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The demand for electric power is usually much higher during the day than it is at night, and utility companies often sell power at night at much lower prices to encourage consumers to use the available power generation capacity and to avoid building new expensive power plants that will be used only a short time during peak periods. Utilities are also willing to purchase power produced during the day from private parties at a high price. Suppose a utility company is selling electric power for $0.03/kWh at night and is willing to pay $0.08/kWh for power produced during the day. To take advantage of this opportunity, an entrepreneur is considering building a large reservoir 50 m above the lake level, pumping water from the lake to the reservoir at night using cheap power, and letting the water flow from the reservoir back to the lake during the day, producing power as the pump–motor operates as a turbine– generator during reverse flow. Preliminary analysis shows that a water flow rate of 2 m^3/s can be used in either direction, and the irreversible head loss of the piping system is 4 m. The combined pump–motor and turbine–generator efficiencies are expected to be 75 percent each. Disregarding the frictional losses in piping and assuming the system operates for 10 h each in the pump and turbine modes during a typical day, determine the potential revenue this pump–turbine system can generate per year.
Explain how the concepts of leadership and management distinct from each other. In what areas do they overlap?
After the horror of 9/11, many people said the CIA and FBI should obviously have foreseen the likelihood of this form of terrorism. This perception most clearly illustrates:
Differentiate between substantive and procedural due process. In light of these differences and the protections of the Fifth and Sixth Amendments, should criminal defendants be allowed to be present during the grand jury's adjudication?
Describe how the "beauty myth" creates an identity in women that affects their role as a worker, a consumer, a family member
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How did Bismarck's system of alliances help maintain peace? What was the purpose of the German-Russian Reinsurance Treaty? Why did it end in 1890? What were the reasons for Britain and Germany's love-hate relationship?
Discuss your preconceived notions about the experience. Explain how your notions were impacted by group influence.
What works with recommendation letters? What sort of recommendation letter has really helped you to get work?
Wet air containing 4.0 mole% water vapor is passed through a column of calcium chloride pellets. The pellets adsorb 97.0% of the water and none of the other constituents of the air.
Select one theory of personality and use this theory to tell Michael how this theory explains his or her situation.
Can someone give me statistics and specific examples of these disadvantages from the literature?
Analyze the ways in which the U.S. government regulates product safety and make at least one recommendation for how the regulatory approach of one of the agencies discussed (FDA, CPSC, or NHTSA) could be improved. Explain your rationale
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