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Determine the masses of dry air and the water vapor contained in a 240-m3 room at 98 kPa, 23°C, and 50 percent relative humidity.
An electric power plant consumes 2.5 million gallons per day of cooling water. To control bacterial growth (slime), 2.0 mg/L of chlorine (measured as Cl2) is injected into the make-up water fed to the system.
The elevator of a large building is to raise a net mass of 400 kg at a constant speed of 12 m/s using an electric motor. Minimum power rating of the motor should be
A quality characteristic is monitored by a control chart designed so the probability that a certain out-of-control condition will be detected on the first sample following the shift to that state is 1-beta.
How much total money do you expect if oil stays at $95 per barrel? 6. How much total money do you expect if oil stays at $30 per barrel? What will be your average monthly royalty check at $95 per barrel?
Aluminum ion (Al3+) is present in an industrial wastewater at 3 mg/L. The treatment facility wants to precipitate out the aluminum until there is only 0.2 mg/L remaining. What pH is required to acheive this aluminum ion concentration
A series of Standard Proctor compaction tests was performed on a soil with a specific gravity of 2.68 with the following results: Determine: Maximum dry density; Optimum moisture content
Design a 2:1 rectangular duct and fan system to pull 40000 scfm of air carrying a medium-density dust through an FCD (Final Control Device) with a ?P of 6.0 in. H2O. Assume the duct system must extend 120-feet and has four 90° elbows.
Determine the value of Po, as a funciton of H, for these two investment alternatives to be equivalent at an interest rate of i=15% per year.
A cylindrical specimen of stainless steel having a diameter of 12.8 mm and a gauge length of 50.8 mm is pulled in tension. In the linear elastic region, a stress of 400 MPa corresponds to a strain of 0.002. Furthermore, the 0.002 strain offset li..
Determine the aeration period, F/M ratio, solids concentration in the return sludge, return sludge rate, sludge age, and sludge wastage flow rate.
A temporary diversion has been constructed on a highway of +4 percent gradient due to major repairs that are being undertaken on a bridge. The maximum speed allowed on the diversion is 10 mph.
A horizontal Curve is designed for a two lane mountainous terrain. The following data are known. intersection angle: 40 degrees tangent length: 436.76 ft Station on PI: 2700+10.65 fs=0.12 e=0.08
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