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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?
Determine the design load for strength and serviceability limit states (short-term and long term), for a steel beam in a residential building with the following data;
A rectangular tank 2.0m wide, 4m long, and 2m deep contains water to a depth of 1.0m It is accelerated horizontally at 3m/s^2 in the x direction.
It is known that the velocity distribution for steady, laminar flowin circular tubes (either horizontal od vertical) isparabolic. Consider a 10 -mm- diameter horizontal tubethrough with ethyl alcohol is flowing with a steady mean velocity.15 m/s.
Two control points A "station" (1000E, 1000N) and B "backsight" (594.22E, 877.68N) are available within the area. Indicate the procedure to satisfy the orientation and calculate the required total station reading towards B.
Explain how the stregth of the economy as a whole could affect the marginal benefits and the marginal costs associated with a decision to purchase a home.
The probability density function, f(t), of the time in hours between storms during the summer in Miami is estimated as f(t) = .014e^(-.014t) if x > 0, f(t) = 0 if x is less than or equal to 0 where t is the time interval between storms in hours.
For unidirectional carbon/epoxy tape at a 60% fiber volume fraction, calculate E11 and E22. Given Ef= 211 GPa and Em =10 GPa. Calculate the fiber weight fraction. Given pf=1.95 g/cm3 and pm =1.3 g/cm3.
An emf of 22.0 mV is induced in a495 turn coil when the current is changingat a rate of 5.0 A/s. What is the magneticflux through each turn of the coil at an instant when the currentis 1.00 A
Water flows past a triangular flat plate oriented parallel to the free stream as shown. Integrate the wall shear stress over the plate to determine the friction drag on one side of the plate. Assume laminar boundary layer flow.
Model tests are to be performed to study the flow through a large check valve having an inlet diameter of 2 feet and a volume flowrate Qp of 30 cfs. The working fluid in the model is water at the same temperature as that in the prototype.
A tank is divided into two equal chambers by an internal diaphragm. One chamber containes methane at a pressure of 500 bar and a temperature of 20 C, and the other chamber is evacuated.
A dam project specifies 97% compaction. Lab tests on the soil being used indicate that it has a maximum dry density of 1900 kg/m 3 at an optimum water content of 13.2%.
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