Hot coffee in a mug cools over time and the mug warms up. which describes the energy in this system?

the average kinetic energy of the particles in the mug decreases.

the average kinetic energy of the particles in the coffee increases.

thermal energy from the mug is transferred to the coffee.

thermal energy from the coffee is transferred to the mug.

The correct option is "Thermal energy from the coffee is transferred to the mug."

Explanation:

This is because heat always flows from the hot source to the cold source. These cooling processes are spontaneous (the hot coffee cools down because its temperature is higher than the temperature of the external medium), however, the heating processes are not (to heat the mug you need another previously heated source).

Kinetic energy is directly related to temperature. This means that as the temperature of the system increases, the average kinetic energy of the particles increases.

Have a nice day!

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