Estimate the re-aeration constant assuming the mean depth of the river is 1.5 meters and the mean velocity is 0.1 m/s.
The Ganges River, shown in Figure 4.66, has an annual average flow rate of 12,105 m3/s. The average temperature of the Ganges River was reported to be 24.6ºC. The Ganges has become contaminated with raw sewerage and industrial waste so that the dissolved oxygen in the river upstream of sewerage discharges is 4.6 mg/L. Suppose that the raw sewerage that is untreated flows into the Ganges at a rate of 460 m3/s, the temperature is 25ºC, and the dissolved oxygen in the sewerage stream is completely depleted (i.e. DO = 0). How would you develop a plan for improving water quality in the Ganges River?
What will be an ideal response?
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A. masonry saw B. tuckpointer's grinder C. paver saw D. mortar grinder
Amigo Mobility, which manufactures battery-powered mobility scooters, has $700,000 to invest. The company is considering three different battery projects that will yield the following rates of return:
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A relay whose contacts are touching when current is applied to the coil is
A) an NC relay. B) deenergized. C) a NO relay. D) all of the above.
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A. A only B. B only C. both A and B D. neither A nor B