Physics Paper 5 tips

[Arooba Mahboob]

hey! can anyone plz tell me how to calculate absolute uncertainties??

 

[TaffsAsLevel]

How do you draw the diagram for november 2010 paper 51? Please help

 

[fb.junks]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_53.pdf
Q2 e part please

V=V0e^-t/CR
.10Vo=V0e^-t/CR(AS 10% of original potential difference)
ln(.10)=-15/CR (V0 eliminated on both sides)

Uncertainty of R=(Uncertainty of C/C )xR

 

[fb.junks]

hey! can anyone plz tell me how to calculate absolute uncertainties??

Can u please specify a question????

 

[Arooba Mahboob]

Can u please specify a question????

like if we have to calculate absolute uncertainty of R^2 where R=4 +/- 0.05 so how would we do that??

 

[nishan2052]

like if we have to calculate absolute uncertainty of R^2 where R=4 +/- 0.05 so how would we do that??

2*delta R*R
ans is 0.4

 

[nishan2052]

when we divide quantity by something.what will be the uncertainty of new value? mj/10/52 question number two.plz someone help

 

[chocolatelover]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s12_qp_51.pdf
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s12_ms_51.pdf
Q1. How do we change the speed of the rotating device?

 

[fb.junks]

when we divide quantity by something.what will be the uncertainty of new value? mj/10/52 question number two.plz someone help

Can u specify the part????
In general for division fractional error is used

 

[fb.junks]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s12_qp_51.pdf
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s12_ms_51.pdf
Q1. How do we change the speed of the rotating device?

By speed of motor can be changed by changing voltage by using variable resistor I suppose.

 

[nishan2052]

Can u specify the part????
In general for division fractional error is used

please see mj 10/52 question number 2

 

[fb.junks]

please see mj 10/52 question number 2

Which part ????

 

[fb.junks]

Which part ????

please see mj 10/52 question number 2

Got your question!!!!!!!!!!!
Error in T=(error in t/t)xT (10 is constant so has no error)
For error of T^2=(2(error in T/T))xT^2

 

[TaffsAsLevel]

like if we have to calculate absolute uncertainty of R^2 where R=4 +/- 0.05 so how would we do that??

Easy, 2x(deltaR)/R then multiply that by the value on R^2 which is 4^2=16

 

[TaffsAsLevel]

Some details about the components are confusing sometimes when it is actually simple after we found out, I now only thought a photocell is actually just an LDR.

 

[Trash Can]

are the error bars for x-axis horizontal???should they be treated as normal vertical ones or they have some special method to solve?????plzz help my exam is at tomorrow morning..not even 24 hrs left..plzzz help!!!

 

[Silent Hunter]

Some details about the components are confusing sometimes when it is actually simple after we found out, I now only thought a photocell is actually just an LDR.

whats it symbol ?

 

[notebook]

how to calculate v in o/n/11/53 q2??

 

[TaffsAsLevel]

whats it symbol ?

I am not answering to that, how can you not know the symbol of LDR?

 

[Silent Hunter]

I am not answering to that, how can you not know the symbol of LDR?

okay .... i got it .... sorry abut that ....