Physics: Post your doubts here!

[Asad Moosvi]

May someone explain Q6(d) to me from the following paper? http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s10_qp_22.pdf

 

[Silverglitter]

Can somebody explain the following questions answers in detail to me?
9702 May June 2013
Paper 21
Q6 part c and d
Thanks in advance!!!

 

[Silverglitter]

May someone explain Q6(d) to me from the following paper? http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_22.pdf

If you know how to do the rest of the question can you explain it to me?

 

[The Godfather]

help
3bi)ii)
http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w07_qp_2.pdf

 

[meerul264]

when S2 is closed the "path of least resistance" will take up most of the current
so the current would flow through S2 rather than through B cause here B has resistance
for (i) we use power= VI
we don't have I so we replace I with V/R which we take from the equation R=V/I
power=v^2/r
R=38.4
ii) they are talking about total poser
so if S1 open there is no power you get this one right because the circuit is not complete
S1 and S2 closed as i said current always takes easier path so it will not go through B so in P=IV I=O the P is also 0 for B but then the current flows through A so its 1.5k+0=1.5k
if all of them are closed here again we will take power of B as 0 and if you see we have A and C in parallel Total power=P1+P2......... SO 1.5+1.5
S1 is closed so so we have A and B in series 1/total power = 1/p1 + 1/p2 +............
so 1/total power= 1/1.5 +1/1.5
total power =0.75
here s1 and S3 are closed so we have A and B parallel to C ie (AB) parallel to C for parallel Total power=P1+P2.........
and we already found AB which is 0.75 so now we just need to add 1.5

nice, thanks

 

[Silverglitter]

help
3bi)ii)
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w07_qp_2.pdf

Q3 b part i First Calculate the height by which the ball is raised..use cos()
Then calculate the energy using mgh
part ii Calculate the moment by force x perpendicular distance
the perpendicular distance is found by sin()

 

[The Godfather]

Q3 b part i First Calculate the height by which the ball is raised..use cos()
Then calculate the energy using mgh
part ii Calculate the moment by force x perpendicular distance
the perpendicular distance is found by sin()

I solved it, anyways thanks a lot

 

[Asad Moosvi]

T

Stationary waves are different from progressive waves in a number of respects:
There is no energy transfer along a stationary wave.
Within a half wavelength (one loop of a standing wave) all the particles vibrate in phase and they are all exactly out of phase (180° phase difference) with all the particles in the adjacent loop.
View attachment 37948 View attachment 37948

The amplitude of vibration varies with position within the loop.
There are nodes where the displacement is always zero and antinodes that vibrate with the same maximum amplitude.
The wavelength of a stationary wave is twice the distance between two adjacent nodes or antinodes.
Neighbouring nodes or antinodes are separated by lamda/2.

Thank you for this!

 

[Asad Moosvi]

Can someone explain how a potentiometer works in general?
I would also like someone to explain Q 6 part d from this paper: http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s10_qp_22.pdf

Thank you in advance.

People are so helpful over here!

 

[Asad Moosvi]

If you know how to do the rest of the question can you explain it to me?

Do you not understand the whole question?

 

[Asad Moosvi]

Can someone explain how a potentiometer works in general?
I would also like someone to explain Q 6 part d from this paper: http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_22.pdf

Thank you in advance.

People are so helpful over here!

Anyone understand this? I would really appreciate it if someone could help me out here.

 

[Thought blocker]

T


Thank you for this!

Welcome

 

[Asad Moosvi]

Welcome

Hey, do you understand how potentiometers work? If you do, may you explain question 6 part d to me from:
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s10_qp_22.pdf

 

[Thought blocker]

Hey, do you understand how potentiometers work? If you do, may you explain question 6 part d to me from:
http://papers.xtremepapers.com/CIE/Cambriidge International A and AS Level/Physics (9702)/9702_s10_qp_22.pdf

Inbox me.. same link.. I will need some time I am busy though.

 

[asma tareen]

Potentiometer is another name for the potential divider as the name gives us the hint that it divides the potential difference ...,,about question 6 part d I think the voltage through both points is not same because the current flowing through them has also divide and isnt equal so thats y even if we connect it half way to AB the voltage wont be same :/ I think

Hey, do you understand how potentiometers work? If you do, may you explain question 6 part d to me from:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_22.pdf

 

[Asad Moosvi]

Potentiometer is another name for the potential divider as the name gives us the hint that it divides the potential difference ...,,about question 6 part d I think the voltage through both points is not same because the current flowing through them has also divide and isnt equal so thats y even if we connect it half way to AB the voltage wont be same :/ I think

In order to calculate the pd across AC, do we have to look at the current that passes through the ammeter or the wire AC itself? (I am confused.)

 

[Thought blocker]

In order to calculate the pd across AC, do we have to look at the current that passes through the ammeter or the wire AC itself? (I am confused.)

Well bro, I am not aware of your quesion, but to calculate pd, U need Current. But If you have other way then, do tell me.

 

[Asad Moosvi]

Well bro, I am not aware of your quesion, but to calculate pd, U need Current. But If you have other way then, do tell me.

Which current though?

 

[Asad Moosvi]

Well bro, I am not aware of your quesion, but to calculate pd, U need Current. But If you have other way then, do tell me.

For this particular question, do we need the current that passes through the ammeter or the current that passes through the wire AC? They would be different. These two currents would be less than the current that passes through CB. I think.

 

[Thought blocker]

For this particular question, do we need the current that passes through the ammeter or the current that passes through the wire AC? They would be different. These two currents would be less than the current that passes through CB. I think.

well, which question ?