1.Experiment: Cold water and warm water.

Great, your answer is correct!

The human body always has a temperature of 37°C. What we feel, is simply the differences to this temperature or differences between two temperatures.

The thermo receptors of our skin are responsible for that. They are also responsible for feeling warmth and cold. They are ends of nerves that perceive changes in temperature..

In the experiment, one hand was cooled down with the cold water. Once the hand is put into bowl B with warm water, your hand absorbs a significant amount of heat from the water. This is registered by the thermo receptors - the water feels warm. The other hand was heated up by the hot water. Once the hand is put into bowl B with the warm water, your hand emits some of its heat to the water. This is registered by the thermo receptors - the water feels cold.