Physics, Chemistry and Biology: Post your doubts here!

[thats_me]

could you tell me how to solve question 3)(c) in the november 2010 physics paper 61
link :- http://www.xtremepapers.me/CIE/Cambridge IGCSE/0625 - Physics/0625_w10_qp_61.pdf

also june 2011 question 1 (c)
link: http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s11_qp_61.pdf

thanks in advance.

Here..
3c: It says that the current will be 0.5I0, which means0.5*I0( Io=0.3(frm part a))
so 0.5*0.3=0.15
now Look for this value in the table and get the corresponding value for 'R'
R=10.1
Then it says the total resistance(10.1) is twice of the resistor X
so 1o.1 +x=2x
10.1=2x-x
10.1=x
1c: U need to write about Parallax error i.e the line of eyesight should be perpendicular to the card..

 

[za Shadow]

guys should we start any graph from zero (0) or if the values we have for eg. 70, 80, 90, 100. can we start from 70 (even though the question didn't specify anything about the scale)???????????

 

[Ritter]

Here..
3c: It says that the current will be 0.5I0, which means0.5*I0( Io=0.3(frm part a))
so 0.5*0.3=0.15
now Look for this value in the table and get the corresponding value for 'R'
R=10.1
Then it says the total resistance(10.1) is twice of the resistor X
so 1o.1 +x=2x
10.1=2x-x
10.1=x
1c: U need to write about Parallax error i.e the line of eyesight should be perpendicular to the card..

Thanks for your help

 

[thats_me]

guys should we start any graph from zero (0) or if the values we have for eg. 70, 80, 90, 100. can we start from 70 (even though the question didn't specify anything about the scale)???????????

for startin from any other value u need to break the graph

 

[za Shadow]

for startin from any other value u need to break the graph

ammm what do u mean by break the graph?????

 

[thats_me]

ammm what do u mean by break the graph?????

u make like this kinda thing /\/ in the startin of the axis

 

[Manobilly]

You put a zigzag line starting from the axis.

 

[za Shadow]

u make like this kinda thing /\/ in the startin of the axis

You put a zigzag line starting from the axis.

ohh ok thank u both soo much

 

[Ahmed Raouf]

m/j/03 paper 6 , Q3 b(iii) pls help fast exam in 1.5 hours

 

[Yousif Mukkhtar]

m/j/03 paper 6 , Q3 b(iii) pls help fast exam in 1.5 hours

The gradient of the graph is decreasing.

 

[NIM]

23 degrees usually.

oh ok thnx!!

 

[Saadiya Ahmed]

Just take a value frm yaxis & one frm xaxis of the graph and extend them towards each other such that they form a triangle , Try doin it..

then wat we do is divide the difference in y axis over the difference in x axis ryte?
i did tht..and styll i get an incorect ans!!

 

[NIM]

guys need help!!!
1)...Elements Cl and F can form an ionic compound.Draw a diagram that shows the formula of this compound, the charges on the ions and the arrangement of the valency electrons around the negative ion.
Use o to represent an electron from an atom of Cl.
Use x to represent an electron from an atom of F.

 

[kboss]

guys need help!!!
1)...Elements C and F can form an ionic compound.Draw a diagram that shows the formula of this compound, the charges on the ions and the arrangement of the valency electrons around the negative ion.
Use o to represent an electron from an atom of C.
Use x to represent an electron from an atom of F.

http://www.twiddla.com/830008...click this

 

[Saadiya Ahmed]

how do we find the gradient of a graph by the triangle method?....detailed explaination pleasee!!!!

 

[Moi]

Do we need to know the diff. between electrolytic cell and Galvanic Cell ?? Fast answer Plz

 

[aliqamar1995]

HELP !!! PLEASE Q6. part b, http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w04_qp_3.pdf

 

[Moi]

HELP !!! PLEASE Q6. part b, http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w04_qp_3.pdf

i believe it'll be like this :


sorry bad drawing!

 

[imperial]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w10_qp_33.pdf
3c (iv) WHY THE V IS 0.6 EXACTLY? HOW DO WE KNOW THE EXACT VALUE? I KNOW IT SHOULD BE BETWEEN BUT THE MARK SCHEME SAYS 0.6

 

[imperial]

www.xtremepapers.com/spapers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w10_qp_33.pdf
5b (iv)

please help me in the past quetsion too

EDIT: they r just 1 mark and 2 mark question shodnt take long