A2 Physics | Post your doubts here

[Arslan Ahmed]

salam ,can anyone help on the application thing , i got a big burden i m having p4 p3 phy ,p3,p4 maths

 

[umarashraf]

salam ,can anyone help on the application thing , i got a big burden i m having p4 p3 phy ,p3,p4 maths

which topic..???

 

[smartangel]

Q3 b ii part 1..how to find amplitude? http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_w08_qp_4.pdf​

 

[ousamah112]

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w10_qp_43.pdf
q3 part b....plz

 

[ousamah112]

.If we melt ice at 0'C to water at 0C, is work done on the system by te systme or no work??? explain..

 

[Mustehssun Iqbal]

work done= pressure x change in volume
change in volume= (2.1 x 10^3 x 10^-6)-(1.8 x 10^3 x 10^-6)
w.d= 1.o x 10^5 x change in volume..

dont forget to change cm(cube) to metre(cube)!

well in derving work done = p delta v....we assumed the gas expanding or contracting against constant external pressure....chek chapter 4 chriss mee book for frther clarification

yes..pressure is considered to be constant.

thanks a bunch

 

[ousamah112]

thanks a bunch

np...but plz answer my questions tooo

 

[busy bee]

can anyone explain me this question ?
two (+30*10^-6) C charges are placed on a straight line 0.40m apart.A (+0.5*10^-6) C charge is to be moved a distance of 0.10m along the line from a point midway between the charges. how much work must be done ?

 

[busy bee]

I am not sure if u guys are in a way of studying like this but i find these easy to learn in the following hence providing you all with a way too learn Mobile Circuit.... Hope it helps..

Meri - microfone
Ami Foran - a.f amplifie
Ati - ADC
pitti - Parralell to Digital
marti - modulator-ossilator
aur - amplifier
sunati - switch
aesay - aerial

Hope it help... Will keep on posting ...........

nyc one !! really helped

 

[cuppycake]

http://www.xtremepapers.com/CIE/International A And AS Level/9702 - Physics/9702_s05_qp_4.pdf
i dont get Q6)b)i,ii,iii plz help me out

 

[scoobydoo]

guys how do you calculate area under curve like in june 2007 q3 part b i really need help, http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s07_qp_4.pdf

 

[smartangel]

http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s07_qp_4.pdf
Q4.part i. i know the working but why is marking scheme rounding off 138 to 140? cant we leave it as 138??

 

[user]

Assalamoalaikum wr wb!

Rectification: http://www.flashscience.com/electricity/smoothing.htm
helpful...move the sliders and see what'd happen when you change capacitence, or resistance etc.
This type of questions actually come ...the graph ones

 

[bumble26]

Please help me in Q1b(ii)

 

[namename]

Is this correct?

 

[user]

Is this correct?

View attachment 9238

Aoa!
yup it is..!

 

[namename]

Aoa!
yup it is..!

Thanks!

 

[namename]

Help me also for s05 6b)

I'm confused... my book says the applied emf and the induced emf across the secondary coil are out of phase by 180 (pi)..
and the answer to question b iii) is 90 (pi/2) .. why is this so?
Do u think my book has an error? is this correct? (Sorry for bad drawing)

 

[user]

np...but plz answer my questions tooo

Assalamoalaikum wr wb!

on thursday i think,you asked a question about the graph for diode/rectification one, and u said you didnt et it..sorry cudn't postsome pic that day..
here's it:
hope it helps...




http://www.flashscience.com/electricity/smoothing.htm

^check this link to see why there's a flat line in the graph...there'll be a part...when one set is working and the other two are not and vice versa..

 

[user]

Help me also for s05 6b)

I'm confused... my book says the applied emf and the induced emf across the secondary coil are out of phase by 180 (pi)..
and the answer to question b iii) is 90 (pi/2) .. why is this so?
Do u think my book has an error?View attachment 9240 is this correct? (Sorry for bad drawing)

before that tell me one thing, plz..do u take maths p3? differentiation part..?