Question


1. Look at the two energy-way diagrams shown below. Diagram 1 Diagram 2 Eth of the stuff Eth of the stuff Eth of the surroundings a) Which of them cannot describe a real physical process? Explain why. b) For the diagram that can be correct, give two different examples of real physical processes that can be represented by that diagram.

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Answer #1

1.

a)

Diagram 1 cannot represent a real physical process. Here, the energy of the stuff and surroundings, both are increasing which will not be possible from the conservation of energy.

b)

The second diagram represent the real physical process in which the stuff is absorbing energy from the surroundings.

Examples are: Air Conditioner and Refrigerator

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