Air enters an electrical furnace at 20oC, 100 kPa, with a volumetric flow rate of 30 m3/min. The furnace delivers air at 40oC to a duct system with three branches consisting of two 15-cm-diameter ducts and a 30-cm-diameter duct. The air behaves as an ideal gas, and the pressure in the exit ducts is 100kPa. If the velocity in each 15-cm duct is 4 m/s, determine, for steady operation: a) The mass flow of air entering the furnace, in kg/s. b) The volumetric flow rate in each 15-cm duct, in m3/min. c) The velocity in the 30-cm duct, in m/s.

Find the expression for the maximum torque : A length L of wire carries a current i. Find the expression for the maximum torque |

Find waters carbonate hardness and noncarbonated hardness : A municipality uses green energy and treats 15 × 106 gal/day of a groundwater containing the following: CO2 = 17.6 mg/L, Ca2+ = 80 mg/L, Mg2+ = 48.8 mg/L, Na+ = 23 mg/L, Alk(HCO3-) = 270 mg/L as CaCO3, SO42- = 125 mg/L, Cl- = 35 mg/L. |

The social economy: finding a way between market and state : Write 900 word summary for given case study. Summary should be less than 20%, more on your personal reflection and opinion. |

What is the temperature gradient along the length of the bar : A copper bar 2.5 m long has a circular cross section of radius 2 cm. One end is kept at 80oC, what is the temperature gradient along the length of the bar |

Determine the volumetric flow rate in each 15-cm duct : Air enters an electrical furnace at 20oC, 100 kPa, with a volumetric flow rate of 30 m3/min. The furnace delivers air at 40oC to a duct system with three branches consisting of two 15-cm-diameter ducts and a 30-cm-diameter duct. |

How do the two images differ from each other : an object is at a distance d to the left of a flath screen. A converging lens with focal length f |

Determine the maximum stress on the beam : draw shear and bending moment diagrams determine the maximum stress on the beam (E=2.0E+11Pa) a simply supported beam AB is 5 m long carrying a uniform distributed load of 10kn/m over a 4m span |

What does the beta of the new security have to be : You have another $8,000 to invest, and would like to invest it in a manner such that the risk of the new portfolio matches that of the overall market. What does the beta of the new security have to be? |

What length would be recorded by the observer : A meter stick travels past an observer at the speed of 0.9c. What length would be recorded by the observer |

## What are the total delay and the average delay per vehicleAssuming D/D/1 queuing, when does the initial queue clear and what are the total delay, the average delay per vehicle, longest queue length (in vehicles), and the wait time of 100th vehicle to arrive (assumin first-in-first-out) |

## Determine what is the total resistance of a wheel tractora wheel tractor scraper weighing 100 tons is being operated on a haul road which is a rutted dirt roadway (little maintanence) this tractor is traveling empty down a 5% slope. what is the total resistance |

## Value of the kinetic energy correction coefficientAssuming that the velocity variation within the main channel and the floodplain subsections is much smaller than the change in mean velocities between subsections, find the value of the kinetic energy correction coefficient. |

## What hydrodynamic model would you use for the systemSolar cookers can be used in less developed countries for cooking and also for thermal disinfection of water. To disinfect water, the water must be heated to about 35 Celsius for 5 hours. Of course, it takes time to raise the temperature of the wa.. |

## Estimate the plume mass flow rate of a pool of benzeneA pool of benzene is ignited on the floor of a large industrial building. The total area covered by the Kerosene pool is 6 meters square (Note that this is considered a large pool D>0.2 meters). Combustion efficiency is 70%. Estimate the plume mas.. |

## Design an earthen channel section into sandy soilAn earthen channel will be excavated into sandy soil for which Vmax = 4.0 ft/sec, n = 0.022, and the recommended m = 3. The channel will have a bottom slope of 0.0011 and accommodate a design flow of 303 cfs. Design (size) the channel section. |

## Determine the change in the bar thickness of axial loadAt an axial load of 23 kN, a 40-mm-wide by 10-mm-thick polyimide polymer bar elongates 2.7 mm while the bar width contracts 0.17 mm. The bar is 240 mm long. At the 23-kN load, the stress in the polymer bar is less than its proportional limit. |

## Estimate the power required to accelerate a 1350 kg vehicleThe vehicle has a frontal cross -sectional area of 1.9 m^2. The roadway has a straight alignment and a badly patched and broken asphalt surface. assume a drag coefficient of 0.3 and p of air of 1.29 kg/m^3 |

## Calculate the axial stress in the copper and the steelA steel flat bar of dimensions 4x1x12 inches is PINNED between two copper bars of dimensions 4x2x12 inches at room temp. The PINNED assembly is then cooled by 200 degrees fahrenheit. |

## What is the predicted number of zebra mussels years from nowThe zebra mussels have a net growth rate of 0.09 yr-1. At the current time there are 176 zebra mussels in the stream. What is the predicted number of zebra mussels 5, 10, and 20 years from now |

## Calculate the deflection of the beamAlso calculate the deflection of the beam to check that it complies with the design limit of L/200. Only variable actions are required for deflection check. |

## What is the mass of the fishA fish hanging from the bottom of the spring oscillates vertically at a frequency of 2.00 Hz. Ignoring the mass of the spring, what is the mass of the fish? |

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