ALL CIE PHYSICS DOUBTS HERE !!!

[elemis]

-Can someone tell me how the percentage uncertainity determines the number of significant figures???
A simple question on this was on June 2003 Question 5...
-And on paper 3 practicals, can we use a FO and calculate c from the eqn by substitution?
WHen do use s.f and d.p in our table of results?
Thanks ...

What's an FO ?

[SkyPilotage]

What's an FO ?

A False Origin meaning not to start the x-axis from 0 to find the y-intercept... I find it in the markscheme "If not 0, Mark as FO" My question is tht sometimes my scale wont fit if i start from zero!?

[$H00t!N& $t@r]

question! o/n 2007 q5a

Here is the link: http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_w07_qp_2.pdf

[Master_Key]

question! o/n 2007 q5a

Here is the link: http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_w07_qp_2.pdf

The Graph has amplitude of 10 boxes.

Intensity is directly proportional to (amplitude)².

I = 10² = 100.

0.5 I = (10²)/2 = 50

I = sq. root of 50.
 = 7.07

therefore the amplitude will be 7 boxes.

Phase difference is 60 degrees.

So 5 boxes of difference between waves. Got this by calculation.

HOPE IT HELPS.

[Vin]

The Graph has amplitude of 10 boxes.

Intensity is directly proportional to (amplitude)².

I = 10² = 100.

0.5 I = (10²)/2 = 50

I = sq. root of 50.
 = 7.07

therefore the amplitude will be 7 boxes.

Phase difference is 60 degrees.

So 5 boxes of difference between waves. Got this by calculation.

HOPE IT HELPS.

Can you please explain how 5 boxes? I get 10, actually :/ Which's wrong, I know.

[Master_Key]

Can you please explain how 5 boxes? I get 10, actually :/ Which's wrong, I know.

Calculate the distance between 2 Crest

X boxes = 360 degrees.

Calculate for 60 degrees.

SHORTEST, SIMPLEST AND EASIEST WAY.

[Arthur Bon Zavi]

Can you please explain how 5 boxes? I get 10, actually :/ Which's wrong, I know.

Take the first crest.

15 boxes gives you a phase difference of 180^o;
So a phase difference of 60^o will be given by :

( 60 X 15 ) / 180 = 5

[$H00t!N& $t@r]

The Graph has amplitude of 10 boxes.

Intensity is directly proportional to (amplitude)².

I = 10² = 100.

0.5 I = (10²)/2 = 50

I = sq. root of 50.
 = 7.07

therefore the amplitude will be 7 boxes.

Phase difference is 60 degrees.

So 5 boxes of difference between waves. Got this by calculation.

HOPE IT HELPS.

Thanks 

[muskaan]

june02/ppr 4/

Q6/b/part 3..how does capacitor does smoothing? (explain de concept plz)
Q2/b..isnt workdone takn positive whn vol increases?

[Master_Key]

june02/ppr 4/

Q6/b/part 3..how does capacitor does smoothing? (explain de concept plz)
Q2/b..isnt workdone takn positive whn vol increases?

Q2/b.. U = W + Q. Energy is needed for boiling so Q is positive. Take all values for "change of/delta".

Q6/b/part 3..

V_rms = 0.707 * V_max
V_rms / 0.707 = V_max

Or equivalent

V_rms * Sq.rt. 2.

[mmanikandan]

hello all =
just been two days i started physics degree and so i have some  doubts


so my first doubt,


Q1.When you whistle out air, on to your palm held close to your mouth the air fills cold but, when you blow out air from your mouth keeping it wide open the air feels hot why?

[EMO123]

 
cauz of hollowness

[HUSH1994]

because when you open your mouth wider you force more air to come out in a faster rate,i guess thats why

[aloha32]

Hello

I have major doubts regarding CIE Physics Paper 4 Nov 10 Variant 3 : question 3 part b (ii) and (iii) how do you know how high it is above the piston with the angle?

and also question 2 part ii ; why have they taken 1.2E-12 instead of the total kinetic 2.4E-12 Joule?

[Sue T]

i answered ur first question on the last post of this : https://studentforums.biz/sciences-149/physics-paper4/

the second thing u asked - i think bcuz that eqn applies for a single molecule u have to take only half th kinetic energy since a mixture of those two contains two molecules and assuming both have the same kinetic energy, u divide by 2 as to put in just a single molecule in ur eqn (i thought bout it alot n ths s th best i cod come up wth - sometimes th information is soo less...)