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A CM reactor receives influent containing 10.0 mg/L of tracer for 2 h. Then tracer addition is terminated but the flow remains steady. The volume of the reactor is 10 L and the flow rate is 2 L / h. What is the concentration of tracer in the reactor 1 h after tracer addition is terminated? The reactor had an initial concentration of tracer of 1.0 mg/L when tracer addition commenced.
The volume of the first pond is 5.0 million gallons, and the second pond is 3.0 million gallons. Assuming complete mixing within each pond, find the BOD concentration leaving each pond
Determine the required thickness of the pipe wall if the operational pressure head (pressure head in the pipe under regular flow conditions) is 40 m and if the flow control valve on the downstream end closes suddenly, developing a water hammer in ..
The boat is travelling along a circular path with a speed v=(0.0625t). Determine the magnitude of its acceleration when t=10s
a simple beam with a pin support at A on the left side of my beam, and a roller connection 20 feet away on the far right side of the beam labeled C, with the midspan point (10 feet) labeled B.
An activated sludge process receives 4000m^3 / day containing 120 mg BOD /L from the primary settling tank and 3500 m^3/day Containing 25mg BOD/L from the secondary settling tank.
A steel tube has an outside diameter of 2.5 inches and an inside diameter of 2.375 (1/8" thick). If it transmits 35 hp when turning at 2700 rpm, what is the maximum shear stress
An isolated system contains an incompressible substance with heat capacity C = kT, where k is a constant. The system is initially divided in two parts, with 1/3 of the mass at T1 and 2/3 of the mass at T2.
One can lease a car for $550 per month with no down payment or purchase one for $20,000 now. If the nominal interest rate is 8% per year, how many months of use necessary for the two to break even
Draw circle and put line with angle inside the circle that reflected in it. Make sure the measurement is punctual for each one. Angels required are 20-40-60 degrees. that means you have to draw three circles.
Find the center of gravity of the given composite body when the specific weight of brass is .306 lb/in^3 and the specific weight of aluminum is .101 lb/in^3
The viscosity of a fluid can be measured in an experiment by dropping a small ball into a calibrated tube containing the fluid and observing the random variable X, the time it takes for the ball to drop the measured distance.
A company that manufactures regenerative thermal oxidizers made an investment 10 years ago that is now worth $1,300,000.
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