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(a) Calculate the hydraulic residence times (the retention time) for Lake Superior and for Lake Erie using data in Table 4.4.
(b) Assume that both lakes currently are polluted with the same compound at a concentration that is 10 times the maximum acceptable level. If all sources of the compound are removed, how long will it take the con-centration to reach acceptable levels in each lake? Assume that the pollutant does not decay chemically.
(c) Comment on the significance of your answers.
The problem belongs to Civil Engineering and it is clarify about calculating benefits cost ratio for 3 different proposals for building a highway and its yearly maintenance and other benefits.
A 57.0 kg skier is being pulled up a 13.0° slope by a steelcable. The cable has a cross-sectional area of 7.18 10-5 m2. The cable applies a force tothe skier
a four-lane freeway two lanes in each direction is on mountainous terrain with 11ft lanes a 5ft right-side shoulder
A rectangular channel has water flowing at a depth of 1.6 ft with a corresponding specific energy of 1.736 ft. A step up on the channel bed resulte in the flow becoming critical. The critical depth is 1.29 ft and corresponding specific energy is 1..
Compute the volume of a waste sludge with 96% water content containing 1000 lb of dry solids. If the moisture content is reduced to 92%, what is the sludge volume
A train moving at 100 km/hr decreases its speed to 80 km/hr in 3.5 seconds. How far, in meters, did the train travel during this time
If a mortar is proportioned to 0.11 ft3 of cement, 0,03 ft3 of lime, 0.27 ft3 of water, and 0.50 ft3 of sand, the percent voids in the sand is? (Assume a sand Bulk Specific Gravity Oven-dry of 2.60; of cement 3.15, and lime 2.25 if needed).
Taking k = 1.33 and R = 0.287 kJ/kg · K for the products of combustion, and assuming the expansion process to be isentropic, determine the power output of the turbine per unit mass flow.
The results of his experiment are tabulated below. Assuming the experiment was conducted in a completely-mixed batch reactor, determine the decay rate constant for the die-off of anthrax.
the car weighs 2450 lb, the mechanical efficiency of the drivetrain is 90% and the wheel radius is 14 inches. the base engine develops 200 ft-lb of torque, and a modified version of the engine develops 240 ft-lb of torque.
A variable-order reaction A-->B has the following rate expression: R(a) = -kC(a)/(K+C(a)) where k = 5mg/L-hr and K=40mg/L The reaction is to take place in a batch reactor. The initial concentration is 450 mg/L
Write an equation on the line containing the given point and parallel given line. Express answer in the form y=mx+b (3,7) x+6y=5
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