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If a new piece of equipment costs $40,000.00 to purchase and it has a benfit of $500 per day. How many days per year does the equipment need to be used in order to be worth purchasing (breaking even)? The lifetime of the equipment is 10 years and assuming 10% annual interest?
n=10 i =10% initial cost =$40,000 benefit = $500 per day.
An equal-tangent crest curve connects a +2% initial grade with a -1% final grade, and is designed for 55mi/h. The station of the PVI is 233 + 40 with elevation 1203 ft. What is the elevation of the curve at station 234+00
A wastewater treatment plant has a flow of 35,000 m3/day. Calculate the mass of sludge wasted each day (QwXw, expressed in kg/day) for an activated-sludge system operated at a solids retention time (SRT) of 5 days
How long can the turbines produce 380.0 MW of power from the release of the mass of stored water calculated above? Assume the water sustains a friction loss of 39.5 m2/s2 on the way down to the turbine.
The air above the liquid is under a pressure of 5 psig, and the specific gravity of the liquid in the tank is 0.80. If the rectangular gate is 6 ft wide and if y1 = 1 ft and y2 = 10 ft, what force P is required to hold the gate in place
In 2006, the united states emitted 6,000 million metric tons (Mt) of CO2, 26.6 MtCH4, and 1.2 MtN2O. using 100 year global warming potentials, whats is the equivalent CO2 emission rate of the total for these three gases, in GtC-eq/yr
You are in charge of evaluating the safety (hazard) of a low water crossing. Traffic surveys show that the "Aaverage"vehicle using the crossing is semi-rectangular in shape (10 ft long, 5 ft wide, and 4.0 ft high - not including the distance from the..
Find the derivative of the equations f(x)=cos(x) using the finite differencing methods and compare the error with the actual answer as a function of x in matlab
At normal atmospheric conditions, approximately what pressure in psi must be applied to water 70 F to reduce its volume by 2 %
The phone lines to an airline reservation system are occupied 40% of the time. assume that the events that the lines are occupied on successive calls are independent. assume that 20 calls are placed to the airline.
You are assigned the task of using bioremediation to cleanup a hazardous waste site contaminated with Tetrachloroethylene. The site is a shallow surficial sandy aquifer 30 feet deep underlain by a clay unit. The depth to the watertable is 10ft.
One milligram per liter of hypochlorous acid (HOCl) is added to water to achieve disinfection of pathogenic bacteria. The disinfection potential of HOCl is 10 times greater than that of hypochlorite (OCl-).
a 25-ft long crane supported at its lower end by a pin is elevated by a horizontal cable as shown in the figure. a
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