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1.A standard five-day BOD test is run using a mix consisting of fourparts distilled water and one part wastewater (no seed). Theinitial DO of the mix is 9.0 mg/L, and the DO after five days isdetermined to be 1.0 mg/L. What is BOD5 ?
2.Two crews are to start at opposite ends of a mountain and dig a tunnel through the mountain. The slower crew could complete the tunnel in 22 months working alone, and the faster crew could complete the tunnel in 12 months working alone. If the slow crew works for 4 months before the fast crew starts, how many months will the crew have to work before the two crews meet and complete the tunnel.
If the barometer reads 102 kPa abs, what is the partial pressure of the dry air, and what is its specific weight. What is the specific weight of the atmosphere (air plus the water vapor present).
A three-span continuous beam ABCD with three equal spans supports a uniform load with intensity q. Determine all reactions of this beam and draw the shear force and bending moment diagrams labelling all critical ordinates.
Determine the pump power in W & hp required to pump water froma tank at the base of the world's tallest building (1667 ft) to ahot tub of similar size on the roof. Ignore friction losses& changes in atmospheric pressure due to change inelevation. Flo..
A sample of clay was obtained from a point below the water table. An oven-drying test performed on this sample resulted in the following data: Mass of can= 10.88 g Mass of can + wet soil = 116.02 g
Calculate the primary consolidation settlement for the CH layer, assuming that it is normally consolidated with a water content of 70% and a compression index of 0.25.
vehicle A enters the interstate and travel at 60 mph for 1/2 hour, stops for 30 mins then continues at 70 mph. If a vehicle B enters the interstate at the same location as A,
The following data represents, in square meters, the cross-sectional areas along a short portion of highway. Calculate the net volume of earthworks needed or available over the portion of the highway.
Compute points on the velocity profile from the pipe wall to the centerline of a 3/4-in Type K copper tube if the volume flow rate of water at 60 degrees F is .50 gal/min.
A 10-year $2000 Bond with a coupon rate of 10% paid semi-annually is available for purchase. What is the maximum you would pay for this bond if your MARR (without inflation) is 6%, and you estimate an inflation rate of 3% annually
A wheel has an initial clockwise angular velocity of 12 rad/s and a constant angular acceleration of 3 rad/s2. A) Determine the number of revolutions it must undergo to acquire a clockwise angular velocity of 15 rad/s.
Determine the vertical stress of 4m below the centre of shallow foundation 3 x 3m carrying a uniform pressure of 275 kN/m3. Plot the variation of vertical stress with depth (up to 10m) below the centre of the foundation
What amount of depreciation will you claim for each calenderyear during the period 1972-1975?
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