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The United States Environmental Protection Agency (EPA) has published the following data for municipal solid waste generation (in millions of tons).
Year: 1960 1965 1970 1975 1980 1985 1990 1995 2000
MSW: 88 104 121 128 152 166 205 221 249
a) Assume that the growth is exponential (i.e., plot the log of generation versus time) and calculate a value for the annual growth rate (% / yr).
b) If the annual rate of population growth is 1.8%, calculate a value of the annual rate of growth in per capita generation of solid waste.
c) Estimate a value of MSW generation in the year 2025.
d) Suggest one method that might be used to decrease the rate of growth in per capita generation rate
Calculate the resistance coefficient K for a ball-type check valve placed in a 2-in schedule 40 steel pipe carrying 650 gal/min of oil (sg = 0.90)
A stream is in equilibrium with atmospheric oxygen upstream of a waste outfall. The waste outfall creates a BODo of 20 mg/L in the stream. The k(BOD) is 0.4 /day and the k(o2) is 1.4 / day. The stream temperature is 15 degrees Celsius.
On a 20 ft cantilever beam, Load W1=200 or W2=500 or both may be applied at the midpoint B or at the end of the beam C. The bending moment induced at th fixed support A, MA, will depend on the magnitude of the loads at B and C.
Using darcy-weisbach equation, calculate the major friction head loss for a 24 inch diameter, 120 ft long pipe that can carry water with a flow rate of 5 cfs. Assume the temperature of water is 70 deg F and the roughness of the pipe is 0.0016 ft.
The diameter of the soil column is 8.0 cm, the length of the soil column is 16.0 cm. The hydraulic head loss across the soil specimen is 6.4 cm. Over a period of 3 min, 350 mL of water is collected at the downstream side of the soil specimen.
a= -10 (1/sec^2 ) x where x is the displacement of the mass in meters. If the initial position is -1 m and the initial velocity is +1 m/sec, find: (i) the velocity when x = 0 for the first time and (ii) the maximum and minimum values of x.
what is the engineering ethics case related to civil engineering with reference and discuss all the engineering ethics issues which covered the "Engineering etics concepte and cases?
Find the swell for a soil which weighs 1600kg/m in bank and 1300kg/m3 in bank and 1300kg/m3 Loose and what is the shrinkage factor for a mass of soil that takes up 1.5m3 in bank and reduces down to 1.2m3 after compaction
It accelerates wibt constant tangential accleration of at= 0.75 m/s^2. Determine the distance traveled and the time elasped when the magnitude of the car's totale acceleration is 0.9 m/s^2.
A moist soil sample weighing 22.2 N has a moisture content of 20%. How man N of water must be added to the sample to increase the moisture content to 30%
Offshore oil exploration platform is expected to encounter current of 3 m/s wave height 4 m and periods 15 seconds. A 1 in 20 scale modes is to be build and tested in hydraulic laboratory to determine the forces on the full scale structure.
THe 50 kg crate is stationary when the force P is applied. Determine the resulting acceleration of the crate if (a) P=0, (b) P=150 N, and (c) P=300 N
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