Vita Answer

3a) Milk bottle X
3b) Water is a better conductor of heat than air.

4a) Point A
4b) 20min - 5min = 15 min
4c) A passenger/ Jane had just sat on the seat (0.5m), heat is gained by the seat from his/her body (0.5m) causing the seat to gain more heat and the temperature rises at point C. (1m)

5a) Possible ans: A and D/ A and C/ B and D/ C and D
5b) D , B

6a) (The question is about Carly so the answer should be specific to Carly) 
      Carly was losing heat quickly to the environment.
6b) The air in the room gained more heat (1m) as heat from more heat was loss by the increased number of people in the room.

7a) Styrofoam
7b) Styrofoam is a poor conductor of heat (1m) so the heat loss from the noodles to the surrounding air was reduced. (1m)
7c) There is an increased exposed surface area (0.5m) to allow more heat loss (0.5m) from the noodles to the surrounding air. 
7d) Noodles: heat loss; Chopsticks: heat gain 

Hope this help :)
Mrs R

Vita ans

Dear all,

I am having trouble with my Internet connections. 

I will try to type the answers from my Ipad.

I will provide the answers tomorrow if I cannot get it across today.

Do not spent too much time online, please revise :)

Mrs R 

Extra Supplementary Class on Friday

Dear all,

Please note that this coming Friday, 19 October 2012, from there will be an extra-supplementary class from 1.30pm to 3.30pm. This is in place of the classes that we have missed due to holidays and examinations.

Thank you.
Mrs R

SA2 Practice 2 Answer Key

Dear all,

Found below is the answer key for SA2 Practice 2.

Please use the above answer key to check your corrections and help you to understand your working or provide alternative working to help you answer your questions better.

Thank you.
Mrs R

SA2 Practice 1 Answer Key

Dear all,

Found below is the answer key for SA2 Practice 1.

Please use the above answer key to check your corrections and help you to understand your working or provide alternative working to help you answer your questions better.

Thank you.
Mrs R

S16 Supplement

Solve this question.

Fred has $60 and George has $40 in their bank account. Everyday, Fred deposits $5 while George deposits $9.

(a)    How long does it take for Fred and George to have the same amount of money in their account?

(b)    How many days will George need to save in order to have $40 more than Fred?

 

Discuss with your friend how you have derived your answers.

Have fun!

Mrs R

S15 Supplememnt

Solve this question.

Mrs Gopal had some $2, $5 and $10 notes in her purse.  The number of $5 notes was 1/3 the number of $2 notes.  The number of $10 notes was 1/2 the number of $2 notes. After spending all her $10 notes and 2/3 of her $2 notes, she had $210 left in her purse. How much money did she spend altogether?

Discuss with your friends.
Have fun!
Mrs R