Biology; Chemistry; Physics: Post your doubts here!

[asma tareen]

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

well i dint thank GOD thnx for elling

 

[AhsanAfzal]

help me plsssss
and i downloaded it

 

[AhsanAfzal]

 

[asma tareen]

help me plsssss
and i downloaded it

dint we help u

 

[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

 

[asma tareen]

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

check the previous pages plzz

 

[asma tareen]

actually the same page

 

[AhsanAfzal]

actually the same page

u did the wrong question. Q9 is about centripetal

 

[farhan141]

Please Help

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s12_qp_22.pdf

Q.7
and
Q.9 Whole

 

[ijlalm]

d(iii) The car undergoes a change in velocity. It accelerates (and does so at a constant rate - if the rate of turn is constant) in the direction of the turn. The speed is constant, but the direction the car is going changes at each instant in time because it is turning. And because it is changing direction, that means its velocity is changing (because velocity is speed plus a direction vector).

 

[asma tareen]

u did the wrong question. Q9 is about centripetal

is it

 

[HDIWAN]

A is the answer as it says aluminium is RARE in the earth crust which is false

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.

 

[AhsanAfzal]

d(iii) The car undergoes a change in velocity. It accelerates (and does so at a constant rate - if the rate of turn is constant) in the direction of the turn. The speed is constant, but the direction the car is going changes at each instant in time because it is turning. And because it is changing direction, that means its velocity is changing (because velocity is speed plus a direction vector).

this was asked in part (i)

 

[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 :'(

 

[AhsanAfzal]

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 :'(

write the link from xtremepapers

 

[Ahmed Alaa El-shamy]

write the link from xtremepapers

http://papers.xtremepapers.com/CIE/Cambridge%20IGCSE/Biology%20(0610)/0610_w05_qp_6.pdf
Q3 a)

 

[AhsanAfzal]

http://papers.xtremepapers.com/CIE/Cambridge%20IGCSE/Biology%20(0610)/0610_w05_qp_6.pdf

Q3 a)

sorry i dont study igcse i am of o level

 

[Ahmed Alaa El-shamy]

sorry i dont study igcse i am of o level

oops sorry my mistake i did not see that i am in the olvls

 

[Amen]

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

Q9(b) by the formula F=f+ma where f(weight or force opposite to the direction of moyion) nd F(driving force that is upward force)
F=1.6x10*7+3,2x10*7=48000000

Q9d3 F=ma 650x8=5200

 

[Amen]

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

extension of each spring will be 1cm as in parallel springs extension becomes half of the original