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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
A gas contained in a cylinder surrounded by a thick layer of insulating material is quickly compressed.
- Has there been a transfer of heat?
- Has work been done?
Answer in brief:
A gas contained in a cylinder surrounded by a thick layer of insulating material is quickly compressed has work been done?
State Clausius form of the second law of thermodynamics.
State Kelvin-Planck's statement of the second law of thermodynamics.
Explain in detail the Carnot heat engine.
Derive the expression for Carnot engine efficiency.
A Carnot engine whose efficiency is 45% takes heat from a source maintained at a temperature of 327°C. To have an engine of efficiency of 60% what must be the intake temperature for the same exhaust (sink) temperature?
A heat engine operates between a cold reservoir at temperature T2 = 400 K and a hot reservoir at temperature T1. It takes 300 J of heat from the hot re ervoir and delivers 240 J of heat to the cold reservoir in a cycle. The minimum temperature of the hot reservoir has to be ______ K.
What is a heat engine?
Mention any two elements of a heat engine.
