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An emission control system for a new car costs $800 and reduces NO_x emissions from 0.4 g/mile to 0.23 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.
What is the annualized cost of this system in dollars per year if the discount rate (interest rate) is 5% per year?What is the cost per 100 miles driven?What is the cost per metric ton of NOx removed?
A waste water treatment plant previously used two circular clarifiers for primary settling, each 42 ft in diameter and 12 feet deep. Assume the incoming flow rate was 0.9 MGD. The maximum allowable clarifier loading rate is 600 gal/d/ft^2
calculate the alkalinity as CaC03 of water that contains 85mg/l of HCO3, 120 mg/l of CO3 and 2 m/l of OH.
Water occupies the bottom 0.8 m of a cylindrical tank.On top of the water is 0.3 m of kerosene, which is open to the atmosphere. If the temperature is 20 degrees C, what is the gage pressureat the bottom of the tank
If the length of the river connection between the two lakes is equal to 3km and the velocity in the river is equal to 0.4 m/s, determine the concentration of UBOD in the effluent from the second lake.
the pin at B is attached to member ABC and can slide freely along the slot cut in the fixed plate. Neglecting the effect of friction, determine the couple M required to hold the system in equilibrium when.
The magnetic declination of 1986 was 5 degrees 15 minutes. The magnetic bearing of a line was N 89 degrees 49 minutes W. At todays present the magnetic bearing of a line is S 88 degrees 20 minutes W.
One of the wells pumps at a rate of 1,240 m^3/ day. The second well pumps at 850 m^3 / day. If the aquifer has a T= 2000m^2 / day and a storage coefficient of 0.0004, when would the wells start interfering each other
Water is pumped at a rate of 1.57 cfs from one large open tank into another through a 6 in diameter cast iron pipe 400 ft long. The water level in the second tank is 160 ft above the level of the first tank and the discharge end of the pipe is sub..
A typical propane tank that we use for barbeque initially contains a pressure of 10 psi. The pressure is low, so we take it to the local store to fill the tank with more propane. After filling,the pressure is 100 psi.
what is the uniform deterministic arrival rate if the vehicle queue is cleared in 35 minutes after vehicles begin to arrive (in veh/min.)?
Diameter of the hose and the nozzle are .25ft and .1ft respectively. If the pressure inside the hose is 60 psig and the flowrate is 1.2 ft^3/s, calculate the horizontal force required to hold the hose in place.
a circular steel tube of length L=1.2m is loaded in torsion. If the inner radius of the tube is 45 mm and the measured angle of twist between the ends is 0.4 degrees, what is the shear strain at the inner surface
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