No, the transfer of energy from a hot object to a cold object when they are placed in contact does not violate the principle of energy conservation. Energy conservation states that the total energy of a closed system remains constant over time.
When a hot object and a cold object are in contact, heat transfer occurs between them. Heat flows naturally from a region of higher temperature (hot object) to a region of lower temperature (cold object) until thermal equilibrium is reached. This process follows the laws of thermodynamics, specifically the second law, which governs the direction of heat transfer.
The transfer of heat from the hot object to the cold object is an example of energy being redistributed within the system. The energy lost by the hot object due to heat transfer is equal to the energy gained by the cold object. The total energy within the system (which includes both objects) remains conserved.
It's important to note that while energy is conserved, the temperature of the hot object decreases, and the temperature of the cold object increases until they reach equilibrium. This change in temperature is a result of energy transfer, but the total energy of the system remains constant throughout the process.
Therefore, the transfer of energy from a hot object to a cold object when they are placed in contact does not violate the principle of energy conservation.