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An emission control system for a new car costs $750 and reduces NOx emissions from 0.4 g/mile to 0.18 g/mile. Assume the car is driven 10000 miles per year, and the life of the emissions control system is 11 years with zero scrap value.
a) What is the annualized cost of this system in dollars per year if the discount rate 6% (interest rate) is per year?
b) What is the cost per 100 miles driven?
c) What is the cost per metric ton of NOx removed?
A wastewater treatment plant receives 15 mgd of flow, with solids concentration of 230 mg/L. How many pounds of solids enter the plant every year
if the settling velocity of a particle is 2.8 mm/s and the overflow rate of an upflow clarifier is .56 cm/s what percent of the particles are retained in the clarifier
The entrance is square edged, and the elbows are 90o. There is a fully opened gate valve on the suction side and the discharge side, and there is a swing type check valve on the discharge side. Determine the system curve for the pump system.
A 175 Mi^2 watershed has a 4200 acre reservior within its boundary . The annual watershed runoff to the reservior is 13in. A flow of 120 mgd (368 ac-ft/day) is to be drafted from the reservior. The annual rainfall is 38in.
Describe a dynamic programming algorithm to find an independent set of T such that the sum of numbers of nodes in the set is the largest among all possible independent sets of T.
A ground level source is emitting pollution. An air sampler is located 1 km downwind and 0.5km crosswind of the source measures the concentration of the pollutant ant ground level as 10 micrograms/cubic meter.
For a car traveling 35 mph the distance required to brake for a stop is normally distributed with mean of 55 feet and standar deviation of 8 feet. You are traveling 35 mph in a residential area and a car moves abrupt into your path at a distance o..
A concrete test cylinder 200 mm in diameter by 400 mm high is tested to failure. The compressive strain at failure is 0.0012. Determine the total amount the cylinder shortens before failure.
State the full name of the section of SOLAS that sets out the minimum standards for the training and competence of crew members and describe how the surveyor would go about checking that a vessel had the necessary number of qualified staff.
What is work? Why is it path dependant? Derive the expression for reversible work from a closed system containing a simple compressible substance.
A soil sample with specific gravity of solids 2.70 has a mass specific gravity of 1.84 Assuming the soil to be perfectly dry,Determine the void ratio.
Light-Voice Controlling System. We are planning to design a new light-voice controlling system. The voices will basically coordinate the crossing of a road by blind people. Suppose the crossing will be operated by two coordinated systems
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