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The company Eco-Safe is adding pollution control equipment to its process and reducing emission of pollutants. The annual waste disposal cost of the current process is $130,000 and the annual operating cost is $600,000. The annual waste disposal cost of the new process is $70,000 and the waste disposal cost is $400,000. The cost of changing the existing process to the new process is $350,000. Should the company proceed with the process change? Make your calculations on present worth basis and use 8 percent discount rate and five year life.
Radon from well water may pose a radiological health hazard. One treatment technique is simply to hold the water in storage, allowing the radon to decay. how large must each be to achieve the desired level of control.
A dam has a parabolic shape z/zo = (x/xo)2, with xo = 10 ft and zo = 24 ft. The fluid is water, gamma = 62.4 lbf/ft3, and atmospheric pressure may be omitted.
If = 300 N , determine the required minimum compression in the spring so that the wedge will not move to the right. Neglect the weight of A and B. The coefficient of static friction for all contacting surfaces is .2 Neglect friction at the rollers..
A 2.5 hr long uniform rainfall resulted in runoff hydrograph that has the shape of an equilateral triangle. The base of the triangle is 64 hr; the peak flow is 535 cfs; the drainage area is 5.7 mi^2.
Air enters a steady flow, adiabatic compressor at 17 °C and is compressed through a pressure ratio of 8.6: 1. Assuming the compressor to be internally reversible
A convective kerosene heater is tested in a well-mixed chamber having an air exchange rate of 0.39 ach. After 1 hour of operation, the NO concentration reached 4.7 ppm (remember PV=nRT).
1. Describe why materials such as aluminum, steel, basswood, and Polystyrene Plastic and structures are important in our everyday lives. 2.Write a paragraph to explain to a lay person a few of the important factors
An existing power plant has been found to produce SO2 concentration of 20µg/m3 at a distance of 800m directly downwind from the stack when the wind is 4m/s from the north during a class C stability situation.
What is the risk of constructing a harbor which will be unprotected from wave attack during its construction.
Sketch a streamline, pathline, and streakline, For a given flow the velocity from time t=0 to t=5s was u=2 m/s, v=0. Then from t=5s to t=10s the velocity was u=+3 m/s, v=-4 m/s. A dye streak was started at t=0
The mean grade on a final examination was 72, and the standard deviation was 9. The top 10% of the students are to receive A's. What is the minimum grade a student must get in order to receive an A
An enginnering student has just finished the freshman year and has received an offer of $20,000 per year in a full-time job, with prospects of salary increasing 3% per year until retirement after 33 years. If employement is taken, the student will li..
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