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Groundwater is pumped for domestic use from an unconfined aquifer (water-bearing sand layer). The thickness of the clay layer above the sand layer is 20 m and its initial porosity is 40%. After 10 years of pumping, the porosity is reduced to 30%. Determine the subsidence of the clay surface.
A barge is 60ft long, 20ft wide, and 8ft deep. When empty, it weighs 210,000lb, and its center of gravity is 1.5ft above the bottom. Is it stable when floating in water?
What is the second year book value for equipment with an initial cost of $11,000, a salvage value of 1,000 and a recovery period of 5 yrs for A. straight line depreciation. B. Double declining balance. C. MACRS?
Traffic signals were installed at an intersection involving two one-way streets. Suppose 75% of the vehicles will decelerate when they see the amber light, whereas 20% will accelerate and 5% are "indecisive" and simply continue with the same speed..
Estimate the convective heat transfer coefficent for natural convenction from a horizontal steam pipe. The outside surface temperature of the insulated pipe is 80 degree C. The surrounding air temperature is 25 degress C.
The sediment sample is 30 cm long. The porous plates on top and bottom of the sample holding it in place have a vertical hydraulic conductivity of 0.001 cm/s and each have a thickness of 10 cm.
A maximum flow rate of 6 CFS is available for a river model. This corresponds to 30,000 CFS for the prototype. What is the scale of the model in terms of the prototype size?
this concentration is based on an assumption that the individual is generally healthy and is exposed for 8 hours per day over a working lifetime ( that is from age 18 to 65 years). assuming a body weight of 78 kg and an inhalation rate of 0.63 m^3..
What is the resultant force on one side of a 25cm diameter circular plate standing at the bottom of 3m of pool water
Determine the unfactored dead load and live load on a typical interior roof beam, sketch the loading on the beam, and draw the shear and moment diagrams for the beam assuming the beam is simply-supported.
A certain gas weighs 16.0 N/m3 at a certain temperature and pressure. What are the values of its density, specific volume, and specific gravity relative to air weighing 12.0 N/m3 ?
Determine the required pumping rate. the aquifer has T= 1600 m 2 /day and the wells each have radius of influence of 600m.
Determine the chemical oxygen demand (COD) of a mixture of 250 mg/l glutamic acid (C5H10N2O3) and 200 mg/l of glucose(C6H12O6).
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