Chapter 16 to 18

# Chapter 16 to 18 - Chapter 16 Due: 11:59pm on Friday, May...

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Chapter 16 Due: 11:59pm on Friday, May 13, 2011 Note: You will receive no credit for late submissions. To learn more, read your instructor's Grading Policy [ Switch to Standard Assignment View ] Multiple Choice Problem 16.2 Suppose you put a hot object in contact with a cold object and observe (with some wonder) that heat flows from the cold object to the hot object, making the cold one colder and the hot one hotter. Part A This process would violate ANSWER: only the first law of thermodynamics. only the second law of thermodynamics. both the first and the second laws of thermodynamics. Correct Problem 16.4 An aircraft engine takes in 9000 of heat and discards 6400 each cycle. Part A What is the mechanical work output of the engine during one cycle? ANSWER: = 2600 Correct Part B What is the thermal efficiency of the engine? ANSWER:

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Problem 16.4 Part A 28.9 Correct Problem 16.14 In one cycle, a freezer uses 800 of electrical energy in order to remove 1750 of heat from its freezer compartment at 10.0 . Part A What is the coefficient of performance of this freezer? ANSWER: = 2.19 Correct Part B How much heat does it expel into the room during this cycle? ANSWER: 2550 Correct Problem 16.20 A heat engine is to be built to extract energy from the temperature gradient in the ocean.
Problem 16.20 Part A If the surface and deepwater temperatures are 25.0 and 8.00 , respectively, what is the maximum efficiency such an engine can have? ANSWER: = 5.70 Correct Problem 16.29 A sophomore with nothing better to do adds heat to 0.340 of ice at 0 until it is all melted. Part A What is the change in entropy of the water? ANSWER: = 416 Correct Part B The source of the heat is a very massive body at a temperature of 25.0 . What is the change in entropy of this body? ANSWER: -381 Correct

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Problem 16.29 Part C What is the total change in entropy of the water and the heat source? ANSWER: = 34.9 Correct Problem 16.40: Solar collectors. A well-insulated house of moderate size in a temperate climate requires an average heat input rate of
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## This note was uploaded on 05/02/2011 for the course PHYSICS 256 taught by Professor Weston during the Spring '11 term at WPUNJ.

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Chapter 16 to 18 - Chapter 16 Due: 11:59pm on Friday, May...

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