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Unformatted text preview: PHYS 153 Homework 6A Problem 1 The figure below shows a Carnot heat engine driving a Carnot refrigerator. (a) Determine Q 1 , Q 2 , Q 3 , and Q 4 . (b) Is Q 3 greater than, less than, or equal to Q 1 ? (c) Do these two devices, when operated together in this way, violate the second law? Explain. Problem 2 A heat engine uses a diatomic gas that follows the pV cycle in the figure below. (a) Determine the pressure, volume, and temperature at point 1. (b) Determine U th , W s , and Q for each of the three processes. Put your results in a table for easy reading. (c) How much work does this engine do per cycle and what is its thermal efficiency? Problem 3 A 0 . 0500 kg cube of ice at an initial temperature of- 15 C is placed in 0 . 600 kg of water at T = 45 . C in an insulated container of negligible mass. (a) Calculate the final temperature of the water once the ice has melted. (b) Calculate the change in entropy of the system....
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