Why do you think blacksmiths must have such hot fires to forge steel? Because metals are brittle and so need a hot fire. Because metals are able to deflect heat and so need a hot fire. Because metals absorb lots of heat, and so need a hot fire. Because metals are naturally cold, and so need a hot fires.

Physics for Scientists and Engineers, Technology Update (No access codes included)
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Author:Raymond A. Serway, John W. Jewett
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Chapter20: The First Law Of Thermodynamics
Section: Chapter Questions
Problem 20.5P: What mass of water at 25.0C must be allowed to come to thermal equilibrium with a 1.85-kg cube of...
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Why do you think blacksmiths must have such hot fires to forge steel?
Because metals are brittle and so need a hot fire.
Because metals are able to deflect heat and so need a hot fire.
Because metals absorb lots of heat, and so need a hot fire.
Because metals are naturally cold, and so need a hot fires.

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