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A river above a town has a flow of 200 L/s and a BOD5 of 1 mg/L. The river is the receiving water for 25 L/s of treated sewage (BOD5= 25 mg/L) from the town and 25 L/s of untreated effluent (BOD5=175 mg/L) from a pulp and paper mill just downstream from the town. If the BOD5 of the river below the mill outfall must not exceed 5 mg/L, what percent removal of organic matter (BOD5) is required by the mill to meet this requirement?
Prove that given any two distinct non-parallel lines, there exists a unique point that lies on both of them.
you are studying a 3-km stretch of stream that is about 35 m wide. a gaging station onnbspthe stream provides you with
Translate the strings into 16-bit Unicode (using hex notation and the Basic Latin character set).
Calculate the base shear V for the structure - Calculate the relative proportion of seismic forces, hence shears and moments to each of the walls
under what circumstances is there an exception to the general law that an identified original section corner controls the positions of the boundary lines meeting at or passing through the corner
Carnot engine working between a source temperature of T2 and sink temperature of T1 has efficiency of 25%. if the sink temperature is reduced by 20 degrees Celsius the efficiency is increased to 30%. find the source and sink temperature.
A mining firm makes annual deposits of $250,000 into a reclamation fund for 20 years. If the firm must have $10 million when the mine is closed; what interest rate must the investment earn
A glider at 1200 m altitude has a mass of 220 kg and a wing area of 22 m2 . The glide angle is 1.7 degrees, and air density is 1.2 kg/m^3. If the lift coeficient of the glider is 0.83, how many minutes will it take to reach sea level on a calm day?
A cylinder containing R-134a at 60 F, 30 lbf/in.2 has an initial volume of 1 ft3. A piston compresses the R-134a in a reversible isothermal process until it reaches the saturated vapor state. Calculate the work and heat transfer required to accomp..
Water is pumped 9 mi from a reservoir at elevation 100 ft to a second reservoir at elevation 210 ft. The pipeline connecting the reservoirs has a 54-in diameter. It is concrete and has an absolute roughness of 0.003.
Compare the head loss for water flow (Q=5 cfs) in a 12 in. , 3000 ft. long steel pipe using the darcy-weisbach equation and the hazen-williams formula.
what is the minimum value of the laser pulse energy per unit area that can be used to excite SBS? (SBS is often excited by tightly focused laser beams rather than by collimated beams to prevent optical damage to the windows of the cell
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