[O Level Mathematics] - N2009P1Q13(a)

Lee012lee SG

"O" Level E.Maths Question : Nov 2009 P1 Q13(a)

When d is 12 cm, the answer for t is given as 2 seconds.

My working is

V1/V2 =(d1/d2)^3 where V1 = volume of water when d1 = 12 cm^3

V2 = voulme of water when d2 = 24 cm^3

V1/V2= (12/24)^3

V1/V2= 1/8

V1=(1/8)V2

The container is filled with water after 8 seconds.

So, V2 ------ 8s

V1= (1/8)V2 ------ ?s

(1/8) x 8 = 1s.

So, when the depth is 12 cm, t is 1 second.

Did I make a mistake or the given answer is incorrect ?

Thanks.

PS : SAP solution has used A1/A2 = (d1/d2)^2 to get the answer t is 2 seconds.

I disagreed with the use of A1/A2 as water is poured into the container, we should use V1/V2. So, the answer should be t = 1 second. Please correct me if I am wrong. Thanks.

UltimaOnline SG

Always indicate the subject in your title header. "Physics" or "Chemistry" or "Mathematics" etc.

Lee012lee SG

Always indicate the subject in your title header. "Physics" or "Chemistry" or "Mathematics" etc.

Hi UltimaOnline,

Thanks for the reminder as it had been many months that I last visited sgforums.com homework forums.

I will make immediate changes to my earlier post.

Thanks.

Regards.

Lee012Lee

SBS n SMRT SG

My year o level qns, the answer given is correct, as Area should be used as if I did not remember wrongly, the height is constant. (Trick!)

Refer to http://www.exampaper.com.sg/wp-content/uploads/gce-o-level-2009-emaths-4016-paper-1-solutions.pdf

for full answers

Lee012lee SG

My year o level qns, the answer given is correct, as Area should be used as if I did not remember wrongly, the height is constant. (Trick!)

Refer to http://www.exampaper.com.sg/wp-content/uploads/gce-o-level-2009-emaths-4016-paper-1-solutions.pdf

for full answers

Hi SBS n SMRT,

Thanks for the reminder that the height is constant and I have discovered my mistake and thanks for the url link.

Regards,

Lee012Lee