A Pumped-storage facility uses two identical pump-turbines. When operating as pumps, these units have an efficiency of 0.82, and when operating as turbines, their efficiency is 0.86. The motor-generators installed with these pump-turbines have an efficiency of 0.85 when operating as motors and 0.91 when operating as generators. Each pump-turbine uses its own 100-m-long, 150-cm steel penstock. The gross head at the site is 45m, and draft-tube losses may be assumed to be negligible. When operating as pumps, the pump-turbines can each delivery 27 m^3/s into the reservoir, which has a useful capacity of 1.75 * 10^6 m^3. When operating as turbines, the pump-turbines each deliver 9400 kW to their generator shafts. If power is purchased at 25 mils/k Wh for pumping, at what rate must generated power be sold in order to obtain a positive net annual revenue of at least $310,000?

Determine what is the rotational velocity at the instant : A fan blade, initially at rest, rotates with a constant rotational acceleration of 0.9rad/s^2. What is its rotational velocity at the instant it goes through an rotational displacement of 5 radians |

Find the cutoff wavelength for copper : The work function for copper is 4.70 eV. Find the cutoff wavelength for copper |

Define what is the change in internal energy in kj : A gas is compressed from 68.2 L to 8.0 L at 0.70 atmospheres? In addition a total of 3300 J of heat are gained from warmer surroundings. What is the change in internal energy in kJ |

When a company is faced by a kinked demand curve : When a company is faced by a kinked demand curve, the marginal revenue curve will be: |

Determine at what rate must generated power be sold in order : The motor-generators installed with these pump-turbines have an efficiency of 0.85 when operating as motors and 0.91 when operating as generators. Each pump-turbine uses its own 100-m-long, 150-cm steel penstock. |

Define the pauli principle''s effects on rotational levels : Which of the following molecules do you think would be subject to the Pauli principle's effects on rotational levels? (Check all that apply) a. methane b. dihydrogen c. HCl d. water e. dinitrogen f. dinitrogen where one atom is isotope 14 and the .. |

To build rx''s marketing plan : To build RX's marketing plan, this assignment focuses on IMC and customer satisfaction for your product and service. |

What general journal entry : Stock at 30 June 2012 was valued at cost $5200 and the net realization value $5300. With selling costs $200. What general journal entry? |

Discuss the effects of nafta on : World Trade - Discuss the effects of NAFTA on: the United States, Canada, and Mexico. Is the European Union (EU) the real competitor of the U.S. in world trade? What other nations or groups of nations are now in the picture? (Support for your positio.. |

## What is appropriate pressure at the point of max stenoticBlood is flowing through an aorta of 1.0 cm diameter at an average velocity of 50 cm/s. The mean pressure is 100 mm Hg, The blood enters a stenosis where the aortic diameter is 0.5 cm. What is the appropriate pressure at the point of maximum steno.. |

## Determine whether the bar will plastically deformA force of 100 000 N is applied to a 10 mm x 20 mm rectangular cross-section iron bar in tension. If the iron has a yield strength of 400 MPa and a tensile strength of 480 MPa, determine: whether the bar will plastically deform |

## Prepare a capstone reportPrepare a capstone report for designing of steel building using AISC 14 edition manual. |

## What textbooks are used and requiredWhat textbooks are used and required for CIVE 205, MECH 289, CIVE 290, EPSC 221 and MATH 263 at McGill? |

## Determine how many combinations of 2 books can be selectedA customer randomly select 2 of 10 books to purchase. How many combinations of 2 books can be selected |

## Define holographic mobile phonesA young engineer has invented holographic mobile phones and has approached a venture capital company to invest in it. The venture capital company considers the product to be an all or nothing product |

## Aggregate in the wheelbarrow weightYou fill a 2-cubic foot wheelbarrow to the top with aggregate. if the specific gravity of the aggregate is 2.548 and 18% of the aggregate is void spaces, how much does the aggregate in the wheelbarrow weight? |

## Estimate the volume of soilA proposed earthen dam will contain 5,000,000 cubic meters of earth. Soil to be taken from a borrow pit will be compacted to a void ratio of 0.78. The void ratio of soil in the borrow pit is 1.12. Estimate the volume of soil (cubic meters) that mu.. |

## Velocity profile from the pipe wallCompute points on the velocity profile from the pipe wall to the centerline of a 3/4-in Type K copper tube if the volume flow rate of water at 60 degrees F is .50 gal/min. |

## Determine what constricted width would be to force the flowGiven that uniform flow is subcritcal and there is a constriction in a rectangular channel, how do you determine what the constricted width would be to force the flow to be critical. Draw this transition on a specific energy curve. |

## Presedimentation-uspended solids concentration of raw reversPresedimentation can reduce the suspended solids concentration of raw river water from 500 mg/L to 200 mg/L. How many pounds of dry solids does this represent per million gallons? |

## Depth of the sedimentation tankA drinking water treatment plant will be designed to process a flow of 15,000 m3/d. The sedimentation tank will have a residence (detention) time of 4 hours and the overflow rate (Q/A) of 16 m 3 /m 2 -day. Estimate the required surface area (A), an.. |

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