 dimension lumber?Fv=_______ psi