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The settling velocity of alum floc is approximately 0.0014 fps in water at 10 degrees celsius. Calculate the equivalent overflow rate in gpd/ft squared. What is the minimum detention time in hours to settle out alum floc in an ideal basin with a depth of 10 ft?
The chemical 1,4-dichlorobenzene (1,4-DCB) is sometimes used as a disinfectant in public lavatories. At 20°C (68°F) the vapor pressure is 5.3 × 10-4 atm. (a) What would be the maximum concentration in the air in units of g/m3
a 25-mm diameter steel cylinder 300-mm long falls, because of its own weight, at a uniform rate of 0.1 m/s inside a tube of slightly larger diameter. A castor-oil film of constant thickness is between the cylinder and the tube.
One way to treat amd is to treat the metals in a holding pond. The first order rate constant is 10/day. The concentration in the water must be below 5 ppm. How long in hours will it take to reduce the concentration from 250 ppm to 5 ppm
A soil sample is prepared in the laboratory by mixing a certain amount of dry soil with 10.5 wt% water. The relative density of the grains of the material is equal to 2.7.
During the process 40 kJ of heat is transferred from the sphere, while the sphere receives energy in the form of work equal to 20kcal. calculate the change in the sphere's internal energy in kJ.
In its natural state, a moist soil has a volume of 0.33 ft3 and weighs 42.55 lb. The oven-dried weigth of the soil is 35.56 lb. If Gs = 2.63, what is the void ratio of the soil
If a company wants to have $100,000 in a contingency fund 10 years from now, the amount the company must deposit each year in years 1 through 5, at an interest rate of 10% per year, is
(a) Use differentiation to find a general expression for the rocket's velocity as a function of time, (b) When is the velocity zero?
A level is set up midway between two wood stakes that are about 300 feet apart. The rod reading on Stake A is 9.65 ft and the reading on stake B is 4.23 ft. The level is then set up 6 feet in front of stake B.
a cylinder has 500 cm3 of water. after a mass of 100 grams of sand is poured into the cylinder and all air bubbles are removoed by a vacuum pump, the water level rises to 537.5 cm3. Dteremine the specific gravity on the sand
To float a 160 pound man using helium balloons (assume 0.52 cubic feet per inflated balloon). How many balloons would it take? Assume density of air is 1.29 kg/cubic meter and the density of helium is 0.179 kg/cubic meter.
determine the preassure in psi at a depth of 20 ft below the free surface of a body of water and find the absolute pressure when the barometer reads 29.9 inches of mercury.
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