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Thermodynamics -content– Problem 1 – 25 points A heat engine operating at steady state has a thermal efficiency of 35% and generates 100 MW of electricity while discharging energy by heat transfer to cooling water at an average temperature of 20°C. The average temperature of the steam passing through the boiler is 460°C. (a) What is the rate at which energy is discharged to the cooling water (MW)? (b) What is the minimum theoretical rate at which energy could be discharged to the cooling water (MW)? Problem 2 – 25 points Each of the parts below is a separate problem. calculate the appropriate quantity. (a) Refrigerant-134a at T = 40°F and s = 0.22194 Btu/lbm·°R. Find u (Btu/lbm). (b) Water at P = 5.0 MPa and T = 100°C. Find the exact value of s (kJ/kg·K). (c) Refrigerant-134a at P = 80 psia and T = 50°F. Find s (Btu/lbm·°R). (d) Nitrogen (ideal gas) at T = 250 K. Find (kJ/kmol·K). (e) An inventor claims to have developed a refrigerator that maintains the refrigerated space at 40°F while operating in a room where the temperature is 85°F and that has a COP of 13.5. Is this claim reasonable? Problem 3 – 25 points A Carnot heat engine drives a Carnot refrigeration cycle as shown. (a) How much work does the heat engine produce (in Btu)? (b) What is T3 (in °R)? (c) What is Q3 (in Btu)? Problem 4 – 25 points Steam at 1 MPa and 600°C enters a well-insulated turbine operating at steady state with a velocity of 50 m/s and exits at 0.01 MPa with a velocity of 100 m/s. The work developed per kg of steam flowing is claimed to be 1050 kJ/kg. Is this a valid claim? (Clearly justify your answer). Assume negligible potential energy changes. Problem 1 – 25 points Steam enters an adiabatic turbine at 8 MPa and 500°C at a rate of 18 kg/s, and exits at 0.2 MPa and 300°C. Determine the rate of entropy generation (kW/K) in the turbine. Problem 3 – 25 points Steam enters an adiabatic turbine at 8 MPa and 500°C with a mass flow rate of 3 kg/s and leaves at 30 kPa. The isentropic efficiency of the turbine is 0.90. Determine the poweroutput (MW) of the turbine. PLACE THIS ORDER OR A SIMILAR ORDER WITH US TODAY AND GET A GOOD DISCOUNT
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Supply & Demand -content– A key skill in economics is the ability to use the theory of supply and demand to analyze specific markets. In this assessment, you will demonstrate your ability to analyze the effects of several “shocks†on the market for first class mail (e.g., letters). Pay Raise: Suppose postal workers are successful in obtaining a pay raise from the U.S. Postal Service. Will this affect the supply or the demand for first class mail? Why? Which determinant of demand or supply is being affected? Show graphically with before and after curves on the same axes. How will this change the equilibrium price and quantity of first class mail? Explain your reasoning. ( identify which of the following apply: the cost of production, a change in technology, tastes and preferences, income, the price of substitutes or the price of complements affects equilibrium price and equilibrium quantity) Email and Text: Now consider the invention of email and text messaging. Explain how you imagine the invention of email and text messaging affected the market for first class mail? Why? Which determinant of demand or supply is being affected? Show graphically with before and after curves on the same axes. How will this change the equilibrium price and quantity of first class mail? Explain your reasoning. (identify which of the following apply: the cost of production, a change in technology, tastes and preferences, income, the price of substitutes or the price of complements affects equilibrium price and equilibrium quantity) Combine Cases 1 and 2: Suppose that postal workers get a pay raise and email and text messaging become common. What will the combined impact be on the equilibrium price and quantity of first class mail? Explain your reasoning and show graphically. Remember quantity falls, but change in price is indeterminate, since it depends on which curve shifts more. PLACE THIS ORDER OR A SIMILAR ORDER WITH US TODAY AND GET A GOOD DISCOUNT
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Business -content– Craft three recommendations for change that stem from your organization diagnosis using both Weisbord’s Six Boxes and your assessment of the culture of your target organization. Explain how you will communicate these recommendations to the leaders of the organization in a way that will lessen resistance and engender implementation. PLACE THIS ORDER OR A SIMILAR ORDER WITH US TODAY AND GET A GOOD DISCOUNT
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Child Abuse Prevention and Intervention -content– 1. Over the time the definition of child physical abuse has changed. The trend has to been to classify  more behavior as abusive. Is this a good thing or bad thing? 2. Should people who engage in folk medicine practices be prosecuted for child physical abuse? Why or why not? 3. If you read in the newspaper that a father told doctors that his 2 year old son had fallen off the couch and broken his arm and fractured three ribs what would you think about his account? 4. How important is parental intention in the assessment of child physical abuse? Should acts that were not meant to harm the child but did harm the child be considered abusive? 5. Do you think the laws regarding child physical abuse should cover only harm or both threatened harm? why or why not? PLACE THIS ORDER OR A SIMILAR ORDER WITH US TODAY AND GET A GOOD DISCOUNT
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