Final answer:
The temperature of oil heated on a hot plate at thermal equilibrium will match the temperature of the hot plate, which is 150 °C. Maintaining appropriate oil temperature is critical in automotive engines to ensure proper lubrication and avoid overheating.
Step-by-step explanation:
The question pertains to the concept of thermal equilibrium in Physics, where it is important to ensure that the temperature of oil in an engine or a similar system does not exceed certain thresholds to prevent damage due to overheating. When oil is heated in a pan on a hot plate and reaches thermal equilibrium, the oil and the hot plate will be at the same temperature. If the hot plate's temperature is 150 °C, then the temperature of the oil will also be 150 °C.
In the context of car engines and other machinery, oil serves as a lubricant and must maintain an appropriate viscosity to function correctly. As per LibreTexts™, the viscosity of oil changes with temperature, and if it becomes too thin, it loses its effectiveness. Therefore, to prevent issues such as oil overheating, the oil should not be in thermal contact with surfaces that could raise its temperature beyond safe limits. Most car radiators operate at temperatures above 95.0 °C, but to avoid engine damage, it is generally recommended that oil temperatures do not exceed 225 °F (107 °C).