Physics: Post your doubts here!

[The Sarcastic Retard]

Specimen papers 2015, please?

 

[Sinzzzz]

i think you need some pictures to help you learn it.
View attachment 42439
does that make anything clear?

i still dont get it

 

[Suchal Riaz]

i still dont get it

http://en.wikipedia.org/wiki/Standing_wave#/media/File:Standing_wave_2.gif

 

[Lyfroker]

Assalamualaikum.
I'm not quite sure about the ratio they used in the mark scheme but this is how I solved it

Thanks that helped a lot

 

[Lyfroker]

http://freeexampapers.com/A-Level/Physics/CIE/2005-Jun/9702_s05_qp_4.pdf

Q#3(b)(ii) why will we add (24 x 4.2 x T) ?

 

[Lyfroker]

http://freeexampapers.com/A-Level/Physics/CIE/2005-Jun/9702_s05_qp_4.pdf

Q#5(b)
Can anyone attach the correct pic of the sketch, I'm not sure of mine

 

[Lyfroker]

http://freeexampapers.com/A-Level/Physics/CIE/2005-Jun/9702_s05_qp_4.pdf

Q#7(a)

 

[bubbles1997]

Please share the guess paper for biology practical 33
https://www.xtremepapers.com/community/threads/as-biology-33-2015-m-j.41027/

 

[nehaoscar]

Specimen papers 2015, please?

Have you found them?
When you find them please could you send me a link too?

 

[The Sarcastic Retard]

Have you found them?
When you find them please could you send me a link too?

Sure.

 

[Sam Ivashkov]

Hello. I have a question in paper 9702/42/M/J/10, the very last question [12b (ii)]. Can someone explain the working and concept and reasoning behind it step by step? If you do, please show you answer at each step also. Thanks.

 

[Aliya Naqvi]

Can someone explain why the k.e of the deuterium nuclei and proton be equal?

 

[Lyfroker]

http://freeexampapers.com/A-Level/Physics/CIE/2005-Jun/9702_s05_qp_4.pdf

Can anyone help please
Q#3(b)(ii) why will we add (24x4.2xT)?
Q#5(b)
Q#7(a)

 

[phanttasy]

guys, do you have any reference book for physics recommend?

 

[The Chill Master]

May 2007 Q3 b part

 

[The Sarcastic Retard]

bi) mass unit is kg.
A is m^2
rho is kgm^-3
h is m
so A * rho * h = kg = mass.

ii)
pressure = force / area.
pressure = mass * g / area
pressure = A*rho*h*g/A = rho*g*h

 

[The Chill Master]

bi) mass unit is kg.
A is m^2
rho is kgm^-3
h is m
so A * rho * h = kg = mass.

ii)
pressure = force / area.
pressure = mass * g / area
pressure = A*rho*h*g/A = rho*g*h

Sorry i forgot to mention P4

 

[The Sarcastic Retard]

Sorry i forgot to mention P4

3b)
Count the number of squares to get the area. I got 21cm^2.
now u should calculate the pd represented by 1cm^2.
1cm^2 = side2 x side2
= (2.5 x 10^3) (1 x 10^-2)
= 25 V
now multiply the total are u calculated first (21 cm^2 ) into 25V
21 x 25 = 525 V

 

[Aina]

Need help m/j2011 paper 41 ques 10 part c

 

[The Chill Master]

3b)
Count the number of squares to get the area. I got 21cm^2.
now u should calculate the pd represented by 1cm^2.
1cm^2 = side2 x side2
= (2.5 x 10^3) (1 x 10^-2)
= 25 V
now multiply the total are u calculated first (21 cm^2 ) into 25V
21 x 25 = 525 V

Thank's a bunch.