Final answer:
Rubbing hands converts work into thermal energy, hitting a nail transmits kinetic energy, using a torch converts chemical energy into thermal and light energy, a public address system converts electrical energy into sound energy.
Step-by-step explanation:
1) Rubbing your hands together: Rubbing your hands together warms them by converting work into thermal energy. The friction between your hands converts mechanical energy into thermal energy, increasing the temperature of your hands.
2) A carpenter hitting a nail: When a carpenter hits a nail with a hammer, the kinetic energy of the hammer is transferred to the nail. This energy causes the nail to move, and if it penetrates a material, it does work by changing the position of the nail.
3) Using a torch: Using a torch involves the conversion of chemical energy in the form of fuel into thermal energy and light energy. This energy conversion happens through combustion, which releases heat and light.
4) A public address system in use: A public address system uses electrical energy to convert it into sound energy. The electrical energy from a power source is transformed into sound waves using transducers, such as microphones and speakers.