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485_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

485_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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Solution 5.12-5 Palm tree F REE - BODY DIAGRAM S p d 3 32 269.39 in. 3 A p d 2 4 153.94 in. 2 d 14 in. L 2 30 ft 360 in. L 1 12 ft 144 in. P 2 100 lb P 1 900 lb M AXIMUM TENSILE STRESS M AXIMUM COMPRESSIVE STRESS s c 5.6 psi 307.4 psi 313 psi ; 5.6 psi + 307.4 psi 302 psi ; s t N A + M S 866 lb 153.94 in. 2 + 82,800 lb-in. 269.39 in. 3 N ( P 1 + P 2 ) sin 60° (1000 lb) sin 60° 866 lb 82,800 lb-in. [(900 lb)(144 in.) + (100 lb)(360 in.)] cos 60° M P 1 L 1 cos 60° P 2 L 2 cos 60° SECTION 5.12 Beams with Axial Loads 479 Problem 5.12-6 A vertical pole of aluminum is fixed at the base and pulled at the top by a cable having a tensile force T (see figure). The cable is attached at the outer edge of a stiffened cover plate on top of the pole and makes an angle a 20° at the point of attachment. The pole has length
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