Biology; Chemistry; Physics: Post your doubts here!

[papajohn]

its wx folded three times and one wx the side original side like the one other than the folded ones

I did this with the paper and then it was 8..

 

[usama321]

its wx folded three times and one wx the side original side like the one other than the folded ones

lol its almost impossible to explain this

Why we divide the reading by 8 rather than 6??

either do it in your head, or do it with a paper

 

[papajohn]

Atp is very logic based..

 

[asma tareen]

Atp is very logic based..

yea it is

 

[ijlalm]

Does anyone know..what is the function of a potentiometer??

 

[ayesha121997]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w12_ms_42.pdf
qustion no 4 (iv) do i have to show refraction....???

 

[ayesha121997]

Does anyone know..what is the function of a potentiometer??

with potentiometer potential differnce is varied....

 

[ayesha121997]

any body plz tell me relationship between potential difference and resistance????

 

[asma tareen]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w12_ms_42.pdf
qustion no 4 (iv) do i have to show refraction....???

i think yes

 

[ayesha121997]

i think yes

are u sure???

 

[asma tareen]

are u sure???

WELL I THINK IT WOULD BE BETTER IF U POST THE PAPER

 

[ayesha121997]

Mostly in paper one, the question is about the limit of proportionality of a spring. According to Hooke's law, force = k* extension, where k is constant, so that with an increase in force, the extension of the spring should be the same. E-g lets say we add a weight of 2N to a spring, and its length increases by 2cm. Now for the next 2 N, the length should again increase only by 2cm. That is we have a constant increase.

But the limit of proportionality is when the spring stops obeying hooke's law, and its extensions starts increasing non uniformly, like 4 cm for the same 2N weight. When this happens, the spring is permanently deformed, and the total weight at which this happened is the limit of proportionality of the spring.

but what would happen if 2 N force is applied to two parrallel springs ???

 

[AhsanAfzal]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w11_qp_21.pdf
Q9 (b)- v=
and

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w11_qp_22.pdf
Q9 (d) iii=

pls explain these

 

[tdk]

a
A

Why not C? Extraction of Al requires a lot of energy. That's why Al is more expensive than Fe.
On the other hand Al is the most abundant metal in the Earth's crust(about ). So I think answer is C.

 

[Ahmed Alaa El-shamy]

BIOLOGY Can someone help me please
There is a question in OCT/NOV 2005 Paper 6
Suggest how you would observe the yeast cells and how you would estimate their total population in the flask?
i looked it up in the marking scheme but still i don't understand the answer :'(

 

[asma tareen]

first paper
bi) 0
ii) firstly it will inrease thn becomes constant
iii)a=1000-600/2o=20m/s2

 

[ijlalm]

Q9 (d) can be calculated by the formula F-f=ma (where F is the driving force , f is the opposing force, m is the mass and a is the acceleration).. The difference b/w F and f is the resultant force on the car..

 

[asma tareen]

Chemistry Guess Paper of Imran Merchant

can u convert it to PDF

 

[usama321]

Chemistry Guess Paper of Imran Merchant

it contains an exe file.........seriously?

 

[usama321]

can u convert it to PDF

ok its a virus don't open it, i just scanned it. And do report the person