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Wastewater of a town is directly discharged into a reservoir, which has a volume of 50*106 m3. The retention time of the reservoir water is 2 years. The 350 residents of the city, each generate an average of 70 kg/year of contaminant A, all of which is discharged into the reservoir with the town's wastewater. The rate constant for decay of contaminant A in the reservoir is k=1.5 (1/year). Assuming the population, discharge rate, and reservoir conditions have been stable for a long time, estimate the concentration of A in the reservoir.
a regular hexagonal pyramid has an upper base edge of 16 ft. and a lower base edge of 28 ft. if the volume of the frustum is 18041 ft^3., find the lateral area of the frustum.
Compare and contrast the purpose and scope of the Federal Insecticide, Fungicide, and Rodenticide Act with the provisions of the Federal Food, Drug, and Cosmetic Act.
Does Bernard have an unfair advantage over firms having designed the project on which he wants to bid?
A flow has circular streamlines. At t=0 the flow is in the clockwise direction and the angular velocity is pi rad/s. This flow exists for 1 s, and then reverses to counterclockwise with an angular velocity of -pi rad/s for 1 s.
Determine the differential settlement between the centre line of the ring beam and under the centre of beam. The inner and outer radii of the ring beam are 8m and 12m respectively.
Find the steel area required for beam which has b = 10 in. and d = 17.5 in. to carry a factored load moment of 1,600 in-kips.
A force, 90 N in magnitude, is applied to control rod AB as shown. Knowing that the length of the rod is 225 mm, determine the moment of the force about point B by resolving the force into components along AB and in a direction perpendicular to AB..
could you please help me to figure out what the meaning of steady state in the pavement management system preservation and rehabilitation.
A saturated sample of clay with an sl 20 has a natural water content of 32%. What would its dry volume be as a percentage of its original volume of Gs.= 2.67.
To remove a nail, a small block of wood is placed under a crowbar, and a horizontal force P is applied as shown. Knowing that the maximum vertical force needed to extract the nail is 2600 N and that the horizontal force P is not to exceed 290 N, d..
Groundwater moves through a sandstone porous media and is driven by a gradient of -0.05 directed at an angle of 60 degree counterclockwise from the x-axis.
an electrical-generation utility sometimes pump liquid water into an elevated reservoir during periods of low electrical consumption. this water is used to generate electricity during periods when the demand for electricity exceeds the utilities a..
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