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Write the mass balance equation for an ideal 1D plug-flow stream under steady state conditions with a first-order decaying substance. Solve for the concentration as a function of the concentration x=0, the rate constant kd, longitudinal distance x, and mean velocity u. Assume the rate constant for BOD decay is 0.2 d^-1, the mean velocity of the stream is 0.5 m s^-1, and the initial concentration is 100 mg L^-1 at x=0. Plot the resulting concentration with downstream distance x in km.
compute the max possible moment at the centerline of the beam and the absolute moment in the beam.
A floor system consists of wide flange steel beams (W18 x 60) equally spaced at 8ft center to center. A 6inch reinforced concrete slab spans between beams. The bottom of the slab is coated with plaster and the top of the slab has ¾inch hardwood fl..
What is the cost breakdown structure(CBS)? What are its purposes? What is included (or excluded)? How does it relate to a work breakdown structure (WBS)?
Calculate the tensile modulus of elasticity for a 10 laminated composite consisting of 62 percent by volume of unidirectional carbon fibers and an epoxy matrix under isostress conditions.
Assume that you borrow $10,000 for five years (annual payments) at a market rate of 5%. Assuming that inflation is 3.5%, what would the equivalent equal monthly payment be in constant dollars
A geothermal power uses hot water (185oF) as a heat source and the cold water from a close by lake (60oF) as a heat sink. The basic operating system is a close loop ammonia efficiency of the cycle that powers turbine-driven electric generator (100..
The total dissolved inorganic carbon (TIC) of a sample of groundwater is 8.33 mM. The temperature of the aquifer is 15C, the pH is 7.5, and the ionic strength is 0.05 M. What is the H2CO3, HCO3-, CO3 2-, and the partial pressure of CO2? [Use activ..
Calculate the equilibrium concentration of dissolved oxygen in 15oC water at 1 atm, and again at 2000 m elevation.
a tank is filled with oil (specific gravity 0.8) and water to a depth of 10 meter and 6 meter respectively. Find the resultant force from all fluids acting on the gate of 1.8 meter by 9 meter.
The condenser in a refrigerator receives R-134a at 700 kPa and 50C, and it exits as saturated liquid at 25 C, The flow rate is 0.1 kg/s,and the condenser has air in at an ambient temperature of 15 C and leaving at 35 C. Find the minimum flow rate ..
Create a precedence (activity-on-node) diagram based off the attached activity list. You must follow the below recommendations as we discussed in class. 1) draw nodes as rectangles. It helps define the left side as starting and the right side as en..
The jib crane supports a load of 750 lb from the trolley which rides on the top of the jib. The members of the crane are pinned together at B, E, and F and supported by a short link BH.
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