Physics: Post your doubts here!

[Batguy]

http://onlineexamhelp.com/wp-content/uploads/2013/09/9702_s13_qp_12.pdf

can anyone help me with number 9? how is it 16000N?

Hint:
try to convert things into Si units en make a formula of Kg/S
multiplying Speed , density , area gives u Mass /second units thats all wat u need!! Multiply all those quantities.......then put formula
F=ma
F=m*(v-u)/t (here just focus mass per unit time ,the answer u had before)
V (v=33)
f=475.2*(33) =15681.6 approx answer!!!
(D) answer
(i sick in teaching skills)

 

[Ishrar Afrida]

pressure=p(density) mutliply velocity^2 as u get the pressure use formula pressure mutiply area =force formula to get the right answer

Thanks sameen I just didn't know this formula!
And hey can you help me with number 14 as well?

 

[Ishrar Afrida]

Hint:
try to convert things into Si units en make a formula of Kg/S
multiplying Speed , density , area gives u Mass /second units thats all wat u need!! Multiply all those quantities.......then put formula
F=ma
F=m*(v-u)/t (here just focus mass per unit time ,the answer u had before)
V (v=33)
f=475.2*(33) =15681.6 approx answer!!!
(D) answer
(i sick in teaching skills)

I seriously didn't get you! why would I multiply everything randomly lol

 

[sameen saeed]

Thanks sameen I just didn't know this formula!
And hey can you help me with number 14 as well?

first of all convert the masses in kilograms to newtons as forces r in newtons then use the formula force * perpendicular distance to calculate moment of each force from pivot.Use idea sum of anticlockwise moment =sum of clockwise moment to calculate the remaining moment needed to balance.This will give u ans

 

[Faaiz Haque]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s10_qp_21.pdf

Q4 - B (Explain your calculations please)
Q4 - C


http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s11_qp_21.pdf
Question 7 C i and ii
Mark scheme just says correct lines labelled, lol.

 

[Thought blocker]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s10_qp_21.pdf

Q4 - B (Explain your calculations please)
Q4 - C


.

Answer was uploaded!

View attachment 40338

View attachment 40339

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s11_qp_21.pdf
Question 7 C i and ii
Mark scheme just says correct lines labelled, lol.

The question 7 is left, Suchal Riaz

 

[Hadi Murtaza]

Thanks sameen I just didn't know this formula!
And hey can you help me with number 14 as well?

i can help u in dat

 

[sara kamal]

(j) describe practical examples of forced oscillations and resonance
(k) describe graphically how the amplitude of a forced oscillation
changes with frequency near to the natural frequency of the
system, and understand qualitatively the factors that determine
the frequency response and sharpness of the resonance
(l) show an appreciation that there are some circumstances in which
resonance is useful and other circum

can anyone explain me these points in syllabus from chapter simple harmonic motion(A2)?thanks in advance!

 

[Suchal Riaz]

Answer was uploaded!






The question 7 is left, Suchal Riaz

 

[Faaiz Haque]

Suchal Riaz thanks a lot man!

One question about 4 B
View attachment 40338

How do we know n = 1?

 

[sweetjinnah]

The answer for N is correct, but the equation does not solve it. Could you see this too?

 

[Hadi Murtaza]

View attachment 40429

where is da question ?

 

[sweetjinnah]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_42.pdf

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_ms_42.pdf


Q 5 c (ii)

I just don't get it -_-

 

[sweetjinnah]

where is da question ?

somwhere above

 

[sweetjinnah]

where is da question ?

M/J 2005 Q7c
http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s05_qp_4.pdf

 

[daredevil]

View attachment 40430

how did u reach B0/Bn = mo/mn ??

 

[sweetjinnah]

Can u inbox me ?

edited my reply check

 

[sweetjinnah]

how did u reach B0/Bn = mo/mn ??

Bo= mov/qr nd Bn= mv/qr ..v , q nd r are same so they cancel each other..

 

[A star]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w12_qp_43.pdf Q8b(i) why did they take the rest mass different for proton and neutron when in the data sheet they have given only one value

 

[RoyalPurple]

papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s13_qp_21.pdf

Q5 (c) how do we know that a maxima is observed at point P?