11. The truss ABC shown in the figure supports a horizontal load P and a vertical load P2. Both bars have cross-section area A and are made of steel with Young's modulus E. Determine the strain energy in the truss.

6.14. A 2 m x 3 m spread footing placed at a depth of 2 m carries a vertical load of 3000 kN and a moment of 300 kN-m, as shown in Figure P6.14. Determine the factor of safety using Meyerhof's effective area method.

6.7. Determine the maximum column load that can be applied on a 1.5 m x 1.5 m square foundation placed at a depth of 1.0 m within a soil, where y= 19.0 kN/m, d = 10 kN/m^2, and = 24°. Allow a factor of safety of 3.0.

If for a strain gauge, the Gage Factor is given as 2, and nominal gauge resistance R given is 120 Ohm,what will be the change in resistance for a strain of 5 micro strains, (equivalent to 50 psi for Aluminum)?

2B. Calculate the total building seismic base shear, V, in the north-south direction only.Assume the total seismic weights of each floor are: Roof = 150 kips, 3rd Floor = 700 kips,2nd Floor = 900 kips (note these are not the answers to 2A!). Use Ss = 0.616, Sj = 0.274.The lateral force resisting system is a Building Frame System with special reinforced concrete shear walls. The building capacity is more than 500 students (Risk Category Ill)and the soil site class is D.

A solid 40-mm-diameter shaft is used in an aircraft engine to transmit 115 kW at 1,300 rpm to a propeller that develops a thrust of 15 kN. Determine the principal stresses and the maximum shear stress at any point on the outside surface of the shaft.

A hollow steel shaft is expected to transmit 4200 N-m of torque and is to be sized so that the torsional stress does not exceed 120 MPa. (a) If the inside diameter is 70 percent of the outside diameter, what size shaft should be used? Use preferred sizes. (b) What is the torsional stress on the inside of the shaft when full torque is applied?

Suppose you want to connect a remote speaker to your stereo. It needs to be 100 inches away.You are using copper wire. What should be the diameter of the wire if the resistance of each wire must be less than 0.10 Q? (3 marks) \text { Given: (Resistivity of copper } \left.=1.7 \times 10^{-5} \mathrm{~W}_{\mathrm{m}}\right)

For the support of Prob. 1.47, knowing that the diameter of the pins d = 16 mm and that the magnitude of the load is P 20 kN,determine (a) the factor of safety for the pin, (b) the required values of b and e if the factor of safety for the wooden member is the same-as that found in part a for the pin.

6.17. A 2.0 m x 2.0 m square pad footing will be placed in a normally consolidated clay soil to carry a column load Q. The depth of the footing is 1.0 m. The soil parameters are: d = 0, O = 26°,y= 19 kN/m, and cu = 60 kN/m^2. Determine the maximum possible value for Q, considering short-term and long-term stability of the footing.