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A new sponge iron factory has an annual capacity of 100,000 tons/year of Iron production. Benzopyrene is produced during this process at a rate of 0.00006% of Iron produced. Due to high temperatures, 0.0003% Benzopyrene goes into the air. The space volume where iron smelting occurs is 100 m x 70 m x 7 m.
(a) The natural air flow rate to this industrial shade structure is 90 m3/hour. Determine the risk to the workers who work 8 hours/day, 50 weeks/year for 30 years. Assume workers are 75 kg and live for 70 years.
(b) What flow rate do you need to reduce the risk by 95%?
A circular bar of magnesiuen alloy is 750 mm long. The bar is loaded in tension to an elongation of 6.0 mm, and the load is removed. (a) what is the permanent set of the bar (b) if the bar is reloaded, what is the proportional limit
Suppose a drainage basin has an area of 288 acres with a CN=55(Runoff Coef. of 0.30). Determine the peak discharge (in cfs) that would result from a 6.0in., 24-hr assuming there are no ponds and swampy areas.
Due to a crash at a railroad crossing, an overpass is to be constructed on an existing level highway. the existing highway has a design speed of 50 mi/h.
Primary treatment removes ~25 percent of the BOD. Calculate the volume (m3) and approximate hydraulic retention time (h) of the aeration basin required to run the plant as a "high rate" facility (F/M = 2 kg BOD/kg MLSS-day).
Using a design speed of 50 mi/h, determine the stations and elevations of PVCs, PVIs, and PVTs of the two vertical curves required to connect the highway segments, as well as the length of the constant grade section (connecting grade is to be as s..
An equal-tangent crest curve connects a +2% initial grade with a -1% final grade, and is designed for 55 mi/h. The station of the PVI is 233 + 40 with elevation 1203 ft.
A runs slope a distance of 156.777 m from one point to another point at a rate of +1.5%. What is the corresponding horizontal distance between the points?
The force is applied at the two pins. The pins allow rotation around the z-axis and do not allow rotation around the y-axis. The length of the beam between the pins is 8m. Determine the maximum allowable compressive force that can be applied.
Calculate the work necessary to compress air in an isolated cylinder from a volume of 6 ft^3 to a volume of 1.2 ft^3. The initial pressure and temperature are 30.0 psia and 50 degree F, respectively.
At what depth will 400 cfs flow uniformly in an earth lined (n = 0.025) trapezoidal canal of base width 15 ft having side slopes 1 on 3 if the canal is laid on a slope of 1 in 10,000.
If the ultimate BOD of the mixed river water is 30mg/L, the rate constant for BOD at 20ºC is 0.6d-1, the reaeration rate constant at 20ºC is 0.8d-1, and the removal of BOD by sedimentation can be neglected
At the reference temperature, three identical rods of length L form a pin jointed truss in the shape of an equilateral triangle, ABC. Determine the angle theta as a function of delta T, the temperature increase of the rod AB.
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