Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

Heat can be transferred for low temperature to high temperature source by using refrigeration cycle
Heat can be transferred from low temperature to high temperature source if COP of process is more than unity
Heat can
Heat can

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Engineering Thermodynamics
Extensive property of a system is one whose value

Depends on the mass of the system like volume
Is dependent on the path followed and not on the state
Does not depend on the mass of the system, like temperature, pressure, etc.
Is not dependent on the path followed but on the state

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