Question

questions

1. what is the difference between heat and thermal energy?
2. in which direction does heat always flow?
3. what does \thermal equilibrium\ mean?
4. why do railroad tracks have small gaps between sections?
5. how does a thermometer work?
6. why do you think metal spoons are not recommended for cooking with non - stick pans?
7. how is radiation different from conduction?
8. if you place a cold can of soda and a room - temperature can of soda on the table, what will happen to their temperatures over time? how could you test this?
9. how does convection help heat an entire pot of soup?
10. when you feel the sun’s warmth on your face, which type of heat transfer are you experiencing?

Explanation:

Answer:

1. Thermal energy is the total internal energy of a system, while heat is the transfer of thermal energy between systems due to a temperature difference.
2. Heat always flows from a region of higher temperature to a region of lower temperature.
3. Thermal equilibrium is the state in which two or more objects in physical contact have reached the same temperature and there is no net heat flow between them.
4. To allow for thermal expansion and contraction of the metal without warping or buckling the tracks.
5. It works through thermal expansion; as the temperature increases, the liquid inside expands and rises up a calibrated tube.
6. Metal spoons can scratch and damage the delicate non-stick coating (like Teflon) of the pan.
7. Conduction requires direct physical contact between particles, while radiation transfers energy through electromagnetic waves and does not require a medium.
8. The cold can will warm up and the room-temperature can will stay the same (or both will reach room temperature); you could test this using thermometers.
9. As the soup at the bottom heats up, it becomes less dense and rises, while cooler, denser soup sinks, creating a circulation current that distributes heat.
10. Radiation.