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1. A 9,000-lb single wheel load is placed on a PCC slab that is 9.5 in. thick. The concrete has a modulus of elasticity of 5 million psi with a Poisson’s ratio of 0.15. The modulus of subgrade reaction is 225 pci. Tire pressure is 90 psi.
(a) Calculate the maximum bending stress if the load is placed at the interior of the slab, assuming the shape of the loaded area is: (i) A circle; (ii) A square. Comment on the practical significance of the discrepancy between the two solution sets.
2.Solid waste production in the United states was 4.3lbs/person-day. Calculate the potential methane production in one year for a land fill that serves a community of 50,000 people. Assume that none of the solid waste is recycled, that all the solid waste can decompose rapidly, and that the density of methane equals 0.717kg/m cubed
One mole of an ideal monoatomic gas initially at 300 K is expanded from an initial pressure of 10 atm to a final pressure of 1 atm. The molar heat capacity for constant volume for the gas is Cv = 3/2 R .
A pump of 80% efficiency lifts water from one large open tank to another; the difference in water surface elevations is 20 feet. The pipe is relatively smooth (f = 0.0122), and has 3 elbows, each with a loss coefficient of 2/3.
Calcium sulfate (CaSO4, solubility product Ksp=2*10^-5 M^2), is added to initially pure water, such that solid CaSO4 remains at equilibrium. (Assume the sulfate does not participate in reaction other than the solubility product; no HSO4- formed).
Wastewater flow of 2000 m3/day containing 120g/L of salt. Discharge into a river with a flow of 34,000 m3/day and a salt concentration of 50 mg/l. The agency wants to maintain the salt level to no greater than 250 mg/L downstream of the discharge.
The fixture AC is designed with a screw adjustment to regulate the height of the 900 N load supported by the roller at A. The screw bears against a smooth surface at B. Determine the reaction forces at points B and C. Neglect the weight of the fix..
a force is specified by the vector F=160i+80j-120k N.calculate the angles made by F with the postive x y and z axes.
A pumped storage power plant is to be designed for a flow rate of 6,000 cfs per penstock. The penstocks are 20 ft. in diameter, with a relative roughness of 0.008. The elevation difference between the two reservoirs is 340 ft.
The elevtion of M is 875 . a transit was set at point M and a leveling rod was held vertically at point N. the horizontal cross line of the telescope was inclined so the reading of the horizontal cross line
A mining engineer plans to do hydraulic mining with a high-speedjet of water. a lake is located H=300 m above the mine site Waterwill be delivered through L=900 m of hte fire house with an inside diameter D
a 200 lb divers stands on the end of the diving board. determine the shear force and bending moment diagrams
Our ESP is collecting 95% of the particles in our exhaust stream. We are under pressure to improve its performance. It has been suggested that if we were to cool the inlet gas from the present 600°F to 250°F
An engineer is required to survey a nonrectangular plot of land but is unable to measure side UT directly (see Figure 2.11). The following data are taken: RU=130.0m, RS=120.0m, ST=90.0m, angle RST= 115 degrees, and angle RUT= 100 degrees.Calculate th..
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