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259_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

# 259_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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SECTION 3.3 Circular Bars and Tubes 253 Solution 3.3-2 Torsion of a drill bit d 4.0 mm T 0.3 N m G 75 GPa (a) M AXIMUM SHEAR STRESS From Eq. (3-12): ; t max 23.8 MPa t max 16(0.3 N # m) p (4.0 mm) 3 t max 16 T p d 3 (b) R ATE OF TWIST From Eq. (3-14): ; u 0.1592 rad/m 9.12 ° /m u 0.3 N # m (75 GPa) a p 32 b (4.0 mm) 4 u T GI P Problem 3.3-3 While removing a wheel to change a tire, a driver applies forces P 25 lb at the ends of two of the arms of a lug wrench (see figure). The wrench is made of steel with

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