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Fresh water is to be obtained from brackish water at 65°F with a salinity of 0.12 percent on mass basis (or TDS = 1200 ppm). Determine (a) the mole fractions of the water and the salts in the brackish water, (b) the minimum work input required to separate 1 lbm of brackish water completely into pure water and pure salts, and (c) the minimum work input required to obtain 1 lbm of fresh water.
For the following waste and river characteristics just upstream from the outfall, find the minimum downstream DO that could be expected
A manometer is used to measure the pressure difference between points A and B in a pipe. Water flows in the pipe, and the specific gravity of the manometer fluid is 2.8. The distances and manometer deflection are indicated.
The measurements of the nominal shear strength (in kN) for a sample of 15 prestressed concrete beams are as follows: 580 400 428 825 850 875 920 550 575 750 636 360 590 735 950
A 900-mm strip of steel is bent into a full circle by two couples applied. Determine (a) the maximum thickness t of the strip if the allowable stress of the steel is 420 MPa, (b) the corresponding moment M of the couples.
A pre-sedimentation basin has been designed that reduces the river water suspended solids concentration from 500 to 200 mg/L. How many pounds of dry solids does this represent per million gallons of treated water
The design of a masonry wall to support vertical compression loading is influenced by the same factors that affect the design of all compression elements. One of these factors is the extent of rotational restraint at the top of the wall.
An open system Brayton cycle has a heat input of 500 kW. The pressure ratio of is 15 and the mass flow rate of air through the engine is 1 kg/s. Right before compression the temperature of the air is 273K and the pressure is 70 kPa.
A rectangular column of size 16” x 16” is to be designed for the following loads. Service D.L = 150 kips ft, Service LL = 200 kips-ft. DL Moment = 80 ft- kips, LL Moment =130 ft kips. Find the required column reinforcement.
Three loads are applied to a beam. the beam is supported by a roller at A and by a pin at B. neglecting the weight of the beam, determine the reaction at A and B when P=15kips.
The filters in the plant are 8.0x8.0m surface area and operate on the following schedule. A filter is cleaned once in each 24-hr period, and a backwash rate is 10.0 L*m^-2*s^-1 fora period of 8 min.
A semiautomated system has been developed as an alternative. The costs for the proposed method are $40,000 for equipment and $1.00 per manufacturing cost per unit. What is the break-even number of units per year
Define the term stocky wall Define the term simple bearing.
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