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Physics: Post your doubts here!

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Hey ppl in paper 2 sometimes there is a number involving estimates of certain things for e.g the mass of a protractor- 10 g
could someone just list some quantities whose value must be learnt
there are no specific quantities that should be learnt as i have been told ....i think you just have to guess them and i think its just stupid
 
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Can someone Please Please Please answer my Question's :(:cry: (it got ignored 3 times)

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_23.pdf
7bii) I don't get why charged particle is not an isolated system

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_13.pdf
29) I just don't understand the question, I looked at examiners report and it said that the lines R to S has a constant phase difference


I will thank you a lot :)

for question 7bii : its very easy . if you were able to solve 7 part a then part b is just continuation. ok we know that change in momentum (delta)P= F x (delta) t
so just substitute part a ii for delta P .
you already got F= Eq , and t= L/v ...........so , (delta P = F.t )
that is P= EqL/v as simple as that !

for question 29 ; interference pattern is observed on the viewing screen which if you think more about the diagram is XY. so answer is C !! you dnt need to calculate or think about phase relationship ! :)
 
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Sorry, but what is the likelihood of a question being repeated in O/N this year that appeared in either may/june of this year or in either both sessions last year?
 
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qp: http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s09_qp_2.pdf

ms: http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s09_ms_2.pdf

question 2, how do you find the ke after for ball B, isnt the speed of separation 0.8, then why in the world does the ms say 2.4 ? feeling like an air head!

THANKS!

speed of separation is actually difference in velocities of ball S and B . velocity of B = -0.8 , and Velocity of S= 1.6
so, 1.6 - (-0.8) = 2.4 (y)
 
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I know noting bout vectors.......:cry:
i know only a couple of formulae: Fx=F cos theta , Fy=F sin theta
need help
 
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