Physics: Post your doubts here!

[areeba240]

9702/w16/51
qtn 2 how to make the error bars
will it be horizontal or vertical as usual....how to do it can anyone plzz show
can someone plzz solve the complete qtn 2

 

[Laveeza]

Plz help me with question 26
Answer is d

 

[Laveeza]

Question 26 plz help

 

[Shuddho Ukil]

Conceptual problem! Help please.
This is a made up question to illustrate my problem. Any help would be greatly appreciated.

Suppose a particle travels in a straight line from point A to point B, and then returns to point A. For both parts of the journey, the deceleration is 8m/s2. So, when using the equations of motion, I will consider a = -8m/s2, if I'm not wrong. So for the return journey, the acceleration would once again be -8m/s2 but due to direction change, would we use -(-8), i.e +8, in the equation?

 

[Shuddho Ukil]

http://physics-ref.blogspot.in/2015/01/physics-9702-doubts-help-page-48.html
See Q two eighty eight

I appreciate the help, but, I could't understand the explanation on the site. Would you or anyone else mind giving an explanation?
Thank you so much though.

 

[silver slick]

 

[silver slick]

View attachment 61887 View attachment 61888

can anyone please explain the b (ii)

 

[Thought blocker]

can anyone please explain the b (ii)

T prop to mean sq speed. use that... to solve

 

[student2]

cn any1 pls pls post a picture of their graph fr physics p5 of the following yrs:
MJ 11 51
ON 09 51
Any helpwud b greatly appreciated

 

[Bishnu Dev]

Can someone explain this to me please?

 

[sushmita33]

hi does anyone have access to physics past paper of 1997 and its ms?

 

[dannyboy123]

Can someone explain the answers to these questions?
The answers are q12)A
EDIT- q9 can be ignored as I found the answer.

for question number 12 you have to take account the fact that moment is conserved and since they stick together their masses will be greater (thus added).
Continuing use this formula m1*v1+m2*v2=(m1*m2)*v
so lets take common mass for both of them ex:20 <------ it doesnot matter what masses you take the answers will be the same
so 20*60+-(20*30)=(20+20)*v <-------------- negative because going in the opposite direction (velocity is a vector)
then change the subject to find v and you'll get the answer 15 which is a
note: you can use the formula when ever the question says that the objects stick together

 

[i_try9621]

Hey in P5 Q1), Is it necessary to fill the out the whole page ?

 

[krishnapatelzz]

Hey in P5 Q1), Is it necessary to fill the out the whole page ?

you should write as much as u can, explain the experiment in the detail , it normally fills all the space but you should include the main points , check the syllabus where it shows how much marks you gain for writing particular things . The syllabus has changed slightly for papers of/ after 2016 , eg now maximum marks you can get in defining the problem is 2 which used to be 3 . so go through the markscheme and see how much you have to write . when i used to do it usually filled all the space .

 

[krishnapatelzz]

hi does anyone have access to physics past paper of 1997 and its ms?

why do you need to solve that old paper ! from 2002 you can solve, which are available on gceguide .

 

[krishnapatelzz]

9702/w16/51
qtn 2 how to make the error bars
will it be horizontal or vertical as usual....how to do it can anyone plzz show
can someone plzz solve the complete qtn 2

it will be horizontal , it says show error bars for X (it is in x-axis ). for thing like this try to understand rather than remembering things . there is uncertainty in the value of X so we draw error bars to show the maximum or minimum value it can go from the accurate value .

 

[Holmes]

Explain why the answer is D
Thanks in Advance

 

[kungfuPanda]

Hi
Can you guys help me out with paper 3 ,I have a simple question.
What do i have to keep in mind while taking readings from instruments?
Like measuring masses or time ,Is it always good to round off numbers during measurements for final readings at the start of Question 1 or 2 ?

 

[areeba240]

9702_w12_qp_43
qtn 7 b(ii)
can anyone plzz explain me this

 

[krishnapatelzz]

9702_w12_qp_43
qtn 7 b(ii)
can anyone plzz explain me this

if u remember in AS the wave chapter , for a visible fringe to be seen the wavelength of light should be almost equal to the slit space . so here the electron is replaced with light and the crystal acts like a slit as it has space between them , the space(separation of crystal ) is about the size of wavelength so can be used in electron diffraction.