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Why does heat flow from a hot object to a cold object?

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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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पाठ 8: Heat and Thermodynamics - Evaluation [पृष्ठ १५९]

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सामाचीर कलवी Physics - Volume 1 and 2 [English] Class 11 TN Board
पाठ 8 Heat and Thermodynamics
Evaluation | Q II. 47. | पृष्ठ १५९

संबंधित प्रश्‍न

The figure shows the V-T diagram for one cycle of a hypothetical heat engine which uses the ideal gas. Draw the p-V diagram diagram of the system.


State Kelvin-Planck's statement of the second law of thermodynamics.


What are the processes involves in a Carnot engine?


Explain in detail the Carnot heat engine.


Suppose a person wants to increase the efficiency of the reversible heat engine that is operating between 100°C and 300°C. He had two ways to increase efficiency.

  1. By decreasing the cold reservoir temperature from 100°C to 50°C and keeping the hot reservoir temperature constant
  2. by increasing the temperature of the hot reservoir from 300°C to 350°C by keeping the cold reservoir temperature constant.

Which is the suitable method?


10 One mole of a van der Waals' gas obeying the equation `("P" + "a"/"V"^2)`(V - b) = RT undergoes the quasi-static cyclic process which is shown in the P-V diagram. The net heat absorbed by the gas in this process is ______

 


Heat engine transfers ______. 


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.


Draw a neat labelled P - V diagram for a typical heat engine. 


The thermal efficiency of a heat engine is 25%. If in one cycle the heat absorbed from the hot reservoir is 50000 J, what is the heat rejected to the cold reservoir in one cycle?


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