The concentration of UBOD in a river entering the first of two lakes that are connected in a series is equal to 20m/L. If the first-order BOD reaction rate constant (K) equals 0.35 d^-1 and complete mixing occurs in each lake, what is the concentration of UBOD at the outlet of each lake? The flow in the river is equal to 4000 m^3/d and the volume of the first and second lake is 20,000 and 12,000 m^3, respectively. Assume steady-state conditions.

If the length of the river connection between the two lakes is equal to 3km and the velocity in the river is equal to 0.4 m/s, determine the concentration of UBOD in the effluent from the second lake.

How would you communicate the design of method to developer : How would you communicate the design of method to a developer that must implement a complex algorithm and ensure that they implement correctly when provided good inputs as well as handle bad input and no input scenarios? |

By what fraction does the speed of the muon decrease : A muon is a lepton that is a higher-mass (rest mass 105 MeV/c^2) sibling to the electron. By what fraction does the speed of the muon decrease |

The standpoint of developmental stages : 7 pages personal life review from the standpoint of developmental stages & the contextual, cohort -based, maturity-specific challenge model as it would apply to using age graded standards for context, cohort effects, social & family role |

Calculate the sum of all the elements of firstarray : Calculate the sum of all the elements of FirstArray and put the sum in EAX. Use indirect addressing to access the elements of array. |

Determine the concentration of ubod in the effluent : If the length of the river connection between the two lakes is equal to 3km and the velocity in the river is equal to 0.4 m/s, determine the concentration of UBOD in the effluent from the second lake. |

What is the speed of the emitted electron : The glow-in-the-dark dials on some watches and some keychain lights shine with energy provided by the decay of radioactive tritium, 3^1H. What is the speed of the emitted electron |

Determine what fraction of processor time is consumed : Consider a system employing interrupt-driven I/O for a particular device that transfers data at an average of 8 KB/s on a continuous basis. |

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## Describe does the sample meet the niosh standardThe National Institute for Occupational Safety and Health (NIOSH) sets standards for CCl4 in air at 12.6 mg/m^3 of air (a time average over 40 hr). The CCl4 found in a sample is 4800 ppb. Does the sample meet the NIOSH standard |

## Determine the momentum change of a person with a massSuppose that a person who boards the elevator on the ground floor gets off on the fifth floor. Assuming that the elevator has achieved operating speed by the time it reaches the second floor and that it is still moving at its operating speed as it.. |

## Elevation of the road at stationGiven the following data for a vertical curve of a road; G1=-2.5%, G2=+5.5% and station of PVI=250+50.At station 252+50, the vertical curve must intersect an existing road at elevation 48.48ft. the elevation on the tangent section at station 256+5.. |

## Find length and width of square basin for virus disinfectionFind the length and width of a square basin for virus disinfection of a flow of 6 MGD. You may assume a depth of 5 ft, a C•t product of 10 (mg/L) •min for 1.5-log removal, and a target free chlorine residual of 0.6 mg/L. |

## Determine max hoop stresses on inside fibers of rifle barrelDetermine the maximum hoop stresses on the inside fibers of a rifle barrel which is 3 feet long with an O.D. = 3.0" and an I.D. = 1.0". The internal pressure = 10,000 psi. Use the F.E. reference manual for determining these stresses. |

## How is the spent carbon removed from the pressure contactorsTesting has already been completed on the water and the Usage Rate for the carbon is 0.4 pounds of carbon per 1000 gallons of water treated. The required EBCT is 20 minutes and the carbon longevity must be at least 6 months. |

## Express samples hardness in meq per l and mg per l of caco3Hardness is sum of all divalent cations (meaning all species with a positive charge of 2) in a water sample. Magnesium (Mg2+) and calcium (Ca2+) are the most common divalent cations that contribute to hardness. |

## Compute the magnitues of all the forces acting on memberCompute the magnitues of all the forces acting on member CDE of the frame. There are pins at C D and E and an 80 kelp force on the right. Length measurements are in ft. |

## Predict the temperature required in an isothermal plug flowUsing the method of lee et al. predict the temperature required in an isothermal plug flow incinerator to reduce the xylene level in a waste gas from 1000 ppm to 10ppm. Assume a residence time of 0.7 sec. |

## Provide a diagram showing the cost of the truss as functionA project for constructing a Facility just started. It involves the excavation of 40 to 60 feet deep and 60 feet wide trench to house double tunnels. A 24-inch outside diameter (22.5-inch inside diamater) water line is located in the path of the t.. |

## Determine moisture content required to have full saturationA sample of dry soil is mixed uniformly with 16 wt% water and then compacted into a cylindrical mold in the laboratory. The volume of moist soil is 1x10-3 m3 and its mass is equal to 1.60 kg. |

## What is the tce concentration in mg per cubic meterThe concentration of trichloroethelyne (TCE) in an air sample near a hazardous waste landfill is 34 ppm, the ambient air temperature is 31 degrees C, and the atmospheric pressure is 0.94 atm. What is the TCE concentration in mg/m^3 |

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