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Question: Methylene chloride, a solvent used in the photographic and drug industries, is a major pollutant and a potent carcinogen. Accordingly, there is currently a national effort aimed at finding substitutes for this solvent. Failing this, there is interest in designing packed towers using excess dry air to strip this solvent out of water and feed the resulting vapor stream to an incinerator. The problem is that the methylene chloride is to be stripped under conditions where large quantities of water evaporate simultaneously. In other words, the mass transfer of the methylene chloride may be altered by the mass transfer of the water.
(a) Present equations giving the water flux under these conditions. Use these to calculate the diffusion-induced convection.
(b) Show how this convection alters the flux of methylene chloride, even though the methylene chloride is dilute.
(c) To make this quantitative, assume the maximum water concentration in the vapor is half the total concentration and that both mass transfer coefficients are equal. What is the change in methylene chloride flux?
Question: Explain why the free rider problem makes it difficult for perfectly competitive markets to provide the Pareto efficient level of a public good.
Some commentators have argued that the failure of the “Super committee” is good thing for the economy? Do you agree?
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Explain the impact of external costs and external benefits on resource allocation; Why are public goods not produced in sufficient quantities by private markets? Which of the following are examples of public goods (or services)? Delete the incorrec..
Describe the differences between shifts in demand and movements along the demand curve. What are the main factors which can shift the demand curve? Explain why they cause the demand curve to shift. Use examples and draw graphs to support your discuss..
Article Review Question: Read the following excerpts from the article "Fruit, veg costs surge' by Todd, Dagwell, published in the Herald on January 25th 2011 and answer questions below:
Long-term Growth, International Trade & Globalization:- This question deals with concepts such as long-term growth, international trade and globalization. Questions related to trade deficit, trade surplus, gains from trade, an international trade sce..
"Does the economic bailout of Spain and Greece spell the beginning of the end for the European Monetary Union (EMU)?"
Read the rules of the game, the overview and the almanac for the Development Game "Settlers of Catan"
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