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If biodegradable organic matter, oxygen, and microorganisms are placed in a closed bottle, the microorganisms will use the oxygen in the process of oxidizing the organic matter. The bottle may be treated as a batch reactor (no inflows or outflows), and the decay of oxygen may be treated as a first order reaction. write general mass balance equation for the bottle.Calculate and then plot the concentration of oxygen each day for a period of 5 days starting with a concentration of 8 mg/L. Use a rate constant of 0.35 d-1.
Given s=.30/(60-u), where s is the spacing (space headway) in miles, and u is the speed in miles per hour, derive the relationships u-k, u-q, and q-k. Also, estmate the capacity (qmax) of the roadway.
Natural gas is stored in a spherical tank at a temp. of10oC. At a given initial time, the pressure in thetank is 100 kPa gage, and the atmospheric pressure is 100 kPaabsolute
Link ABrotates through a limited range of angle β, and its end Acauses the slotted link ACto rotate also. For the instant represented where β= 60 and = 0.6 rad/sconstant, determine the corresponding value of r r'.
Calculate the length and diameter of the reaction zone of an afterburner that treats 2000 acfm of polluted air (measured at 250 F). The gases in the after burner are at a temperature of 1400 F for a residence time of 0.50 sec.
A 0.4m^3 moist soil sample has the following: Moist mass = 711.2 kg, Dry mass 623.9 kg, Specific gravity of soil solids = 2.68 Estimate: a). Moisture content. b). Moist density.
A nearly horizontal, 12 ft wide rectangular channel carries 60 cfs at a depth of 3 ft. the width of the channel is smoothly contracted to 6 ft at the downstream section. (a) determine if the flow will choke and both the downstream and upstream water ..
Two factories are manufacturing and supplying a single type of good to four warehouses. The factories can produce a1, and a2 units of the good each month, and the warehouses need b1, b2, b3, and b4 units each month
Air enters an electrical furnace at 20oC, 100 kPa, with a volumetric flow rate of 30 m3/min. The furnace delivers air at 40oC to a duct system with three branches consisting of two 15-cm-diameter ducts and a 30-cm-diameter duct.
An overpass is being built over the PVI of an existing equal tangent sag curve. The sag curve has a 70 mi/h design speed, and G1 = -6%, G2 = +3%.
A paper plant is proposed for a location 1 km upwind from a town. It will emit 40 g/s of hydrogen sulfide, which has an odor threshold of about 0.1 mg/m 3. Winds at the effective stack are typically 4 m/s blowing toward the town.
A point charge of -2.00μC is locatedin the center of a spherical cavity of radius 6.51cm inside aninsulating spherical charged solid. The charge density in the solid7.34*10^-4 C/m^3.
A cylinder of rock with a Poisson's ratio of 0.422 has ano-load length equal to 17.6 cm and a no-load diameter of 6.20cm. Under an axial compressive load the axial strain is foundto be -3.44 mm/m.
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