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Two shallow lagoons connected in series, each having a surface area of 5 km^2 and depth of 1m, are receiving 8640 m^3/day of sewage containing 100mg/L of biodegradable contaminant. At a steady state, the concetnration of the contaminant in the effluent from the second lagoon must not exceed 20 mg/L. Assuming the lagoons are well mixed and that there are no losses or gains of water in the lagoon other than the sewage input, what biodegradation reaction rate coefficient (in day^-1) must be achieved for a first order reaction that governs the degradation of the contaminant
Find out the number of turns in each spring, if the diameter of the spring wire 14 mm and the diameter of coil is 80 mm. Assume C=84 GN/mmxmm.
A large tank is used to calibrate the reading from a flow meter. Measurements of the system weight as a function of time are made. Water enters the tank vertically from the flow metering system at a speed of 20 ft/sec through a 1.5 in.
When a particle falls through the air, its initial acceleration a=g diminishes until it is zero, and thereafter it falls at a constant or terminal velocity v_f . If this variation of the acceleration can be expressed as a=(g/v^2_f)(v^2_f-v^2)
Water flows through a horizotal 45 deg reducing bend with a 36 inch. diameter upstream and a 24 inch diameter downstream, at the rate of 20 cfs under a pressure of 15 psi at the upstream end of the bend. Neglecting head loss in the bend, calculate..
Compute the ratio of the nominal flexural strength of the beam to the maximum service load moment, and compare your findings to the ACI load factors and strength reduction factor.
Ask question ellipse construction via foci method
A stack (T=550 F and P=750 mmHg) was sampled using EPA Method 5. The total gas volume that flowed through the dry gas meter was 2.785 cubic meters (at T=60 F and P=800 mmHg).The mass of particles collected was 1.50 g.
A loose uniform sand with rounded grains has effective grain size of 0.05 cm. What will be the Coefficient of permeablity of sand
If the allowable shear stress in the 7/8" diameter bolt is 35 ksi, determine the allowable force F that may be applied.
An excursion train, travelling at 80ft/s, encounters a rain shower. The point A lies directly 8ft. beneath the lip of an overhang in the observation car. The raindrops can be assumed to be falling at a constant speed of 40ft/s.
A horizontal curve is being designed around a pond with a tangent length of 1200 ft and central angle of 0.5211 radians. If the PI is at station 145 + 00, determine the station of PT.
Google budgets for an energy consumption of the pump for this system of 2MW. If the pump 1 has an efciency of n= 87%, what is the ow rate of sea water through this tunnel
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