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Zhe develops truss analysis software for civil engineers. He has the opportunity to contract with at most one of two clients who have approached him with development proposals. One contract pays him Si5 000 immediately, and then S22 000 at the end of the project three years from now. The other possibility pays S20 000 now and S5000 at the end of each of the three years. In either case, his expenses will be S10 000 per year. For a ALARR of 10%, which project should Zhe accept? Use an appropriate rate of return method.
Steam expands isentropic ally through a turbine from 6MPa and 600C to 9.593 kPa. Write mass, energy, and entropy balances for this process. Calculate the power output if the mass flow is 2 kg/s.
determine the flow rate and direction in all pipes. If pA= 120 lbf/in2 gage, determine the pressures at points B, C, and D.
a cylindrical pressure vessel with outside diameter 8 inches and thickness frac14 inch is expected to hold pressures of
The values given in parts (a) and (b) are for 1 mol of sulfur; however, in crystalline and liquid sulfur, the molecule is present as S8. Convert the values of the enthalpy and entropy of fusion in parts (a) and (b) to those appropriate for S8.
what are the two possible arrangements for a concentric tube heat exchanger? for each arrangement what restrictions are
Air enters the evaporator of an air conditioner at 14.7 psia, 90F, 200 ft3/min. R-134a at 20 psia, 30% quality enters at 4 lbm/min and leaves as saturated vapor at the same pressure. Find the exit temp of the air and the rate of heat transfer from t..
An air conditioner maintains the temperature of a dwelling at 72 degrees Fahrenheit when it is 96 degrees Fahrenheit outside. If heat is transferred through the walls and ceiling at 35,000 BTU/hr. a) What is the minimum power required to run the Air..
At a point in a loaded body the stresses relative to an xyz coordinate system are given by the following stresses in MPa xx=xy=40, xz=30, yy=zz=20, xz=0. Determine the normal stress and shear stress on a plane whose outward normal is oriented at angl..
a cyclic device operating as a refrigerator is being used to cool two refrigerated spaces. the first space is being
Casting can be used to make a sphere. But is there any chance we can machine it to proper surface tolerances ?
Prob. 8.46 The machine part ABC is supported by a frictionless hinge at B and a 10° wedge at C. Knowing that the coefficient of static friction is 0.20 at both surfaces of the wedge, determine (a) the force P required to move the wedge to the left..
A piston cylinder holds air at 80 degree F and 15 psi. During an adiabatic process the pressure increased to 165 psi and the entropy generated is 0.15 Btu/lb-degree R. Determine the isentropic efficiency for this
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