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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.
At a specified point on a highway, vehicles are known to arrive according to a Poisson process. Vehicles are counted in 20-second intervals, and vehicle counts are taken in 120 of these time intervals.
A rectangular clarifier with a length:width ratio of 3:1 receives a flow of 850m3/day. the clarifiers depth is 4.0m and the detention time of the water inthe clarifier is 2.4 hrs, what are the surface overflow rate and the horizontal flow through ..
calculate the moment of inertia for the Milkyway. Assume it to be a disk.
What is the minimum distance from the stalled car at which the driver could apply the brakes and still stop before hitting it? Assume coefficient of rolling resistance of 0.013.
Explain CBR method of pavement design with one example.
What is the concentration of MLVSS in the activated sludge (mg L-1)
If the BOD5 of the river below the mill outfall must not exceed 5 mg/L, what percent removal of organic matter (BOD5) is required by the mill to meet this requirement?
What is the equivalency factor for the 14 kip single axle?
A freeway has a capacity of 4500 veh/hr. A traffic accident occurs at 9AM and the freeway is closed. At 9:15 AM, the freeway is partially opened with capacity of 1500 veh/hr. Freeway is restored to full capacity 4500 veh/hr at 9:30 am.
To float a 160 pound man using helium balloons (assume 0.52 cubic feet per inflated balloon). How many balloons would it take? Assume density of air is 1.29 kg/cubic meter and the density of helium is 0.179 kg/cubic meter.
Introduction to management science, The Dynaco Manufacturing Company produces a particular product in an assembly line operation. One of the machines on the line is a drill press that has a single assembly line feeding into it.
a child is flying a kite at a height of 40 ft and the kite is moving horizontally at a rate of 3 ft/sec. if the string is taut, at what rate is the string being paid out when the length of the string is 50 feet.
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