2 September 2014

Question

My Answer

a i ) B will be more sensitive . A bigger bulb will contain more mercury , with the same increase in temperature , more mercury will expand more ,thus there will be a bigger rise up the stem for the same increase of temperature and giving a clearer reading , hence be more sensitive .

b i ) B will be more sensitive . The volume of mercury in both thermometers will increase by the same amount , but as B have a fine bore thus a bigger rise up the stem and give a cleaner reading , hence  be more sensitive .

a ii ) A will be more responsive . As there is less mercury , less time is needed to heat up to the same temperature as the surrounding , thus it is more quick acting and is more responsive .

b ii ) They are of the same responsiveness because the size of the capillary bore does not effect the transfer of thermal energy .

a iii ) A will have a larger range . For the same increase in temperature , there will be a less increase in mercury as there is less mercury in the smaller bulb . For the same length of the stem , the range will thus become larger .

b iii ) A will have a larger range . The mercury will expand the same but in the wider bore the rise in stem is smaller , thus more reading can be calibrated on its stem , hence the range become larger .

Test

Test

15 August 2014

Question

Group discussion 

http://youtu.be/-nkZJi1Upkw

Presentation for question 1 

http://youtu.be/MZu_RKBqOqE

Presentation for question 2

http://youtu.be/H2vALfcAe8w

13 August 2014

Question

 

State and explain the phenomenon .

Group answer 

My Answer 

State :

The same liquid with different densities due to the difference in temperature are used in the experiment.

Explain :

The red colored water which is hot water has lower density than the green water , thus it rise above the green water . The green colored water which is cold water has higher density than the red water , thus sinks to replace the red water . The yellow colored water is formed by the water that is originally in the container and is at room temperature , thus it stays in the middle of the red colored water and green colored water . 

30 July 2014

Question

Group's answer

My answer

a ) To heat the ring .

b ) The ring need to become bigger in order for the ball to pass through , so we heat the ring thus the molecules in the ring overcome the attractive forces between them , causing the increase in distance between the molecules . As the inner circle of the ring cannot provide enough space for the molecules to spread out , the ring will only expand outwards to gain more space to move freely .

23 July 2014

Question

Group's answer

Think 3

Think 4

My answer

Think 3

Both the parquet and the tiles have the same temperature , but the tile is a better conductor of thermal energy than the parquet . So as the body which has higher temperature than the tile transfer more thermal energy at a higher rate to the tile compared to the parquet which is a poorer conductor of thermal energy . This is because thermal energy travels from a hotter region to a colder region .

Think 4

17 July 2014

Mr Suria's question





Group's answer



Personal answer

Think 1

When we enter the air conditioned room , the surrounding air is has a lower temperature than our body temperature . So as thermal energy travels from the hotter region to the colder region , our hotter body temperature was lost to the colder surrounding air . Thus , we feel colder .

Think 2

When we came out of the swimming pool ,  our body was wet due to the water droplets , thus colder than the surrounding  air . As thermal energy travels from the hotter region to the colder region , the colder water droplets on our body gains heat from our body and the surrounding air and evaporate , thus we shiver to shake off some water droplets , thus transfer less thermal energy to the water droplets from the body in order to feel warm .