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1. The maximum eight-hour average concentration of carbon monoxide (CO) in an urban area is measured to be 15 ppm. The NAAQS is 9 ppmv (equivalent to 10.3 mg/m3 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 3m/s and the urban area has the dimension of 100 x 100 km with a mixing height of 500m, what is the steady state emission rate (mg/m2-s) of CO by the automobiles that would lead to the measured city air concentration of CO of 15 ppmv?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 9ppmv (10.3 mg/m3)?
A 12kw (shaft output) motor is available to run a non-cooled compresor for helium. The pressure is to be increaded from 80 kPa to 120 kPa. If the compressor is 70% efficent, calculate the volume flow rate into the compressor.
You try to freeze one liter of water at 10 degrees Celsius in ice trays in your freezer. Your freezer has a coefficient of performance of 5.5 and a power rating of 550 Watts, though only 10% of the power will go into freezing the ice.
Determine the force in each member of the truss and state if it is in tension or compression. Set P=400 lb and d=4 ft.
A groundwater is contaminated with methyl tertiary butyl ether (MTBE) at a concentration of 20 mg/L.the groundwater will be treated with an advanced oxidation process that involves formation of hdyroxyl free radical (OH*).
Plot the ground level concentration of sulfur dioxide as a function of distance from the stack and determine the maximum ground level concentration at both with and without air pollution control and the distance from the stack where the maximum co..
Estimate the diameter of the tower, based on bottom operating conditions. Assume that the density and viscosity of the bottom liquid are the same as tose for pure water. Make other appropriate assumptions as needed.
The 500- bed Lotta Hart Hospital has a small activated sludge plant to treat its wastewater. The average daily hospital discharge is 1200 L/day per bed, and the average soluble BOD5 after primary settling is 500 mg/L.
What is the density in kg/m3 of: (a) dry air at 25 degrees C and a pressure of 1,000 millibars; (b) moist air with a relative humidity of 80% at the same temperature and pressure
A truck is hauling a 300-kg log out of a ditch (20 degree incline) using a winch attached to the back of the truck. Knowing the winch applies a constant force of 2500N and the coefficient of kinetic friction between the ground and the log is 0.45
a saturated 100 cm^3 clay sample has a natural water content of 30 percent. it is found that the shrinkage limit occurs when the water content is 19 percent. if the specific gravity of soil solids is 2.70
What is the dry unit weight, the saturated unit weight, and the buoyant unit weight, of a soil having a ratio of 0.5 and a value of Gs of 2.7
the path of particle p ios the elipse difined by relations r=2/(2-cosPIEt) and theta=PIEt, where r is exspressed in meters , tis in seconds nd thet is in radians. Determine the velocity and the acceleration of the particle whern t=0 seconds
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