9-76. The ladder is supported on the rough surface at A and by a smooth wall at B . If a man weighing 150 lb stands upright at C , determine the principal stresses in one of the legs at point D . Each leg is made from a 1-in.-thick board having a rectangular cross section. Assume that the total weight of the man is exerted vertically on the rung at C and is shared equally by each of the ladder's two legs. Neglect the weight of the ladder and the forces developed by the man's arms. | |
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