Question: Explain why it is necessary to write a negative sign in an expression that equates the energy lost by the more energetic body in a

Explain why it is necessary to write a negative sign in an expression that equates the energy lost by the more energetic body in a calorimeter experiment as being equal to the energy gained by the less energetic bodies.

Give an example that relates the First Law of Thermodynamic to an observation or event that you have observed outside of class.

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