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1.A result of a 7-day BOD test performed on a sample from anoligotrophic lake was 10 mg/L. The base 'e' BOD rate constant determined from previous studies was estimated to be 0.10d-1. Determine the ultimate BOD and 5-day BOD of the sample taken from the lake.
2.The evaporation rate from the surface of a 3,650-acre lake is 100 acre-ft/day. Estimate the depth change in the lake in feet during a 1-year period if the net inflow to the lake is 25 cfs. Is the depth increasing or decreasing? What is the change in centimeters?
It rains an average rate of 0.4 in/hr in a 600 acre watershed for 3 days. Determine: a) average rainfall rate in cfs b) rainfall volume for the 3 days in acre-ft c) rainfall volume in inches.
A vertical hydraulic cylinder has a 150-mm diatomic piston with hydraulic fluid inside the cylinder and an ambient pressure of 1 bar. Assuming standard gravity, find the piston mass that will create a pressure inside of 1250kPa.
The station and elevation of the PVI is 8+17.36 and 76.85 ft. Assume that there will be stakes placed at the PVI, BVC, and EVC, the low (or high) point, and at all the 100-ft stations.
a ceramic matrix composite contains internal flaws as large as 0.001 cm in length. The plane strain fracture toughness of the composite is 45 MPa sqr(m), and the tensile strength is 550 MPa.
A floor system consists of wide flange steel beams (W18 x 60) equally spaced at 8ft center to center. A 6inch reinforced concrete slab spans between beams. The bottom of the slab is coated with plaster and the top of the slab has ¾inch hardwood fl..
what does the free body analysis look like and how to calculate the loads into the horizontal and vertical members of a free standing jib hoist with a 15' boom and 5000 pound capacity
A 0.02wt% C steel is to be carburized at 1200°C in 4 hrs with a point 0.6mm beneath the surface reaching 0.45wt%C. calculate the carbon content required at the surface of the steel.
1.for the pinned frame below subjected to a 500 kn lateral force what are the internal forces in each member? 2.for a
The rod has a uniform cross-section of 53mm2. The external load consists of point loads: two P1 of 3kN, two P2 of 1kN, and one P3 of 7kN. What is the normal stress at the fixed support
To remove a nail, a small block of wood is placed under a crowbar, and a horizontal force P is applied as shown. Knowing that the maximum vertical force needed to extract the nail is 2600 N and that the horizontal force P is not to exceed 290 N, d..
The motor-generators installed with these pump-turbines have an efficiency of 0.85 when operating as motors and 0.91 when operating as generators. Each pump-turbine uses its own 100-m-long, 150-cm steel penstock.
If the coefficient of sratic friction between the wheels at B and the ground is 0.5 determine if it is possible to pull at p=1200 lb without causing the wheels at B to slip or the front wheels of A to lift off the ground
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