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प्रश्न
Why does heat flow from a hot object to a cold object?
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उत्तर
Because entropy increases when heat flows from a hot object to a cold object. If heat were to flow from a cold to a hot object, entropy will decrease leading to violation of second law thermodynamics.
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संबंधित प्रश्न
State Kelvin-Planck's statement of the second law of thermodynamics.
Define heat engine.
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Explain the heat engine and obtain its efficiency.
Explain in detail the Carnot heat engine.
Derive the expression for Carnot engine efficiency.
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Let η1 is the efficiency of an engine at T1 = 447°C and T2 = 147°C while η2, is the efficiency at T1 = 947°C and T2 = 47°C. The ratio `eta_1/eta_2` will be ______.
What is a heat engine?
