Question: If you add boiling water to a cup at room temperature, what would you expect the final equilibrium temperature of the unit to be? You will need to include the surroundings as part of the system. Consider the zeroth law of thermodynamics.
The final equilibrium temperature of the unit or the system will be the same as the room temperature. The heat flow of a system is from higher to lower. Here the heat is the transfer from the hot water to the surroundings until it attains the same temperature.
The law states that when two objects with different temperatures are in thermal contact with each other. And the heat will flow from the hot object to the cold one until the temperature of both objects will same.
Here you are adding boiling water to a cup that is at room temperature. The surrounding temperature is less than the temperature of the water. So, the heat energy transfer from hot water to the surrounding air, so that they reach thermal equilibrium with each other if you placed it for some time.
Question: The height of the Washington Monument is measured to be 170 m on a day when the temperature is 35.0ºC. What will its height be on a day when the temperature falls to –10.0ºC? Although the monument is made of limestone, assume that its thermal coefficient of expansion is the same as marble’s.
Question: One method of getting a tight fit, say of a metal peg in a hole in a metal block, is to manufacture the peg slightly larger than the hole. The peg is then inserted when at a different temperature than the block. Should the block be hotter or colder than the peg during insertion? Explain your answer.
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