N - Problem N.4 A heat engine absorbs 6000 J of heat from a...

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Chapter N - Problems Blinn College - Physics 2425 - Terry Honan Problem N.1 What is the change in entropy of 3 kg of water initially at 20 °C when it is cooled and frozen resulting in ice at 0°C? Problem N.2 What is the total change in entropy when 3000 J of heat flows into a house at 20 °C from the warm exterior at 40 °C? Problem N.3 What is the total change in entropy when a 20 g ice cube at 0 °C is dropped into the Gulf of Mexico, which is at a temperature 15 °C? It is quite safe to assume that the temperature change of the Gulf is negligible.
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Unformatted text preview: Problem N.4 A heat engine absorbs 6000 J of heat from a hot reservoir and expels 4100 J to a cold reservoir at 30 C. (a) What is the efficiency of this engine? (b) What is the work done by the engine? (c) What is the smallest temperature the hot reservoir could have? Problem N.5 A Carnot engine that operates between a 500 K hot reservoir and a 300 K cold reservoir has a power output of 6000 W. What is the efficiency of this heat engine? At what rate does this engine absorb heat?...
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This document was uploaded on 02/01/2010.

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