Physics: Post your doubts here!

[Someone2]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s10_qp_42.pdf
help on questions 3(b) and 4(c) needed!!

 

[TheJDOG]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w12_qp_12.pdf
Help would be appreciated!
Question 20 and 29
Thanks!

Hello there, for Q20, it is given that a train has mass of 1200 tonnes, which is 1.2 x 10^6 kg.
It is given that u=0 and v=75m/s
We know that Work=Deltra KE
So work= 1/2 m x v^2= 1/2(1.2 x 10^6) x 75^2= 3.4 x 10^9 J

For Q29,
It is given that Speed=330m/s
We can see that 4 heaps of dust are 0.30 meters apart.
If you look carefully, youll know that between these 4 heaps of dust, theres 1.5 lambda.
But we need to use 1Lambda.
So 0.30m-->1.5Lambda
?m-----> 1Lambda

So lambda= 0.2m

Speed equation of waves is V=Lambda x frequency

F=330/0.2=1650 Hz

 

[Thought blocker]

Adeena Shamshir

 

[Mohammed salik]

max time =
0 = 16 -9.81*t
t = 1.631s
t/2 = .815s
speed = 8 m/s
KE = 32m
s = ut -1/2gt^2
s =9.78m
Gp energy = 96m
96/32 = 3

Could You Plz explain How did u Find out Max time :/?

 

[Thought blocker]

Could You Plz explain How did u Find out Max time :/?

V = U - gt
Zero = 16 - 9.8t
-16/-9.8 = t
t = 1.632
put t as t/2 hence divide 1.632 by 2 that will end up to 0.815 secs

 

[Thought blocker]

May this helps you all
LATEST ESTIMATES
Haya Ahmed

 

[MiniSacBall]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w09_qp_21.pdf

Q5 c)
Any body please draw a rough diagram, i just want to get an idea about such question, could you please answer this whole question and show me.
Thanks,

 

[Mohammed salik]

May this helps you all
LATEST ESTIMATES
Haya Ahmed

Wow..! This is Awesome? Hw did u Do This?
Goggled all those stuff?

 

[Thought blocker]

Wow..! This is Awesome? Hw did u Do This?
Goggled all those stuff?

XPC stuffs

 

[Mohammed salik]

XPC stuffs

Thanx Anyways !

 

[omaaaar]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w08_qp_2.pdf
Q7 b part full

 

[princeali97]

Mohammed salik

 

[sma786]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s11_qp_21.pdf

Question 1 part c(ii).. the markscheme ( http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s11_ms_21.pdf ) says that for area's uncertaininty, we have to multiply 2 as well.. Why do we multiply 2?

 

[princeali97]

Suggest two reasons why b-particles from a radioactive source would be inappropriate
for this type of scattering experiment.

 

[TheJDOG]

Suggest two reasons why b-particles from a radioactive source would be inappropriate
for this type of scattering experiment.

Which type of scattering experiment? What do you mean? lol

 

[princeali97]

Which type of scattering experiment? What do you mean? lol

The results of the a-particle scattering experiment provided evidence for the existence and
small size of the nucleus.
The a-particles in this experiment originated from the decay of a radioactive nuclide.
Suggest two reasons why b-particles from a radioactive source would be inappropriate
for this type of scattering experiment.Yeah this is the question.Now solve. -___-

 

[AhsanAfzal]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s13_qp_23.pdf
Q6 (c) (ii) explain this
shouldnt pd remain same in parallel and series arrangement across R2when R1 is zero

 

[Mohammed salik]

The results of the a-particle scattering experiment provided evidence for the existence and
small size of the nucleus.
The a-particles in this experiment originated from the decay of a radioactive nuclide.
Suggest two reasons why b-particles from a radioactive source would be inappropriate
for this type of scattering experiment.Yeah this is the question.Now solve. -___-

Smart Question
Beta has Range of Energies and it also Has high speed and Would be Deflected by Electrons in Orbitals? How many marks for This question?

 

[Haya Ahmed]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s13_qp_22.pdf

Q2 (b) i and ii
and
Q5 b (iii)


Please someone Help ! thanks !

 

[Thought blocker]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s13_qp_22.pdf

Q2 (b) i and ii
and
Q5 b (ii)


Please someone Help ! thanks !

Q5bii) was a piece of a cake so here you go, Q2 needs a bit of thinking which I can't afford it. As I am doing comp
Hope it helps