Suppose a sample of hot iron is dropped in a cup of room temperature water.
a) what happens to the temperature of the iron & water?
b.) in what direction does heat flow occur?
c.) when does heat flow stop?
d.) assuming no heat is lost to the environment, compare heat gained and lost by the iron and water.
T of Fe goes down. T of water goes up.
Heat flows from Fe to H2O
Heat flow stops when T Fe = T H2O
heat lost by Fe = heat gained by H2O
a) When the hot iron is dropped in the cup of room temperature water, the temperature of both the iron and water will change. The hot iron will start losing heat to the water, while the water will begin gaining heat from the iron. As a result, the temperature of the iron will decrease, and the temperature of the water will increase.
b) Heat flows from a higher temperature object to a lower temperature object. In this case, the heat flow will occur from the hot iron to the room temperature water. This means the heat will move from the iron to the water.
c) Heat flow will continue until both the temperature of the iron and the water reach thermal equilibrium. Thermal equilibrium is reached when the two objects have equal temperatures, and no further heat flows between them. At this point, heat flow will stop.
d) Assuming no heat is lost to the environment, the heat gained by the water will be equal to the heat lost by the iron. This is based on the principle of conservation of energy, which states that energy cannot be created or destroyed, only transferred from one form to another. Therefore, the heat gained by the water is equal to the heat lost by the iron.
a) When the hot iron is dropped in a cup of room temperature water, the temperature of both the iron and water will change.
The hot iron will start losing heat to the cooler water, causing its temperature to decrease. As it continues to transfer heat to the water, the iron will cool down and eventually reach the same temperature as the water.
The room temperature water will absorb the heat from the hot iron, causing its temperature to increase. As the water gains heat, its temperature will rise until it reaches equilibrium with the iron.
b) Heat flows from a higher temperature to a lower temperature. In this case, since the iron is hotter than the water, heat will flow from the iron to the water.
c) Heat flow stops when both the iron and the water reach thermal equilibrium, meaning they have the same temperature. At this point, no further heat transfer occurs because there is no temperature difference to drive the heat flow.
d) Assuming no heat is lost to the environment, the amount of heat gained and lost by the iron and water will be equal. This is known as the principle of conservation of energy, which states that energy cannot be created or destroyed, only transferred or converted from one form to another. Therefore, the heat lost by the iron will be equal to the heat gained by the water.