2. A prismatic bar is suspended from the ceiling and loaded only by its own weight. If the unloaded bar has length L, cross-sectional area A, weight density r, and modulus of elasticity E, what is its length when suspended? (20%)

4. An overhanging beam ABC has a guided support at A, a rectangular cross section, and supports an upward uniform load q = P/L over AB and a downward concentrated load P at the free end C (Fig. 3). The span length from A to B is L, and the length of the overhang is L/2. The cross section has width b and height h. Point D is located midway between the supports at a distance d from the top face of the beam. Knowing that the maximum tensile stress (principal stress) at point D is σ1 = 38 MPa, determine the magnitude of the load P. Data for the beam are as follows: L = 1.75 m, b = 50 mm, h = 220 mm, and d = 55 mm. (20%)

2. A prismatic bar is suspended from the ceiling and loaded only by its own weight. If the unloaded bar has length L, cross-sectional area A, weight density r, and modulus of elasticity E, what is its length when suspended? (20%)

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