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To achive a specific level of disinfection a water treatment plant operator determines the" Ct" value 180mg min/l is necessary with units for disinfectant concentration C in mg/l and disinfectant contact time t in minutes. if the operation can very disinfectant concentration between 2-15mg/l, what range of reactor volumes is necessary to achieve the desired contact times for plant of flow 0.4m^3/s?
Helium(15 degrees celsius, 1atm) will be transported in a straight horizontal copper tube over a distance of 150 m at a rate of 0.1 m^3/s. If the pressure drop in the tube should exceed 6 in h20, what is the minimum pipe diameter
A buried stock-water pipeline conveys water from a water source at Point 1, rises to pass up and over the peak of a hill (Point 2) before falling to Point 3 in the pipeline some
a vehicle pulls out onto a single lane highway that has a flow rate of 280 vehhr poisson distributed. the driver of the
During the rainy season in a tropical country, the probability of a day being dry is 0.10. A dry day is defined as one without significant rainfall. Assuming that the number of days until the next dry
A uniform thin column of length L, positioned vertically with one end embedded in the ground, will deflect, or bend away,from the vertical under the influence of its own weight
The testing machin that covers the right range of load is to be chosen. it is expected to load the material up to a strains of 3%. if th material must remain elastic over that range, what would be the maximum load
Two identical uniform boards, each of weight 40lb, are temporarily leaned against each other. Knowing that the coefficient of static friction between all surfaces is 0.40
The maximum and minimum dry densities, determined by standard laboratory tests, are 1.81 and 1.54 Mg/m^3, respectively. Determine the density index of the sand.
To avoid the salinization of soil in a farming area, parallel drainage canals are to be installed to maintain the water table at a depth of at least 4m below the ground surface. It is thought that no evapo-transpiration would occur below that dept..
the rigid bar abcd is supported by a pin at B and restrained by identical steel bars at C and D, each of area 250mm^2. if the temperature is increased by 80C, determine the force P that will cause the bar at c to be stress-free.
Design a concrete column of 14 ft high to support a dead load of 80 kips and a live load of 200 kips. f'c= 6,000 psi fy= 60,000 psi
If t his house were heated instead by a heat pump that has an average COP of 2.4, determine how much money the homeowner would have saved that month. Assume the price of electric power is $0.085 per kW - hr.
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