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Example 2.31A prismatic circular log of weight 20 and radius ris supported in a horizontal position against a vertical wall by two identicalbrackets like the one shown in Fig. 2.67(a). Each bar AB is hinged to the wallat A and supported at B by a horizontal cable BD. Assuming smooth surfacesat all points ofcon tact, find the value of the angle α that AB should make withthe wall to attain a minimum tension S in each cable BD

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