4. A vertical wood post 2.5m high must support a lateral load P =12 kN at its upper end (Fig.4). What is the minimum required diameter d1 of the post if the allowable bending stress in the wood is 15 MPa? (20%)

5. A small dam of height h = 2.0m is constructed of vertical wood beams AB of thickness t = 120mm, as shown in the Fig.5. Consider the beams to be simply supported at the top and bottom. Determine the maximum bending stress σmax in the beams, assuming that the weight density of water is γ = 9.81 kN/m3. (20%)

4. A vertical wood post 2.5m high must support a lateral load P =12 kN at its upper end (Fig.4). What is the minimum required diameter d1 of the post if the allowable bending stress in the wood is 15 MPa? (20%)

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