Physics: Post your doubts here!

[Thought blocker]

i wanna join as i said you in school.. dont forget.

Sure!

 

[Champ101]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s10_qp_42.pdf

Q1(b)(ii), its the question on meteorite (Gravitation related sum )

im dont get it, from the graph, 2R corresponds to -3.1 J/g, but they are statin -2.1J/g .. please someone explain this!! :\

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s10_ms_42.pdf

 

[Suchal Riaz]

mahabaloch
s10 Q4(b)(ii)

each small square = 0.02mm * 2N = 0.04 mJ
count the small squares:
till 50 N there are 25*5=125 blocks
from 50-60 N there are 5*4=20 blocks
from 60-74 there are almost 15 blocks
total = 160 blocks
160 * 0.04 = 6.4 mJ
i know it is very tedious but this is how it has to be done. by counting blocks.

 

[***amd***]

View attachment 40788 Question 6a.. anyone please

***amd*** Suchal Riaz

i m not an A level student, but i guess the answer is NO.
becoz when a circuit gets closed, the electrons dont move from battery all around the circuit. but instead, the electrons present in the metallic wire start moving round the circuit at the same time. I mean, there is not a single wave of electrons running all round in the circuit. but, consider that instead of wires, we have a long round line of people. and when we close the switch, all the ppl just start walking round in the line.
so all the three bulbs would light at the same time.

hope you can understand it

 

[funky brat]

i m not an A level student, but i guess the answer is NO.
becoz when a circuit gets closed, the electrons dont move from battery all around the circuit. but instead, the electrons present in the metallic wire start moving round the circuit at the same time. I mean, there is not a single wave of electrons running all round in the circuit. but, consider that instead of wires, we have a long round line of people. and when we close the switch, all the ppl just start walking round in the line.
so all the three bulbs would light at the same time.

hope you can understand it

I think it's right. (Y).
I'm too not an A'level student.

 

[Suchal Riaz]

examiner can ask why both bulbs will light at same time.
as soon as the circuit is closed an electric fields will travel through out the circuit. as the speed of electric field is highest possible speed possible(speed of light) both bulbs light up instantly.

 

[yuv2404]

hi can someone explain to me how to do question 1 b (ii)
http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w07_qp_4.pdf

 

[sma786]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s07_ms_2.pdf

2 (d) please

 

[usama321]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s07_ms_2.pdf

2 (d) please

Particle has no vertical velocity initially. We also know that when a force is perpendicular to the direction of motion, the acceleration produced does not affect the velocity of the object, rather just changes its direction.

From the previous part we know that the time the particle takes to move a horizontal distance of 12 cm. Use that time, and use s = 1/2 a t^2 (no initial vertical speed of particle so ut = 0)
It gives us s = .71cm. Thus the particle only travels .71cm vertically. As it is moving through the middle of the plates, the minimum vertical distance it has to travel to collide with the plate is .75cm. Thus, it doesn't collide with the plate.

 

[sma786]

Particle has no vertical velocity initially. We also know that when a force is perpendicular to the direction of motion, the acceleration produced does not affect the velocity of the object, rather just changes its direction.

From the previous part we know that the time the particle takes to move a horizontal distance of 12 cm. Use that time, and use s = 1/2 a t^2 (no initial vertical speed of particle so ut = 0)
It gives us s = .71cm. Thus the particle only travels .71cm vertically. As it is moving through the middle of the plates, the minimum vertical distance it has to travel to collide with the plate is .75cm. Thus, it doesn't collide with the plate.

Okay got it! Thankyou so very much

 

[sma786]

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

Question 3, b(ii).. Got the two equations, but what to do after that? :\

 

[Mohammed salik]

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

Question 3, b(ii).. Got the two equations, but what to do after that? :\

I would give You detailed Explaination now...

P=Pressure, A=Area, F=Force,D=Density,V=Volume,M=Mass, g=Gravity,H=Height

P=F/A
M=D*V
W=M*G
W=D*V*g V=AH
W=D*A*H*g
W=F
P=F/A SO D*A*H**g/A
H cancel out to give
P=D*g*h!

Hope u Do understand! if not Then i would write down and Explain!!

 

[sma786]

I would give You detailed Explaination now...

P=Pressure, A=Area, F=Force,D=Density,V=Volume,M=Mass, g=Gravity,H=Height

P=F/A
M=D*V
W=M*G
W=D*V*g V=AH
W=D*A*H*g
W=F
P=F/A SO D*A*H**g/A
H cancel out to give
P=D*g*h!

Hope u Do understand! if not Then i would write down and Explain!!

Thankyou
I understood it very well

 

[Mohammed salik]

Thankyou
I understood it very well

Ur Welcome!!
With lots of !!

 

[sma786]

Ur Welcome!!
With lots of !!

Haha

 

[Abdulaziz T]

T

yes !!

Thaankss

 

[axetreme.O]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s08_qp_5.pdf
how to calculate uncertainties of lnR in second question(The table).... NOTE :absolute uncertainties have to be calculated.

here's the mark sheme...
http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s08_ms_5.pdf

 

[Mohammed salik]

Haha

!

 

[mahnoor wadood]

Can anyone please tell me the guess questions for paper 2 paper 4 and 5 for May June 2014 session?

 

[axetreme.O]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s08_qp_5.pdf
how to calculate uncertainties of lnR in second question(The table).... NOTE :absolute uncertainties have to be calculated.

here's the mark sheme...
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s08_ms_5.pdf