Physics: Post your doubts here!

[Dr Death]

can someone explain y the right answer is not C instead of B

No Kinetic energy is lost in a perfectly elastic collision

Therefore Speed of approach = Speed of projection

Momentum AND total energy is ALWAYS conserved

 

[Mahnoorfatima]

check at
http://physics-ref.blogspot.com/2014/06/9702-june-2012-paper-12-worked.html

Why don't you have the paper 11's or 13's of 2012 and backwards? :/ Where am i supposed to find those?

 

[Dr Death]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_11.pdf
Question 6 ,20, 38 any one? ;/

When ball is sliding down the slope then as there is acceleration, velocity is increasing (first part of graph).
When ball is going on horizontal surface, constant velocity.
When ball collides with wall then direction of velocity is changed.
As inelastic K.E is lost.
Velocity is lost.
Ball slides a small way up before stopping

 

[Mahnoorfatima]

When ball is sliding down the slope then as there is acceleration, velocity is increasing (first part of graph).
When ball is going on horizontal surface, constant velocity.
When ball collides with wall then direction of velocity is changed.
As inelastic K.E is lost.
Velocity is lost.
Ball slides a small way up before stopping
View attachment 51353

Then what's the difference in the other options?

 

[Mahnoorfatima]

check at
http://physics-ref.blogspot.com/2014/08/9702-november-2011-paper-12-worked.html

I did but what i don't get is when do we need to use this equation. Is there a specific cricuit in which this potential divider equ is used ?

 

[Mahnoorfatima]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_11.pdf
In q 24 why is A wrong???
And I DONT get question 28!

 

[manya]

No Kinetic energy is lost in a perfectly elastic collision

Therefore Speed of approach = Speed of projection

Momentum AND total energy is ALWAYS conserved

oh thankyou so much. i guess i didnt read the elastic collision part carefully

 

[princess Anu]

Can somebody explain why d and not c? please

 

[Mahnoorfatima]

Just a general thing: Are giving Mocks necessary. What if we don't give mocks?

 

[The Godfather]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_11.pdf
In q 24 why is A wrong???
And I DONT get question 28!

24: By knowing area under Force - extension graph is the energy stored in the material answer is B.
28: YEt not done in my course. Sorry.

 

[The Godfather]

Can somebody explain why d and not c? pleaseView attachment 51356

Q481 : http://physics-ref.blogspot.in/2015/03/physics-9702-doubts-help-page-93.html

 

[princess Anu]

Is it true that for a projectile not travelling in air, the angle of launch is equal to the angle of strike?

 

[Mahnoorfatima]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_13.pdf
Question 10,15,19 PLEASE!

 

[Mahnoorfatima]

And whenever the resultant torque is 0 the resultant force has to be 0 whatsoever?

 

[Talha Jameel]

Besides the formula sinI/sinR, what actually is 'refractive index' ?

 

[princess Anu]

can somebody explain these three questions.
Answers:
22.A, 23.B,24.A

 

[totalljerkface]

can somebody explain these three questions.
Answers:
22.A, 23.B,24.A
View attachment 51368View attachment 51369

What paper is that?? cie??? ocr

 

[princess Anu]

it's from IB

 

[Bba321]

In qs 9 part http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s11_qp_41.pdf

Qs 9 part b 1 I know the resistance of thermistor os 2.5kohms but what about x?

 

[Muskan Achhpilia]

Hey,
Can someone help me out with the following mcqs all are from 2002 summer paper.I have written the answers too.

Ans D


Ans B


Ans C


Ans A


Ans C


Ans C

Thank you very much!