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a) Compare the relative contributions of a treated water supply and the collection, treatment and disposal of human wastes towards the control of epidemic diseases in developing countries. If there are insufficient resources for both systems, should one be given priority over the other? Explain.
b) During an epidemic of contagious diseases, why doesn't everybody get infected?
c) Why are viruses difficult to remove from a water supply system?
d) List at least five of the main factors affecting the health of the community.
e) What are the differences between airborne infectious diseases and diseases that are caused by air pollution? Give at least two examples for each category of diseases.
a 2000 m long commercial steel pipe of 200 m diameter converys water at 20 C between two reserviors. the difference in water level between the reserviors is maintained at 50 m.
how do the crack behaves under the compression of a concrete cubes under friction between the plates and specimen with stress strain diagram?
How much (in addition to your trade-in value) can you afford to spend for a car averaging 30 mpg You expect to drive 15,000 mile/year and expect gasoline to cost $4.00/gallon and you will keep he car 10 years. Your personal interest rate is 6%/yea..
A cylindrical specimen of soil is compressed by an axial principal stress of 500 kPa and a radial principal stress of 200 kPa. Plot Mohr's circle of stress and determine (a) the maximum shear stress
Assume the stream is 3ft wide and 1ft deep (assume a rectangular cross section. If the flow throught the stream is 1000 gallons/day and the concentration at the beginning of the stream is 250 ppm
Given that the gate is 3 m wide and will just start to open when water height reaches 6 m, determine the weight of the gate.
A water jet of diameter 2 inches and speed of v=60 ft/s is filling a tank at a 70 degree angle. The tank has a mass of 25 lbm and contains 6 gallons of water. The water temperature is 70 degrees F.
Oil of a specific gravity of 0.75 is flowing through a 6-in pipe under a pressure of 15 psi. If the total energy relative to the datumplate is 8.0 ft below the center of the pipe is 58.6 ft, determine the flow rate of the oil.
A POTW (a.k.a. waste water plant) 1.0 m^3/s of treated effluent having an ultimate BOD of 30mg/L and DO = 2 mg/L into a stream that has a flow of 8 m^3/s, a BOD = 5.0 mg/L and DO = 9 mg/L.
A piston cylinder is initially at a state of 60c, 200kpa. Heat is added to the system from 500c reservoir until the final pressure is 400kpa. the mass of the air is 2kg, the spring constant is 1000kn/m and the cross sectional area of the piston is..
The water table is lowered from a depth of 10' to a depth of 20' in a deposit of silt. All the silt is saturated, even after the water table is lowered. The silt's water content is 26%.
A large company in the communication and publishing industry has quantified the relationship between the price of one of itsproducts and the demand for this product as Price = 150- 0.01 x Demand for an annual printing of this particular product.
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