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1.A fan produces a pressurerise of 6mm of water to move air through a hair dryer. The mean velocity of the air at the exit is 10 m/s, and the exit diameter is 44 mm. Estimate the electrical power in watts that needs to be supplied to operate the fan. Assume that the fan/motor combination has an efficiency of 60%.
2.A small town produces 0.15 MGD of wastewater. How many acres in size would an aerated lagoon need to be to treat this wastewater assuming a depth of 8 ft. and a detention time of 6 days? (7.48 gal/ft^3 ; 43,560 ft^2/acre)
For a cement paste with an initial water-cement ratio of 0.5, by mass, calculate the mass and volumetric composition of 1 cm^3 of HCP under both wet and sealed curing conditions.
Constructing the foundation causes changes in the levels of vertical stress at all points in the soil. One such point lies at the centre of the footing plan and is at a depth of 10m. Determine the increment of vertical stress there.
assuming that the contaminant travels mainly by advection, propose any operational changes to the given layout to prevent the river from being contaminated.
. In order to get full credit for this problem you must list all unknown species that would exist in the raindrop and all pertinent equations regardless of their level of significance. You must algebraically solve the equations to determine pH.
The posItIon of a particle along a straight line is given by s = (t 3 - 9t 2 + 1St) ft, where t is in seconds. Determine its maximum acceleration and maximum velocity during the time interval 0 :5: t :5: 10 s.
A design for a hovercraft is made. A fan sends air in from the top of the rectangular chamber (60F) and is exhausted between skirts and the ground. Pressure in the chamber is responsible for lift, and the craft is 15 by 7 ft.
An absorption column is to be designed to recover 99.5% of the NH3 from a feed stream, which is supplied at 72 F and an NH3 partial pressure of 10 mm Hg. The feed stream contains 2100 lbm/hr of air.
A rectangular unfinished concrete channel with wood forms is laid on a bottom slope of 0.0064 to carry a flow of 20m^3/s of water. Determine the width of the channel when the flow is in critical condition.
Consider a state with a total water withdrawal of 4.5 bgd in 2000. This was distributed as follows: municipal use 1.0 bgd, industrial use 1.5 bgd, and steam electric cooling 2.0 bgd
Critical review the decision making of a failed major construction/property project within the UK in the last ten years.
Piezometer A is located 3000 feet due south of piezometer B. Piezometer C is located 2000 feet due west of piezometer B. The surface elevations of A, B and C are 480, 610 and 545 feet respectively. The depth to water in A is 40 feet, in B is 140 f..
A rectangular channel carries a discharge of 2.00 m3/sec per meter of channel width over a weir crest that is 1.4 m in height. The energy grade line upstream of the weir measure 2.7 m above the channel bottom
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