A river with 400 ppm of salts (a conservative substance) and an upstream flow of 25 m^3/s receives an agricultural discharge of 5.0 m^3/s carrying 2000 mg/L of salts. The salts quickly become uniformly distributed in the river. A municipality just downstream withdraws water and mixes it with enough pure water (no salt) form another source to deliver water having no more than 500 ppm salts to its costumers. What should be the mixture ratio of pure water to river water?

What is the total delay to the passengers in the 20 depart : An airport runway has a capacity of 60 operations (ie landing and take-offs) per hour. In a particular hour, there are 30 landings evenly spaced over the hour. |

Which arguments might each dismiss : Which arguments might each dismiss? |

Determine the force in wire ab : The specified concrete strength fc for a new building is 6000 psi. Calculate the required average strength fc for the concrete ( a) if there are no prior test results for concrete with a compressive strength within 1000 psi of fc made with sim-ilar m.. |

Calculate how many chlorine atoms will be in an average : Calculate how many chlorine atoms will be in an average neoprene chain? b) Sketch the bonding between polychloroprene chains due to sulfur linkages as neoprene is vulcanized into an elastomer. c) You decide to go swimming in Bear Lake in late Novembe.. |

What should be the mixture ratio of pure water to river : A river with 400 ppm of salts (a conservative substance) and an upstream flow of 25 m^3/s receives an agricultural discharge of 5.0 m^3/s carrying 2000 mg/L of salts. The salts quickly become uniformly distributed in the river |

What is the gage pressure in chamber a : Two chambers, A and B both have manometers with the same fluid with specific gravity 1.4. When h(sub a) = 6 cm and h(sub b) = 4 cm, what is the gage pressure in chamber A? |

What is the value of ka for ha : A 0.15 M aqueous solution of the weak acid HA at 25.0 C has a pH of 5.35. What is the value of Ka for HA ? |

A stoichiometrically equivalent amount of fe2o3 : A stoichiometrically equivalent amount of Fe2O3 |

Bohr model of the hydrogen atom is incorrect : Which of the following statements regarding the Bohr model of the hydrogen atom is incorrect? |

## Required height of the roller coasterDetermine the required height h of the roller coaster so that when it is essentially at rest at the crest of the hill it will reach a speed v= 100km/hr when it comes to the bottom. |

## Determine what is the elevation of the pvtThe high point is at elevation 1011.4 ft. The initial grade is +2% and the final grade is -1%. What is the elevation of the PVT. Solve this problem with the parabolic equation rather than by using offsets. |

## Calculate average flow rate and hydraulic gradientThe cylinder has a length of 120 cm and a diameter of 12 cm. The field sample with a porosity of 0.24 is tested under a constant head difference of 160 cm with water at 10 degree Celcius. |

## Determine the total stress the pore water pressureA layer of clay 5 m thick overlies a deposit of sand 5 m thick, which is underlain by rock. The water table in the sand is sub- artesian with a level at 2 m below ground level |

## How to compute the final lengths and azimuths of linescalculate departures and latitudes, misclosures in departures and latitude, and traverse relative precision. Balance the departures and latitude using the compass rule, and calculate coordinates of points B, C, and D. |

## If the bar is reloaded then what is the proportional limitA circular bar of magnesiuen alloy is 750 mm long. The bar is loaded in tension to an elongation of 6.0 mm, and the load is removed. (a) what is the permanent set of the bar (b) if the bar is reloaded, what is the proportional limit |

## Compute the speed of the sandbags just as it hits the groundDuring a hot air balloon race one specific balloon, initially at rest, accelerate vertically upward at a constant rate of a=4.5 ft/s^2 when t0=42 s from the ground the surface, which is at an altitude above mean sea level of s0=3750 ft. |

## Determine the properties at the final state and the amountTwo tanks (Tank A and Tank B) are separated by a partition. Initially Tank A contains 2 kg of steam at 1 MPa and 300 ?C while Tank B contains 3 kg of saturated liquid-vapor mixture at 150oC with a vapor mass fraction of 50% |

## Determine the resultant of the four force sand its line ofFour forces act on a small airplane in flight: its weight (24kN), the thrust provided by the engine (10 kN), the lift providedby the wings (23 kN), and the drag resulting from its motionthrough the air (3 kN). |

## Draw elevation, plan and development of the lateral surfacesAxis of the hole is perpendicular to VP. Draw elevation, plan and development of the lateral surfaces of the pyramid. |

## Calculate the flow rate in the pipe between the reservoirsTwo reservoirs are connected by a pipeline. The pipeline is 1 m in diameter and has a friction factor of 0.03. The elevation difference between the reservoirs is 30 m. The two reservoirs are 5 km apart. |

## Determine peak discharge if unit hydrograph is triangularA hydrograph has a uniform rainfall intensity of 1.5 in/hr in the first hour, 2.0 in/hr in the second, and 0.75 in/hr in the third hour. Direct runoff (in inches) using the SCS method is 1.2in. |

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