A shallow lake can be considered a CFSTR. Nitrification, the conversion of ammonia to nitrate (NH3 -> NO3-) occurs in the lake according to first – order kinetics. One stream feeds the lake and one stream empties the lake with the flow rate in both being 8 cfs. If the first – order decay coefficient is 0.02 day-1, the influent ammonia concentration is 3.5 mg/L and effluent ammonia concentration is 0.25 mg/L, what is the volume of the lake in cubic feet?

What will the ammonia concentration be 10 miles downstream : The concentration of ammonia is 6 mg/L at one point in the river. If the first – order decay coefficient for the conversion of ammonia to nitrate is 0.05 day-1, what will the ammonia concentration be 10 miles downstream. |

What is the normal depth in a 4-foot wide rectangular : What is the normal depth in a 4-foot wide rectangular channel that conveys a discharge of 100 CFS and has a bed slope of 2% with a Manning’s roughness coefficient of 0.025? a).1.3 feet b).2.7 feet c).4.4 feet d).6.2 feet |

How many gallons would be required to last the same time : How many gallons would be required to last the same time as the gas? The sodium hypochlorite solution strength is 15 percent by weight and has the same unit weight as water (specific gravity 1.0). One pound of sodium hypochlorite has the same disinfe.. |

What concentration would correspond to a risk : The drinking water standard for dioxin is 3 x 10-8 mg/L. Using EPA exposure factors for residential consumption, what lifetime risk would this pose? What concentration would correspond to a risk of 10-6? The following data and assumptions apply: Data.. |

What is the volume of the lake in cubic feet : A shallow lake can be considered a CFSTR. Nitrification, the conversion of ammonia to nitrate (NH3 -> NO3-) occurs in the lake according to first – order kinetics. One stream feeds the lake and one stream empties the lake with the flow rate in both b.. |

Friction between the floor and the base of the ladder : Modify function random0 so that it can accept 0, 1, or 2 calling arguments. If it has no calling arguments, it should return a single random value. If it has 1 or 2 calling arguments, it should behave as it currently does. |

What is the estimated uncertainty in the length of this : The base line vector between the base and roving reciever is 8340m and has an accuracy of +/-(1to 2 cm +/-2ppm). What is the estimated uncertainty in the length of this vector? |

What is the terminal settling velocity of a particle with : What is the terminal settling velocity of a particle with a specific gravity of 1.4 and a diameter of 0.01 mm in 20 degrees celcius water? |

Use the gamma of water is equal to 1000 kg/m^3 : A horizontal 150mm pipe, in which 40 l/s of oil (S=.8) is flowing, contracts to a 75 mm diameter (left to right). If the pressure in the 150mm pipe is 300kPa, calculate the magnitude and direction of the horizontal force exerted on the contraction |

## Find the slope necessary to sustain a uniform flowA flow of 90 cfs is carried in a rectangular channel 10ft wide at a depth of 1.6 ft. If the channel is made of smooth concrete (n=0.016), find the slope necessary to sustain a uniform flow at this depth. |

## What are the cars velocity and acceleration vectorsThe car's position is defined by the position vector, where . The image below shows the system projected onto the x-y plane. What are the car's velocity and acceleration vectors at this position |

## What must the hydraulic detention time be in the aerationA perfectly mixed aeration pond with no recycle (return line) serves as the biological reactor for a small community. The pond receives 30 cubic meters/day of influent with a BOD5 of 350 mg/L that must be reduced to 20 mg/L before discharge. |

## Calculate the overflow rate and effulent weir loadingA wastewater treatment plant has two rectangular primary settling tanks, each 40 ft long, 12 ft wide, and 7 ft deep. The effulent weir length in each tank is 45 ft. The average daily wastewater flow is 387,000 gal. |

## What is its specific weightIf water vapor in the atmosphere has a partial pressure of 3500 Pa and the temperature is 30 degrees Celsius, what is its specific weight? |

## What would be the fraction converted in a half-hour runA 10-min experimental run shows that 75% of a reactant is converted to a product by a zero-order reaction rate. What would be the fraction converted in a half-hour run. Assume the reactor is a batch reactor. |

## What are the annual runoff coefficient for the sub areasWhat are the annual runoff coefficient (Runoff/Rainfall ratio) for the sub areas and for the total watershed taken as whole Sub-area Area (m2)/ Annual Precipitation (mm)/ Annual Evaporation (mm) A 10.7 1030 530 B 3.0 830 438 C 8.2 900 430 D 17... |

## Calculate the average annual price increase in salaries paidHere is some information about a professor salary index (PSI) Year PSI Change in PSI 2004 82 3.22% 2005 89 8.50 2006 100 a 2007 b 4.00 2008 107 c 2009 116 d 2010 e 5.17 2011 132 7.58 |

## Explain why should one be given priority over the otherCompare the relative contributions of a treated water supply and the collection, treatment and disposal of human wastes towards the control of epidemic diseases in developing countries |

## Find the percentage of aceticacid ionized in the solutionOne liter of a solution is made by adding 3grams of acetic acid (HAc) to distilled water. The molecular weightof acetic acid is 60.052. The acid dissociation constant for aceticacid |

## Determine the power needed for the heaterA cattle watering has a free surface with a size equal to 0.6 m x 0.3m, with the longer side being parallel to the prevailing wind. Wind at -23 C is blowing over the surface at 1 m/s. |

## Determine how would distance be accomplished specificallyA sailboat capsizes a large distance from shore. What might be done to 1) right the boat and 2) prevent this from occurring again. How would this be accomplished specifically |

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