ON23 P42 Q3 Thermodynamics and Rain Puddles | Oct/Nov 2023 | Cambridge A Level 9702 Physics

9702/42/O/N/23 3 (a) State what is meant by the internal energy of a system.
(b) Use the first law of thermodynamics to explain what happens to the internal energy:
(i) of a spring when it is stretched at constant temperature within its elastic limit
(ii) of a sample of water when it evaporates from a rain puddle on a hot day.

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