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The total flow at a wastewater-treatment plant is 600 m3 day-1 . Two bio-logical aeration basins are used to remove BOD from the wastewater and are operated in parallel. They each have a volume of 25,000 L What is the aeration period of each tank in hours?
Northern Tundra Telephone (NIT) has received a contract to install emergency phones along a new 100-mile section of the Snow-Moose Turnpike. Fifty emergency phone systems will be installed about 2 miles apart
It is desirable to produce a copper-nickel alloy that has a minimum noncold-worked tensile strength of 390 Mpa and a ductility of at least 40% elongation. Is such an alloy possible If so, what must be its composition
Explain the principles of structural analysis - Determine the compressive stress in the column and what is the necessity of using this factor while designing and On what parameters does this factor depend on?
Calculate the drawdown at the well (use r which is the distance from the pumping well = 18 in) with total withdrawals from storage
Phenol undergoes a first-order decay reaction in the CSTR with rate constant, k = 0.50 hr^-1. The current industrial pre-treatment permit for Phenol is 20 mg/l. The permit limitation may be changed, either higher or lower, in the future.
A concrete test cylinder 200 mm in diameter by 400 mm high is tested to failure. The compressive strain at failure is 0.0012. Determine the total amount the cylinder shortens before failure.
The wet mass of a sample of saturated soil is 520 grams. The dry mass, after oven-drying, is 400 grams. Determine the a) water content b)void ration c)saturated unit weight, and d)effective unit weight
Explain the merits of the construction practice of drilling 1/8″ pilot holes into a post-tensioned concrete deck prior to drilling for 1/2″ expansion anchors. What concerns might the structural engineer have with drilling into a post-tensioned con..
The back tangent gradient is -4 percent, the forward tangent gradient is 2 percent, and the elevation of the curve at station 48+50 must equal to at least 510ft. What is the required length of the curve?
describe the difference between population standard deviation and sample standard deviation. describe a scenario in
A foot valve for a pneumatic systemis hinged at B. Knowing that a=28degrees, determine the moment of the l6-N force about point B by resolving the force into horizontal and vertical components
Create an isometric drawing from scratch. The drawing must be detailed and more difficult than a normal project given in class. To receive full credit you must create two separate layers, one for the drawing itself and one for dimensions.
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