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The City of Leadville (dimensions 120x120km ) is characterized by an average daily emission rate of 5000kg/d of particulate lead into the atmosphere from auto exhaust and industrial processes. The background concentration of atmospheric lead is 0.1 ug/m^3. During a typical hot day in Leadville the mixing height is 500m and the average wind speed is 1.9m/s. A typical lead particle deposition flux,Jd , for similar meteorological conditions is 0.05cm/s .
a)What is the steady-state concentration of lead in the urban air?
(Hint: note that the mass flow rate of Pb Particles from the air and to the earth (mass of Pb deposited/time) is given by Qd x C, where ,Qd=Jd x A, C is the concentration of lead in the air above the city, and A is the surface area of the city)
A 12 foot W14 X 22 column with pinned ends is axially loaded. The max load it can carry is 34 ksi. Determine (a) Euler buckling stress, (b) Euler buckling load. (A = 6.49 in^2) (ry = 1.04 in) (Iy = 7.00 in^4)
A 3-mm thick panel (1 m x 1 m) of aluminum alloy (k = 177 W/m. K, Cp = 875 J/kg. K, and p(rho)= 2770 kg/m3) is heated in a large oven with air at T = 175oC and a convective heat transfer coefficient of h = 40 W/m2.K.
A 3-mi section of a two-lane, two-way highway located in a mountainous terrain is to be designed to carry a peak hour volume of 750 vehicles. Using the operational level of analysis
Four pumps are to be used in 0.5-m diameter wells at the four corners of the site. Determine the required pumping rate. The aquifer has T = 1600 m^2/day and the wells each have a radius of influence of 600 m.
A normally consolidated clay layer in the field has a thickness of 3.2 m with an average effective stress of 70 kN/m^2. A laboratory consolidation test on the clay gave the following results: Pressure (kN/m^2)=100, 200 Void Ratio=0.905, 0.815
A 1 m diameter unfinished concrete pipe (n = 0.015) has a slope of So = 0.001 and conveys water at Q = 0.5 m3/s. Find the normal depth yo and critical depth yc.
A motor grader will require 2 pases at 3 mph., 2 pases at 4 mph., and 2 passes at 5.5 mph. to accomplish the work How many grder hours will be required to accomplish this job if the job efficiency factor is 0.75.
The number of hours on each machine required to produce a product is given in the following table, along with the number of hours available per week on each type of machine. Assume that the company can sell everything it produces.
Carnot engine working between a source temperature of T2 and sink temperature of T1 has efficiency of 25%. if the sink temperature is reduced by 20 degrees Celsius the efficiency is increased to 30%. find the source and sink temperature
a low rate trickling filter plant gives 95% BOD5 removal. the primary clarifier removes 33% of the BOD5 applied to it. the secondary sludge amounts to 0.029lb dry solid/cap-day. if the raw wastewater has a BOD5 of 0.17lb/cap-day.
Draw the FBD and the shear and bending moment diagrams. Label all minimums, maximums and zero crossing points as well as the slopes as constant, linear or parabolic.
(a) Calculate the annual costs ($/yr) of meeting the proposed effluent requirement of 0.1 mg P/L using alum to precipitate AlPO4(s). Assume the chemical formula for alum is Al2(SO4)3·18H2O (MW = 666).
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