Sunday, 27 July 2014

Think 1

End of Week One of Physics
Questions 



My Group's Answer:

Individual Answer
Macro: When we are outside the room, the temperature of the surroundings is hotter, therefore our body will gain thermal energy, and our body temperature increases. When we enter the air conditioned room, the tempearture of the surroundings is now much cooler then our body temperature. Thus as thermal energy travels from a hotter region to a colder region, our body loses thermal energy to the surroundings and we will start to feel cold when we enter the air conditioned room.
Micro: 
The air molecules in the air vibrates faster than our body's molecules during a hot day, therefore kinetic energy from the surrounding air molecules will be transferred to our body's molecules, thus the body temperature increases. When we enter a air conditioned room, the air molecules in the air conditioned room are moving much slower then our body's molecules. Therefore the kinetic energy from our body's molecules will be transferred to the molecules in the air conditioned room, and we will feel cold when entering it.

Think 2
My Group's Answer
The body's temperature is higher than the water on the body surface. Thus, the water gains heat from the body and evaporates, bringing away the kinetic energy of the atoms, causing atoms of the body surface to move slower and therefore the temperature of the body decreases.

Individual Answer: 
Macro
After getting out from the swimming pool, as the temperature of the surroundings is higher. The water on the body surface will gain thermal energy, and evaporate and therefore taking away thermal energy away from the body. The temperature of the body will drecrease, and thus our body will feel colder. Our body shivers as our body wants to gain warmth.
Micro
When we get out of the swimming pool, the surrounding temperature is higher, and the molecules on our body are moving faster than the molecules of the water on the surface of our body. The kinetic energy between the molecules of the body will be transferred to the water molecules on the body surface very quickly to allow the water to change state and evaporate. With lesser kinetic energy between the molecules in our body, the tempearture of the body is now cooler as a lot of thermal energy is lost in a very short amount of time, and as a result the body shivers so that it can gain some energy for it to get warmth again.