Final answer:
Boiling water transfers kinetic energy to an ice cube, illustrating the process of reaching thermal equilibrium in accordance with thermodynamic principles.
Step-by-step explanation:
Boiling water transfers energy to an ice cube is an example of energy transfer, specifically, the transfer of kinetic energy from the higher temperature water to the lower temperature ice. This process is representative of how thermal equilibrium is reached as the hot water molecules collide with the colder ice molecules, effectively transferring energy until both reach a similar temperature. This is aligned with thermodynamics, where heat moves from warmer to cooler objects until equilibrium is established.