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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.
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.
The base engine develops 200 ft-lb of torque, and a modified version of the engine develops 240 ft-lb of torque. If the overall gear reduction ratio is 8 to 1, what is the maximum acceleration from rest (in ft/sec^2) for:
consider a spacecraft that is positioned directly between the earth and moon.the mass of the moon's is approximately 7.35 X10^22 kg, and at the instant under consideration, the moon is 3.8 X 10^8 km from earth.
A sample of coarse aggregate weights 1072 grams when oven-dried, 1091 grams when saturated surface-dried, and 667.6 grams when submerged. Calculate the bulk specific gravity, apparent specific gravity, and percent absorption.
Assume a time to peak of 15 minutes and the unit peak discharge is 7.0 cfs/in, using the Gamma Function Unit Hydrograph what is the unit discharge at 20 minutes
The force is applied at the two pins. The pins allow rotation around the z-axis and do not allow rotation around the y-axis. The length of the beam between the pins is 8m. Determine the maximum allowable compressive force that can be applied.
An industry discharges PCE (tetrachloroethene, tetratchloroethylene, or perchloroethylene) into a small, well-mixed lake. The influent concentration is 0.4mg/L and the hydraulic residence time of the lake is 5days.
If the column is subjected to an axial compressive force of 800 kN, determine the required diameter of each reinforcing steel bar so that one-third of the load is carried by the steel and two-thirds by the concrete. Assume Esteel= 200 GPa and Econ..
Assuming that the average stack gas velocity is 10.0m/s and the stack is circular with a 3.0 meter diameter, calculate the mass emissions rate of NO2 in kg/day.
A gate having the cross section is 4 ft wid and is hinged at C. The gate weighs 18,000 lb, and its mass center is 1.67 ft to the right of the plane BC. Determine the vertical reaction at A on the gate when the water level is 3 ft above the base.
you fill a 2-cubic foot wheelbarrow to the top with aggregate. if the specific gravity of the aggregate is 2.548 and 18% of the aggregate is void spaces, how much does the aggregate in the wheelbarrow weight?
Calculate the IEEE double precision floating number immediately greater than the minimum number in double precision in both binary and decimal form
an embankment for a highway 30m wide & 1.5m in a compacted thickness is to be constructed from a sandy trucked from a borrow pit.
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