Thermodynamics

Two objects at different temperatures are placed in thermal contact. In which direction will thermal energy flow?

A metal pot is placed on a hot stove. Is this an example of heating or cooling, and why?

What is the definition of thermal equilibrium between two or more systems?

Two systems are in thermal equilibrium. Which of the following statements is true about the rate of energy transfer between them?

Three objects with different masses and initial temperatures are placed in thermal contact inside an insulated container. After a long time, they reach thermal equilibrium. Which equation could be used to find the final temperature, assuming no phase changes?

Which of the following materials is best suited for insulating a building?

A glass window with an area of 2 $m^2$ and a thickness of 0.005 m has a temperature difference of 10°C between its inner and outer surfaces. If the thermal conductivity of the glass is 0.8 W/(m·K), what is the rate of heat transfer through the window?

A wall is constructed of two layers: an inner layer of material A with thermal conductivity $k_A$ and an outer layer of material B with thermal conductivity $k_B$. The layers have equal thickness. If the thermal conductivity of material A is twice that of material B ($k_A = 2k_B$), how does the rate of heat transfer th...

A metal rod is heated. What happens to its dimensions?

A steel bridge is 100 m long at 20°C. The linear expansion coefficient of steel is $12 \times 10^{-6}$ $K^{-1}$. What is the change in length of the bridge when the temperature increases to 40°C?