exam1-old - washer(Fig A Failure of the washer A can cause...

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ME 341 In-term exam 1, 13.3.2007, 95 minutes Notes: a) Draw figures (free-body diagrams and other helpful diagrams) as necessary and indicate quantities clearly. b) Show your axes . c) Indicate units . d) Write neatly. Make sure what you write is readable . ------------------------------------------------------------------------------------------------------------------------------------------ 1) (14 pts.) Define the following: a) St. Venant’s Principle, b) modulus of resilience, c) modulus of toughness, d) ductility, e) brittle material, f) isotropic material, and g) homogeneous material . 2) (20 pts.) The 1000-lb load is being hoisted at a constant speed using the motor M, which has a weight of 110 lb. (M and the curved arrow do not indicate a moment.) Determine the resultant internal loadings acting on the cross-section through points B, C, and D in the beam. The has a weight of 40 lb/ft and is cantilevered to the wall at A. 3) (20 pts.) The steel bushing is held in place using a nut and a
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Unformatted text preview: washer (Fig. A). Failure of the washer A can cause the rod to separate (Fig. b). If the maximum average shear stressfor the washer is τ max = 18 ksi, determine the force F to be applied that will cause this to happen. The washer is 1/16 inch thick. 4) (20 pts.) The pole is supported by a pin at C and an A-36 steel guy wire AB. If the wire has a diameter of 0.2 in., determine a) how much it stretches under the force, b) displacement of point B (assume B moves horizontally). Take E st =30x10 6 psi. 5) (20 pts.) The bar has a length L and cross-sectional area A. Determine its elongation due to P and its own weight. The specific weight (weight per unit volume) of the material is γ and its modulus of elasticity is E. 6) (20 pts.) A thin wire, lying along the x-axis, is strained such that each point on it is displaced by u = kx 2 along the x-axis. (k is a constant.) What is the normal strain at any point along the wire?...
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