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Plate Creek carries 5.0 m 3/s of water with a selenium (Se) concentration of 0.0015 mg/L. A farmer starts withdrawing 1.0 m3/s of the creek water to irrigate the land. During irrigation, the water picks up selenium from the salts in the soil. One-half of the irrigation water is lost to the ground and plants, and the other half is returned to Plate Creek through runoff from the fields. The irrigation run-off to the creek contains 1.0 mg/L Se. Selenium is a conservative, non-reactive substance (it does not degrade in the stream), and the stream does not pick up more selenium from any other source.
a.) If the farmer irrigates continuously, what will be the steady state concentration of selenium in the stream downstream from the farm (after the irrigation run-off returns to the stream)?
b.) Fish are sensitive to selenium levels over .04 mg/L. The farmer agrees not to use more water than will keep the stream selenium level below this critical concentration. How much water can the farmer withdraw from the stream to use for irrigation?
When filled to capacity, avertical cylindrical un-pressurized storage tank contains water to a height of 14.5m above its base. Given that the height of the tankis 15m, the diameter 9m and wall thickness 18mm
1.For an SO2 emission rate of 22,000 kg/day and an exhaust gas flow rate of 5.0 million m^3/hour(after the scrubber) measured at 150 C and 1atm pressure, calculate the concentration of SO2 in the exhaust gases(ppm).
A 25-mm diamenter shaft is pulled through a cylindrical bearing. The lubricant that fills the 0.3-mm gap between the shaft and bearing is an oil having a kinematic velocity of 8.0x10^-4 m^2/s and a specific gravity of 0.91.
A 1.00 mol sample of an ideal gas (gamma = 1.40) is carried through the Carnot cycle. At point A, the pressure is 25.0 atm and the temperature is 600 K. At point C, the pressure is 1.00 atm and the temperature is 400 K.
The industrial discharges to the municipal sewers are 57 m3/day at 1,800 mg/L BOD from a slaughterhouse and 70 m3/day containing 32 kg of BOD from a soup-canning plant.
A driver with his passenger vehicle is driving at 35 mph, when the traffic signal in front of him changes to yellow. He is 100 feet from the intersection when he applies the brakes after a 1-second reaction time.
A disk is made of material having a SG = 8.3 and is 500 in diameter and a thickness of 10mm. Find the a) weight and b) mass of the disk in US and SI units.
He is concerned about the high rolling resistance of the units in the sand (RR factor 250lb/ton). What is the rolling resistance?
Deisgn a thrust block needed to resist the force generated by a 45 degree flanged regular elbow which carries a flow of 14 cfs. The diameter of the fitting narrows from 24 inches to 18 inches and the inlet pressure is 100 psi.
A 6-lane freeway horiz. alignment has a 1200' C.L. radius going into a tangent and then a reversing 1800' radius. How much tangent distance between the two curves is needed to meet the superelevation runoff requirements
Suppose that 0.03% of plastic containers manufactured by a certain process have small holes that render them unfit for use. Let X represent the number of containers in a random sample on 10000 that have this defect.
Compute the corrected horizontal distance for the following conditions: Temperature: 25oC Tape length: 29.990m Slope angle: -3o42' Slope measurement: 211.416m
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