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A device that takes in heat and turns part of it into mechanical work is a:

AHeat element
BHeat envelope
CHeat engine
DHeat exchange
Answer & Solution
Correct answer: C. Heat engine
1. Heat goes in from a source. 2. Useful work comes out. 3. That device is a heat engine. _Source: OpenStax University Physics Volume 2, Chapter 4, The Second Law of Thermodynamics._
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