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Environmental engineers and scientists are becoming concerned about pharmaceuticals in the environment. An antibiotic is discharged into a small lake at an influent concentration of 0.05 mg/L. The lake has a surface area of 2 acres and a mean depth of 6 feet. The flow into the river is 200 cubic feet per second (cfs). The antibiotic is degraded naturally in the lake with a first-order rate constant of 0.002 s
A. What kind of hydrodynamic model should you use for a small lake?B. Write the mass balance equation in words.C. Write the mass balance equation for the antibiotic in symbols at steady state. Define your symbols.D. What is the antibiotic concentration in a river draining the lake at steady state?
It is desired to produce an iron-carbon allow that has a minimum hardness of 200 HB and a minimum ductility of 35% RA. Is such an ally possible. If so what its composition and microstructure
Assume that you are going to buy a car work $25,000. You will be able to make a down payment of $3,000. The remaining #22,000 will be financed by the dealer. The dealer computes your monthly payment to be $547.47 for 28 months of financing.
The ball is kicked so that it has a velocity of 0.5 m/s and the cord is pulled in at a rate of 0.2 m/s. Neglect friction so that the only important force on the ball is the tension in the cord. Find the tension in the cord when the radius is 0.25 ..
Determine the vertical deflection in inches at the midpoint, called point F, between points B and C. Use E=29,000 Ksi, I=800 inches^4, and A=6.0 inches^2 for all members. Use the Virtual Work Method.
The air pressure is 120 KPa, the air temperatuer is 28 degrees C, and the dew point is 20 degrees C. Calculate the corresponding vapor pressure (ea) and relative humidity (RH). Assume Atmospheric pressure is 101,000 Pa.
The beam ABC of length L has two different moments of inertia (2I in AB, I in BC) and a constant elastic modulus E. It is fixed at point A has a roller support at point B and a load P at C. a. Sketch the deflected shape of this beam.
If an additional 11-ft lane is added (each direction) and all other factors stay the same, what will be the new level of service?
Create a MATLAB program and flowchart which will allow the user to input an unknown number of temperatures, each of which might be a temperature in Celsius, Fahrenheit, Kelvin, or Rankine, and will convert the user input temperature to each of the..
For a cantilever beam 20 ft long under a uniformly distributed load of 500 pounds/foot, calculate the deflection v and the slope dv/dx as a function of x by integrating differential equations.
List the densities in solid, liquid and gaseous state. Also compare the densities for each of them and calculate the density it will have in any ideal gas state.
Determine the forces in members DC,CB and BA of the truss. State whether the members are in tension or compression. set P=7 kN. Determine the forces in members DE and EA of the truss.
A fluid that occupies a volume of 32 L weighs 280 N at a location where the gravitational acceleration is 9.8 m/s2. Determine the mass of this fluid and its density.
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