Heat Flow and Thermodynamics

Heat Flow and Thermodynamics

Read each question carefully and answer to the best of your ability. Show all your work for numerical problems.

1. Which of the following is the primary mode of heat transfer in fluids?

2. The rate of heat transfer by conduction is directly proportional to:

3. The transfer of heat through electromagnetic waves is known as  .

4. A material that readily transfers heat is called a  , while a material that resists heat transfer is called an  .

5. Heat always flows from a region of lower temperature to a region of higher temperature.

6. Convection can occur in solids, liquids, and gases.

7. Describe the key difference between conduction and convection, providing an example for each.

8. Explain how a thermos flask minimizes heat transfer through all three modes (conduction, convection, and radiation).

9. A metal rod, 0.5 m long and with a cross-sectional area of 0.002 m², has one end maintained at 100°C and the other at 20°C. If the thermal conductivity of the metal is 200 W/(m·K), calculate the rate of heat flow through the rod.