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Physics: Post your doubts here!

A

azadii

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please someone post the physics As paper 2 of may june 2002 with mark scheme.i will very thankful for that. May Allah give all of us success
 
Soldier313

Soldier313

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azadii said:
please someone post the physics As paper 2 of may june 2002 with mark scheme.i will very thankful for that. May Allah give all of us success
Click to expand...

There you go.....
 

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Soldier313

Soldier313

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Oliveme said:
Can someone please explain this question? Question 7c) I don't understand at all why alternating current cause this to happen. Thank you. :)
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_41.pdf
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_ms_41.pdf
Click to expand...


Aoa wr wb,

Look, when you have a sinusoidal alternating current, it implies that the direction of currents in both of the wires keeps changing directions, and since the currents are in phase, it implies that they have currents flowing in the same direction at any particular time.

Now, the method to obtain the direction of force on wire B, is to use Fleming's Left Hand Rule. But before doing this, the direction of magnetic field experienced by wire B must be obtained by using Right Hand Grip Rule on wire A.
Since the currents are constantly changing, the direction of magnetic field will keep on changing.
However, the force on wire B will always be towards the left (towards wire A) because the direction of magnetic field AND the direction of current are both changing, hence your thumb will subsequently point towards wire A.
The force varies from '0' to a maximum value and the variation is sinusoidal, this is obvious since a sinusoidal alternating current is being applied.
The last statement in the marking scheme which states 'at twice frequency of the current' is what i still quite don't get.

Hope it helped :)
 
Sijal Mirza

Sijal Mirza

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can u please tell me what topics from physics come in the ATP paper? (O-level) like in chemistry its mainly just Acids, Bases n Salts , Rate of reaction and Moles..
PLEASE HELP!
 
syed1995

syed1995

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salvatore said:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s09_qp_2.pdf
No. 2 (b i).. it is a relatively simple question, but I'm kinda confused.
Change in momentum = momentum before - momentum after collision right?
So why did the marking scheme add the two velocities?

Please help me clear the doubt.. thanks!
Click to expand...


No. Change in momentum = final momentum - initial momentum = m(v-u)
taking <-- to be +

1.2(0.8) - 1.2(-4)
gives 5.76 Ns in the <-- direction as answer.

or if you take --> to be +

then

1.2(-0.8) - 1.2(4)
gives -5.76 Ns

the change is 5.76 Ns in <-- direction eitherway.
 
Oliveme

Oliveme

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Soldier313 said:
Aoa wr wb,

Look, when you have a sinusoidal alternating current, it implies that the direction of currents in both of the wires keeps changing directions, and since the currents are in phase, it implies that they have currents flowing in the same direction at any particular time.

Now, the method to obtain the direction of force on wire B, is to use Fleming's Left Hand Rule. But before doing this, the direction of magnetic field experienced by wire B must be obtained by using Right Hand Grip Rule on wire A.
Since the currents are constantly changing, the direction of magnetic field will keep on changing.
However, the force on wire B will always be towards the left (towards wire A) because the direction of magnetic field AND the direction of current are both changing, hence your thumb will subsequently point towards wire A.
The force varies from '0' to a maximum value and the variation is sinusoidal, this is obvious since a sinusoidal alternating current is being applied.
The last statement in the marking scheme which states 'at twice frequency of the current' is what i still quite don't get.

Hope it helped :)
Click to expand...
Thank you so much. It helped a lot. :)
JazakAllah Khairan.
 
salvatore

salvatore

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syed1995 said:
No. Change in momentum = final momentum - initial momentum = m(v-u)
taking <-- to be +

1.2(0.8) - 1.2(-4)
gives 5.76 Ns in the <-- direction as answer.

or if you take --> to be +

then

1.2(-0.8) - 1.2(4)
gives -5.76 Ns

the change is 5.76 Ns in <-- direction eitherway.
Click to expand...
I had got -5.76 Ns but thought that I'm wrong since the marking scheme gave 5.76 as the answer.
Thanks a lot :)
 
Soldier313

Soldier313

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Aoa wr wb,
Does anyone have ALL or most of the A2 formulas for physics compiled (preferably topic wise) ?
I'd b really grateful if someone could upload them.
Thank you :)
 
abruzzi

abruzzi

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EtKLvmD.jpg


Please help me solve this question.. I don't understand what to do.
Thanks :)
 
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