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An ocean outfall diffuser that discharges treated wastewater into the Pacific Ocean is 500m from a public beach. The wastewater contains 105 coliform bacteria per milliliter. The wastewater discharge flow rate is 0.3 m3/s. The coliform first order death rate in seawater is 0.3 1/h. The current carries the wastewater plume toward the beach at a rate of 0.5 m/s. The ocean current may be approximated as a pipe carrying 600m3/s of seawater. Determine the coliform concentration at the beach. Assume that the current behaves as a plug flow reactor and that the wastewater is completely mixed in the current at the discharge point.
A small truck is to be driven down a 4% grade at 70mi/hr. The coefficient of road adhesion is 0.95, and it is known that the baking efficiency is 80% when the truck is empty and decreases by one percentage point for every 100 lb of cargo added.
{rm Al} reacts with 4.45 {rm g} of {rm O}_{2}, what is the empirical formula of aluminum oxide?
If log KSO, calcite (CaCO3(s)) = -8.61 at 50 oC, would calcite be over- or under- saturated in a hot water heater at 50 oC if the water was in equilibrium with calcite at 25 oC (log KSO = -8.30) when it entered the house
Break Even Stripping Ratio (BESR), Given an underground total mining cost of $8.85 per tonne, surface mining costs of $2.95 per tonne of ore, and surface mining stripping costs of $1.75 per tonne of waste
If for parathion, the activation energy is 15.4 kcal/mole and A = 8.1 x 109 at a pH = 7.8, how many days will the fish hatchery have to contain the river water if T = 15 oC (winter time)
A fish hanging from the bottom of the spring oscillates vertically at a frequency of 2.00 Hz. Ignoring the mass of the spring, what is the mass of the fish?
You have a $1,500 monthly loan payment. If inflation is 3.5% annually (compounded monthly). What is the constant dollar amount of this payment in your 80th month
The car weights 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.
The 2 Mg car is being towed by a winch. If the winch exerts a force of T=105s on the cable, where 14m is the displacement of the car in meters, determine the speed of the car when s , starting from rest. Neglect rolling resistance of the car.
A building frame is made with a 10" square steel box shape that has an area of 15 in^2 and a moment of inertia I =225 in^4. The frame consists of pinned supports at points A and F and an internal pin at point D.
The elastic modulus is 40 GPa, the yield stress is 150 MPa, the ultimate stress is 525 MPa, and the ultimate strain is 0.38 (mm/mm). Perform the following tasks for this material. compute the tangent modulus between yield stress and ultimate stres..
For construction of an embankment, the soil is transported from a borrowed area using a truck which carries 5.5 m^3 of soil at a time, with the following details: For the Borrowed Pit: bulk unit weight= 16 KN/m^3 and moisture content = 6.7%
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