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A river is 2 m deep. The river bed consists of a depth of sand of saturated unit weight 20 kN/m^3. What is the effective vertical stress 5 m below the top of the sand?
Often times, this pressure comes from the fact that community's water supply is stored in an elevated reservoir. Determine how high an elevated reservoir must be so that the water supply has a pressure of 50 psi. Given: the unit weight of water is..
A steel column has a total unbraced height of 14 ft and carries an axial LRFD load of 950 kips. The column ends are fixed. Select an economical HSS 14x14 for this column.
A tank with a volume of 5,000 gal contains salt solution at an initial concentration (C0*) of 70,000 mg/L, but the concentration in the tank (C) needs to be reduced to 500 mg/L. Two approaches are being considered
An object weighs 289.2N in air and 186.9N in oil of specific gravity is 0.75 find its volume and relative denesity
A model of a submarine, at 1:15 scale, is to be tested at 0.8 ft/s in a wind tunnel at standard at mospheric pressure, while the prototype will be operated in seawater. Both the air and water are at 10 C (50 F).
Establish a grass cover over a 10ha landfill. The root zone of the grass is 40cm deep. Increase the volumetric water content of root zone from 12% to 24%. How many cubic meters of water are needed?
Two new rides are being compared by a local amusement park in terms of their annual operating costs. The two rides are assumed to be able to generate the same level of revenue (and thus the focus on costs).
Using Raoult's Law or Henry's Law, as appropriate, calculate the pressure and mole fractions in the vapor phase for a system containing a liquid that is 0.3% N2 and 99.7% water (by moles) in equilibrium with its vapor at 80 °C.
Is it possible to have a copper-silver alloy of composition 50 wt% Ag-50 wt% Cu that at equilibrium, consists of α and β phases having mass fractions Wα = 0.60 and Wβ=0.40
The top and bottom pull to the left with 10 kips each, the middle part 20 kips to the right. The bolts have a diameter 3/8 inch, determine the average shear stress on the bolt surfaces that are subjected to direct shear.
Need to prepare the CAD drawings
A rectangular copper specimen (Table 1--> E=120GPa) is loaded in tension of 300MPa and then the load is removed. The total plastic strain in the unloaded specimen is e=0.25.
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