If a student mixes 500 ml of a solution containing 50 mg/l of CaCl2 with 500 ml of containing 50 mg/l of NaHco3 what will be the hardness and alkalinity of the mixture of mg/l as CaCo3

What will be the stars rotational period : A uniform, spherical cloud of interstellar gas has mass 2.0x10^30 kg, and radius 1.0x10^13 m and is initially rotating with a period of 1.4x10^6 yrs. what will be the star's rotational period |

Calculate the f per m ration for the aeration tank : An activated sludge process receives 4000m^3 / day containing 120 mg BOD /L from the primary settling tank and 3500 m^3/day Containing 25mg BOD/L from the secondary settling tank. |

How to improve the quality of datasets : Recommend at least three (3) specific tasks that could be performed to improve the quality of datasets, using the Software Development Life Cycle (SDLC) methodology. Include a thorough description of each activity per each phase. |

Small business program and source selection plan : Small Business Program and Source Selection Plan |

What will be the hardness and alkalinity of the mixture : If a student mixes 500 ml of a solution containing 50 mg/l of CaCl2 with 500 ml of containing 50 mg/l of NaHco3 what will be the hardness and alkalinity of the mixture of mg/l as CaCo3 |

Simple linear regression and correlation : Simple Linear Regression and Correlation |

How much radiant power does it output : Scientist develop a new heat lamp to keep chicks warm in an incubator. It has a conversion efficiency of 6.5% of its input to radiant energy. how much radiant power does it output |

Determine annual emission rate of no2 leaving control device : Flue gas containing NO2is then treated by an air pollution control equipment with 85% efficiency. Determine the annual emission rate of NO2 leaving the air pollution control device. |

What is the mathematical expression for the magnetic field : A plane electromagnetic wave propagates in a vacuum in the z-direction. What is the mathematical expression for the magnetic field |

## How long would figure soil will take to reach contaminationThe local engineer concludes that, since the oil must have been destroyed by the soil microorganisms at a rate of 20 mg/kg each year, in one more year the site will be free of all contamination. a. Is this a good assumption |

## What return period must an engineer use in the designWhat return period must an engineer use in the design of a bridge opening for a 50% risk that flooding will occur at least once in two consecutive years? Repeat for a risk of 100%. |

## How would the economies of construction be obtainedFor a metal and wood structure, how would the economies of construction be obtained (pertaining to the mean and standard deviation of a probability of failure graph)? |

## Estimate critical pressure of mixture of methane nd n-hexaneEstimate the critical pressure of a mixture of methane and n-hexane if the critical temperature of the mixture is known to be 200 F. Compare your answer with the critical pressures of pure methane and pure n-hexane. |

## Explain how to determine the power input to the pumpWater enters the pump of a steam power plant as saturated liquid at 20 kPa at a rate of 45 kg/s and exits at 6 MPa. Neglecting the changes in kinetic and potential energies and assuming the process to be reversible |

## Effective thermal capacity in climatesFor energy conservation, materials with a high thermal capacity are effective in climates in which the heat flow through the building envelope is: |

## Estimate the hydraulic retention time if the reactor is pfrA biological reactor is used to treat wastewater from a small community (Q = 100,000 gpd). The influent BOD5 concentration to the reactor is 200 mg/L and the required effluent BOD5 concentration is 30 mg/L. |

## Determine what was the distance between the markersA 100 ft cut steel tape was used to measure between two property markers. The rear surveyor held 93 ft, while the head surveyor cut .67ft. What was the distance between the markers |

## Determine the heat transfer and the work for the processA cylinder fitted with a piston has a volume of 2ft^3 and contains 0.5 lbm of steam at 60 psia. Heat is tranferred to the stream until the temperatureis 500 F, while the pressure remains constant |

## Find critical depth in trapezoidal channel with bottom widthDetermine the critical depth in a trapezoidal channel with a 20 foot bottom width and 3:1 (H:V) side slopes if the Q = 1000cfs. |

## How is nitrate related to tn and tknShow that the drinking water standard of 10 mg/L nitrate as nitrogen is equivalent to 45 mg/L nitrate. How is nitrate related to TN and TKN? |

## Determine undrained shear strength on compacted soil sampleAn unconfined compression test was conducted on a compacted soil sample, 50 mm diameter by 100 mm long. The peak axial force recorded was 230 N and the sample shortened by 2 mm. |

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