(4 blanks) An ice-making machine operates in a Carnot cycle. It takes heat from water at 0.0 °C and rejects heat to a room at 24.0 °C. Suppose that 85.0 kg of water at 0.0 °c are converted to ice at 0.0 °C. How much energy (in Joules) must be supplied to the machine to achieve this task? Sol. Since the machine is a operating in a Carnot cycle, then, its efficiency is e = 1 |-| TC THỊ By virtue of first law, the work done to convert water to ice is given by W = Q = -mLf Thus, the total energy needed to convert 85 kg of water is 687.5 J

(4 blanks) An ice-making machine operates in a Carnot cycle. It takes heat from water at 0.0 °C and rejects heat to a room at 24.0 °C. Suppose that 85.0 kg of water at 0.0 °c are converted to ice at 0.0 °C. How much energy (in Joules) must be supplied to the machine to achieve this task? Sol. Since the machine is a operating in a Carnot cycle, then, its efficiency is e = 1 |-| TC THỊ By virtue of first law, the work done to convert water to ice is given by W = Q = -mLf Thus, the total energy needed to convert 85 kg of water is 687.5 J

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter15: Thermodynamics

Section: Chapter Questions

Problem 6PE: (a) How much food energy will a man metabolize in the process of doing 35.0 kJ of work with an...

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(a) How much food energy will a man metabolize in the process of doing 35.0 kJ of work with an efficiency of 5.00%? (b) How much heal transfer occurs to the environment to keep his temperature constant? Explicitly show how you follow the steps in the Problem—Solving Strategy for thermodynamics found in Problem-Solving Strategies for Thermodynamics.
QUESTION 2 (4 blanks) An ice-making machine operates in a Carnot cycle. It takes heat from water at 0.0 °C and rejects heat to a room at 24.0 °C. Suppose that 85.0 kg of water at 0.0 °C are converted to ice at 0.0 °C. How much energy (in Joules) must be supplied to the machine to achieve this task? Sol. Since the machine is a operating in a Carnot cycle, then, its efficiency is e = 1 -| TC /TH| By virtue of first law, the work done to convert water to ice is given by w = Q = Thus, the total energy needed to convert 85 kg of water is ET = 687.5)
QUESTION 2 (4 blanks) An ice-making machine operates in a Carnot cycle. It takes heat from water at 0.0 0C and rejects heat to a room at 24.0 °C. Suppose that 85.0 kg of water at 0.0 °C are converted to ice at 0.0 °C. How much energy (in Joules) must be supplied to the machine to achieve this task? Sol. Since the machine is a operating in a Carnot cycle, then, its efficiency is e = 1 -| TC TH| By virtue of first law, the work done to convert water to ice is given by W = Q = Thus, the total energy needed to convert 85 kg of water is ET = 687.5J
4 blanks) An ice-making machine operates in a Carnot cycle. It takes heat from water at 0.0 oC and rejects heat to a room at 24.0 oC. Suppose that 85.0 kg of water at 0.0 oC are converted to ice at 0.0 oC. How much energy (in Joules) must be supplied to the machine to achieve this task? Sol. Since the machine is a operating in a Carnot cycle, then, its efficiency is e = - |/TH| By virtue of first law, the work done to convert water to ice is given by W = Q = Thus, the total energy needed to convert 85 kg of water is ET = 687.5 J
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