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A chemical mixing basin is to be designed to blend chlorine and treated wastewater. The basin flow is 700 gallons per minute and the basin dimensions are 5 feet by 5 feet by 5 feet water depth. The basin will have a single mechanical blender that will transfer 100% of the mixing energy from the blades to the water. The wastewater temperature will vary from 35 F to 70 F. The selected mixing intensity in the basin shall be a minimum of 600 1/sec. What size motor (horsepower) is required for the mixer?
Wastewater enters and anerobic pond at a BOD of 246 mg/L and a flowrate of 0.1 m^3/s. The waste degrades at a rate of 0.40d. Effluent from the lagoon must have a BOD of 23.9mg/L.
Block D sits freely on the homogeneous bar and experiences a gravitational force of 50N. Homogeneous bar AB experiences a gravitational force of 25 N. What is the force between the bar and block D?
If they plan to increase their savings by 5% each year, how much must they invest in the first year given that they expect to earn 4% per year on their investment?
What is the average length of queue, the average time spent in the system, and the average waiting time in the queue?
The three hinged arch is composed of segments of a circle. Support points A and D are not at the same level.Determine: (a) the horizontal and vertical components of reaction at A and D.
Calculations with steam mixed with additional steam at a different pressure, A steam press at 650Kpa + dryness fraction of 0.9% flows along a pipe at a rate of 3.5Kg per second
What is the minimum distance from the stalled car at which the driver could apply the brakes and still stop before hitting it? Assume coefficient of rolling resistance of 0.013.
A vane, 10 cm long and 8 cm in diameter, was pressed into soft clay at the bottom of a bore hole. Torque was applied and gradually increased 45 N-m when failure took place. Subsequently the vane rotated rapidly so as to completely remould the soil..
The spillway for a dam is 20 m wide and is designed to carry 125 m3/s at flood stage. A 1:15 ratio model is constructed to study the flow characteristics through the spillway. The effects of surface tension and viscosity can be neglected.
Consider a wide flange steel beam of size W10x60 subjected to a negative bending moment of 24 kip ft. Calculate the maximum compressive and maximum tensile stresses and indicate where the stress will be tensile and where compressive.
For maximum undercooling, calculate the size of the critical radius and the number of atoms in the critical nucleus when solid copper forms by nucleation.
THe upper end of the spring is welded to the lunger and the lower end is welded to the base plate. If the plunger is lifted 1.5" above equilibrium and released from rest, calculate its velocity as it strikes A.
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