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The maximum eight-hour average concentration of carbon monoxide (CO) in an urban area is measured to be 17 ppm. The NAAQS is 9 ppmv (equivalent to 10.3 mg/m^3 estimated at P = 1 atm and T=298.25°K). Automobile emissions are believed to be the only major source of CO; it is assumed there is no background contribution for other sources. Assume also that CO can be modeled as chemically non-reactive over the period of interest. Answer the following questions:
a. If the average wind speed is 3 m/s and the urban area has the dimension of 95 x 95 km with a mixing height of 500 m, what is the steady state emission rate (mg/m^2-s) of CO by the automobiles that would lead to the measured city air concentration of CO of 17 ppm?
b. How much of a reduction in the automobile emission rate would be required to achieve the maximum eight-hour average NAAQS for CO at steady state 9 ppmv ( (10.3 mg/m^3)?
The specific yield of an unconfined aquifer is Sy = 0.15. How much, on average, would the water table need to be lowered (in m) in an area of 2.5 km^2 to release 6.5 x 10^5 m^3 of water from storage in this aquifer
Write a MATLAB code that calculates the weight (forces due to gravity) in lbf on each planet of our solar system and earth's moon for probes/rovers which have a mass between 100 lbm and 300 lbm. Use increments of 20 lbm.
The drainage area upstream of a small dam is 20 acres. On a certainday the pond was 9 feet deep with a surface area of 1.6 acres. That night, a 5.4 inch rainstorm caused a large rise in the pond.
You arrive at your bus stop at some random point in the cycle, what is your expected wait time, w(t), to board a bus. Be sure to show your work or you will lose points. What is the standard deviation in w(t) given the fact that there is no bus wait..
Assume the microorganisms are 55 percent efficient at converting food to biomass, the organisms have a first-order death rate constant of 0.05/day, and the microbes reach half of their maximum growth rate when the BOD5 concentration is 10 mg/L
determine the nominal cross-sectional dimensions for a Douglas fir larch No. 1 grade beam of least weight that supports a total uniformly distributed load of 12 kip on a simple thirty-two foot span considering loading in shear
What is the terminal settling velocity of a particle with a specific gravity of 1.4 and a diameter of 0.01 mm in 20 degrees celcius water. What is the smallest diameter particle of specific gravity 1.4
How many hours should it take an articulated wheel loader equipped with a 4 yd bucket to load 3000 cu yd of gravel from a stockpike into rail cars
A rectangular unfinished concrete channel with wood forms is laid on a bottom slope of 0.0064 to carry a flow of 20m^3/s of water. Determine the width of the channel when the flow is in critical condition.
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. (b) the shear, thrust, and moment in the arch at point C.
Calculate carbonate, noncarbonate, and total hardness Na+ = 27.8 mg/L Cl- = 35.6 mg/L Ca+2 = 48mg/L CO3-2 = 30 mg/L Mg+2 = 12mg/L HCO3- = 61 mg/L K+ = 12 mg/L SO4-2 = 48 mg/L
A toxic compound being is removed from solution in a CSTR at Steady State according to a first order reaction rate. The upstream concentration of the pollutant is 14 mg/L and the downstream concentration is 1.7 mg/L.
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