Physics: Post your doubts here!

[raamish]

what is the difference b/w path diff and phase diff??

 

[angelicsuccubus]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_21.pdf

5c) The arrow will be pointed up and down in a somewat curved direc. yes?
Why are we resolving the distance. why cant we take out the answer without resoolving the distance?

I didnt check the markscheme but how can distance be resolved? Forces are resolved. I'll leave Jaf to asnwer this cause what's in my head might be wrong..

 

[angelicsuccubus]

Jaf http://www.thestudentroom.co.uk/showthread.php?t=430543 ... so do we draw it after T1 or before?

 

[knight101]

t= 0.35 +/- 0.01

can anyone tell me how to calculate the uncertainty in t^2 ? last time I did this I was in AS so i forgot :/

 

[Jaf]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_21.pdf

5c) The arrow will be pointed up and down in a somewat curved direc. yes?
Why are we resolving the distance. why cant we take out the answer without resoolving the distance?

No, of course not.
There's a couple being created; how in the world will the arrows be curved?

Both arrows are parallel to the direction of the field. The arrow from P point in the direction of the field. The arrow from N points in the opposite direction. The reason is that the right end is negative (hence the direction of the field from left to right) and the unlike charges attract.
I asked my teacher today if the particles will continue to move until they line up along the direction of the field and she said no because we don't know if there's a large enough force being created by the electric field to achieve sufficient rotation.

We don't necessarily have to resolve the distance. The force can be resolved too and you'll get the same answer.

Jaf http://www.thestudentroom.co.uk/showthread.php?t=430543 ... so do we draw it after T1 or before?

After. It's kind of hard to explain why. :S

 

[angelicsuccubus]

No, of course not.
There's a couple being created; how in the world will the arrows be curved?

Both arrows are parallel to the direction of the field. The arrow from P point in the direction of the field. The arrow from N points in the opposite direction. The reason is that the right end is negative (hence the direction of the field from left to right) and the unlike charges attract.
I asked my teacher today if the particles will continue to move until they line up along the direction of the field and she said no because we don't know if there's a large enough force being created by the electric field to achieve sufficient rotation.

We don't necessarily have to resolve the distance. The force can be resolved too and you'll get the same answer.

After. It's kind of hard to explain why. :S

That's what I thought about the forces on P and N exactly but wasn't gonna risk it..

And I do get what you're saying about the lag thing.. but these people are debating over it.. and the "model answer" booklet I have for these past papers.. has it drawn before T1..

 

[Jaf]

And I do get what you're saying about the lag thing.. but these people are debating over it.. and the "model answer" booklet I have for these past papers.. has it drawn before T1..

What?! Picture!

 

[raamish]

No, of course not.
There's a couple being created; how in the world will the arrows be curved?

Both arrows are parallel to the direction of the field. The arrow from P point in the direction of the field. The arrow from N points in the opposite direction. The reason is that the right end is negative (hence the direction of the field from left to right) and the unlike charges attract.
I asked my teacher today if the particles will continue to move until they line up along the direction of the field and she said no because we don't know if there's a large enough force being created by the electric field to achieve sufficient rotation.

We don't necessarily have to resolve the distance. The force can be resolved too and you'll get the same answer.

After. It's kind of hard to explain why. :S

So in couple the arrows will always be parrallel u say?The arrows will be left and right or up and down.And why didnnt we take cos to resolve.

 

[Jaf]

So in couple the arrows will always be parrallel u say?The arrows will be left and right or up and down.And why didnnt we take cos to resolve.

Yeah.

Because then it'd be wrong. I can't explain trigonometry here.

 

[angelicsuccubus]

What?! Picture!

https://www.dropbox.com/s/99v0fofgh63zzu5/IMAG0323.jpg
sorry about the orientation of the pic

 

[Soldier313]

i got the answer now bro nevermiindd haha

am not a bro:/ lol

 

[iKhaled]

am not a bro:/ lol

ahhh sorry sister! better now?

 

[Jaf]

https://www.dropbox.com/s/99v0fofgh63zzu5/IMAG0323.jpg
sorry about the orientation of the pic

I'm quite sure it's wrong.
See for example the last paragraph and the corresponding graph here (I know it's about the pendulum but the concept is the same):
http://tap.iop.org/vibration/progressive/310/page_46654.html

 

[iKhaled]

need brief explanation for question 4 in oct nov 2005

http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w05_qp_2.pdf

 

[Soldier313]

ahhh sorry sister! better now?

lol thanx that's better

 

[angelicsuccubus]

I'm quite sure it's wrong.
See for example the last paragraph and the corresponding graph here (I know it's about the pendulum but the concept is the same):
http://tap.iop.org/vibration/progressive/310/page_46654.html

hmm okay.. I just looked at the markscheme though and it says "lags behind T1" .. I really hope that means we draw it after T1..

 

[Most_UniQue]

What are the observations?

View attachment 11128

Someone answer this please

 

[geek101]

can someone explain 1 cii http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s06_qp_2.pdf thanks a bunch!

 

[Drift_king]

is anybody is having any links or revsion notes of AS physics.....???????

 

[Yousuf Ykr]

Please someone solve Q.4 d (i) and (ii)

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s07_qp_2.pdf

With explanation and diagram of-course. Thank you!

Here is the pic and hope it helped you...If it helped you then can you help me with few of my probs?

m/j 2007- 5b (ii)
m/j 2011 21- 2c(i) 5 (ii)b
m/j 2011 22 5b(ii) 6(ii)1