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The concentration of UBOD in a river entering the first of two lakes that are connected in a series is equal to 20m/L. If the first-order BOD reaction rate constant (K) equals 0.35 d^-1 and complete mixing occurs in each lake, what is the concentration of UBOD at the outlet of each lake? The flow in the river is equal to 4000 m^3/d and the volume of the first and second lake is 20,000 and 12,000 m^3, respectively. Assume steady-state conditions.
Part B- If the length of the river connection between the two lakes is equal to 3km and the velocity in the river is equal to 0.4 m/s, determine the concentration of UBOD in the effluent from the second lake.
Should the soil be compacted at the dry of optimum or at the wet of optimum condition in order to minimize the swelling potential? Briefly explain the reason for your answer.
Outside factors are related to induced substances (73%) or foreign objects (27%). Natural occurrences are caused by arterial blockage (56%), disease (27%), and infection (e.g., staph infection) (17%). Round your answers to four decimal places (e.g..
The ball at A is kicked such that theta=30 degrees. If it strikes the ground at B having coordinates x=15 ft, y= -9ft, determine the speed at which it is kicked and the speed at which it strikes the ground.
A paddle wheel, inserted inserted into the volume, does 720 KJ of work on the air. If the volume is 2 cubic meters, calculate the entropy increase assuming constant specific heats.
What are the effects of hardness, hot strength and hot hardness and work hardening of work materials
Assuming that the velocity variation within the main channel and the floodplain subsections is much smaller than the change in mean velocities between subsections, find the value of the kinetic energy correction coefficient.
If the purlins are spaced 4 ft and the bents are spaced 25 ft apart, determine the distributed loading that acts along the purlin DF and the loadings that act on the bent at A,B,C,D, and E.
the circular top of a can has a radius of .0320m. the pull-tab has an area of 3.8x10^-4 m^2. the absolute pressure of the carbon dioxide in the can is 1.40x10^5Pa. find the force that these gas generates on the top of a can?
Show that the ultimate load for a strip footing under long-term conditions using the two triangle failure surfaces
An engineering student has been given the assignment of designing a hydraulic holding system for a hay baling system. The system has four cylinders with 120 mm diameter pistons with a stroke of 0.320 m.
Write all code necessary to dynamically allocate an array of 10 double-precision, floating-point variables and then write the code that will de-allocate the memory. Add comment fields to each line of code describing what it is and does.
A compression member is subjected to service loads of 165 kipsdead load and 535 kips live load. The member is 26 feet long andpinned at each end. Use A992 steel and select a W14shape.
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