If two objects are in thermal contact, energy can flow between them. For example, if an ice cube is placed in a copper pan, the ice molecules are in thermal contact with the copper atoms. Assuming that the copper is warmer
than the ice, thermal energy will flow from the copper to the ice. When two objects in thermal contact stop having
a flow of energy between them, they are in thermal equilibrium.
1 A 200g sample of water initially at 80°C is mixed with 200 g of water at 10°C. Assuming no heat is lost to the
surroundings, determine the final temperature of the mixture