Test: High School Physics

1.

Which of the following represents the first law of thermodynamics?

If a refrigerator is unplugged, eventually everything inside of it will return to room temperature

Two systems in equilibrium with a third system are in equilibrium with each other

While melting, an ice cube remains at the same temperature

The specific heat of an object explains how easily it changes temperatures

After falling down the hill, a ball's kinetic energy plus heat energy equals the initial potential energy

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