It means the relationship between two systems connected only by a diathermic wall.
Summer days are warmer because the path of the sun is longer and we have more direct sunlight during that time
Answer:
A. Frictional
Explanation:
Friction is the force created when two solid objects in contact try to move past each other.
Thomson's model included Protons and Electrons. His model is referred to as 'Plum Pudding' because of it.