Question 1
An aluminum cylindrical container has an overall surface area of 0.2 m² and a wall thickness of 50
cm. The temperature of the inner surface is 15.0°C, and the outside temperature is 25°C. If it takes
2.0 h for 20.0 kg of ice to melt in the container, describe the energy processes that occurred. Then,
calculate the thermal conductivity of the aluminum container.
Let say, the same aluminum cylindrical container (only container not the situation is fitted with a
piston that moves freely and the water is replaced with a fixed amount of an ideal gas. The gas is at a
temperature of 23ºC with an initial volume of 1.5 x 104 m². Then the gas has been heated to a
temperature of 95°C under constant pressure, state the new condition of the volume as the gas is
heated. Explain your answer in terms of motion the molecules. Calculate the new volume.
If the mass of each gas molecule is 5.7 x 10-26 kg, calculate the average speed of the
gas
molecules
at 95°C.
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