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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?
Also, at the failure cross sections the diameters are found to be 0.731 in., 0.645 in., and 0.587 in., respectively. Determine the percent elongation and percent reduction in area of each specimen.
The temperature = 25°C; assume that u = 10^-2 after the addition. Compare the value obtained when ionic strength effects are taken into account with that calculated when it is neglected.
A solid titanium is titghly inserted into a hollow section of length l/2 and constan thickness t=7.5mm , and extends from end B towards end A. determine the shear streess and angle of twist at B.
Do the problem again but for an alum or iron floc with an overflow rate 20 m3/day.m2?
the wind reaches a speed of 27.8 m/s in a storm. calculate the force acting on a 1m x 2m window facing the storm. the window is in a high-rise building. the air density p= 1.2 kg/m3.
The given data show the result of a model known as stopping sight distance, used by civil engineers to design roadways speed(mph) stopping sight distance(ft)
If the air-conditioning costs of a house are $500 a year, determine how much the trees will save the home owner in the 20-year life of the system.
7 crystal systems,....... cubic, tetragonal, orthorhombic,rhombodedral, hexagonal, monoclinic, and triclinic. withvariations there should be 7X4= 28, however due to duplicates thereare only 14. for each of the variations listed below, whichof the 14 ..
Nighttime traffic on a single lane of rural highway is light, with a flow of 40 vehicles/hour , and is well described by a Poisson arrival process.
The heat resisting alloy S-590 is used for a component that will be exposed to 700°C. With a safety factor of two on the time, determine the maximum static stress the component must sustain in order to have a service life of 10000 hours.
A concrete beam that is simply supported sustains a uniform live load of 1.8 kips/ft and a uniform dead load (not including self weight) of 1 kips/ft on a span of 24 ft. Determine the layout for a set of No.3 U-stirrups with Fy=60 ksi and F'c=3.5 ..
Cooling at constant pressure followed by heating at constant volume. Calculate Q, W, change in U, and change in H for each of these processes, and sketch the paths of all processes on a single PV diagram.
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