Can a medium involve \((a)\) conduction and convection, (b) conduction and radiation, or \((c)\) convection and radiation simultaneously? Give examples for the "yes" answers.

Conduction is the transfer of heat through a solid medium, where particles transfer their kinetic energy to nearby particles without changing their relative positions. Convection is the heat transfer through a fluid (gas or liquid) involving the movement of particles within the fluid due to changes in temperature and density. Radiation is the transfer of heat in the form of electromagnetic waves (infrared rays) without requiring a medium for propagation.

Now, let's analyze the combinations using the definitions from Step 1: (a) Conduction and Convection: Can a medium involve conduction and convection simultaneously? Yes, this is possible. For example, in heating a pot of water on a stovetop, heat is transferred by conduction through the solid material of the pot and then by the convection within the water as the temperature increases. (b) Conduction and Radiation: Can a medium involve conduction and radiation simultaneously? Yes, this is possible as well. For example, a metal rod being heated on one end will experience heat transfer via conduction, and at the same time, it can also emit and receive infrared radiation to/from the surroundings. (c) Convection and Radiation: Can a medium involve convection and radiation simultaneously? Yes, this is possible. For instance, consider the Earth's atmosphere. It involves both free and forced convection of air currents that redistribute heat, as well as the absorption and emission of infrared radiation - from the Sun and the Earth itself. In summary, it is possible for a medium to involve combinations of conduction, convection, and radiation simultaneously. The examples provided illustrate each of these cases.