Edexcel Unit 2: Physics at Work ~9th June 2014

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Reply 580

Navo D.

Anyone got a rough list of potential topics that might come up tomorrow?

Reply 581

Karoel

Original post by AG Singh

When attempting question on DC electricity. which direction of flow should we use in the exam? conventional or the true flow?

You can go with either, just the book says that you need to stick to the one you use. I think I'd go for electron flow.

Reply 582

Ripper Phoenix

june 2013 last question last part last page.. why on earth does the resistance decrease? from R=V/I r is inversely proportional so shouldnt resistance increase..

http://www.edexcel.com/migrationdocuments/QP%20GCE%20Curriculum%202000/June%202013%20-%20QP/6PH02_01_que_20130605.pdf

Reply 583

ThatGirlx

I've got a feeling there's going to be a ton on electricity tomorrow :frown:

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=S someone please?

Original post by Paras Agarwal

Ohms law is only true for ohmic conductors at constant temperature. Here current alters temperature so normal rules don't apply. Lattice vibrations have an overriding effect.

Reply 586

Kaneda

Original post by AG Singh

When attempting question on DC electricity. which direction of flow should we use in the exam? conventional or the true flow?

no no no!!! always go with the conventional flow just think where an isolated positive charge would flow because you will need that in A2 !!!!
A2 is all about conventional flow because you will be applying rules which use conventional flow

Reply 587

PBatch

Original post by arshia

=S someone please?

Distance = Speed x Time = 0.24*10^-3 x 3.0*10^8 = 7.2*10^4. Remember this is the distance to the mirror AND back. Therefore the real distance is 7.2*10^4 / 2 = 3.6*10^4 !!

Reply 588

Kaneda

Original post by ThatGirlx

I've got a feeling there's going to be a ton on electricity tomorrow :frown:

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how comes?

Reply 589

Wannabe007

Original post by ThatGirlx

I've got a feeling there's going to be a ton on electricity tomorrow :frown:

Posted from TSR Mobile

Same here, I've practised but it just doesnt seem to be enough :/

Reply 590

13142vp

guys looking at unit 1, I predict that some sort of scale diagrams/drawings will come up in unit 2 too
and some big questions on electricity/ultrasound

Reply 591

13142vp

Original post by arshia

=S someone please?

(speed x time)/2

Reply 592

AdilMalikN

Original post by Lewisallows

http://www.mediafire.com/view/w3sp9plh6097j30/WPH02_01_msc_20140306.pdf

Quite high boundaries!
And a lot of writing questions!!

I just this did, it was alright i guess. Whats were the grade boundaries? for an A?

Reply 593

PBatch

Original post by AdilMalikN

I just this did, it was alright i guess. Whats were the grade boundaries? for an A?

54. Fairly average imo

Reply 594

Ripper Phoenix

jan 14 question 10 guys? please?

Reply 595

AdilMalikN

Original post by Paras Agarwal

jan 14 question 10 guys? please?

that one got me too, damn! But its easy if you think about it, the PD across terminals is the same as the PD across R. PD across R is given by Current * R, so (e/r+R) * R...

Reply 596

arshia

Original post by pbatch

distance = speed x time = 0.24*10^-3 x 3.0*10^8 = 7.2*10^4. Remember this is the distance to the mirror and back. Therefore the real distance is 7.2*10^4 / 2 = 3.6*10^4 !!

thanks alot :d

Reply 597

Brave reader

Original post by 13142vp

guys looking at unit 1, I predict that some sort of scale diagrams/drawings will come up in unit 2 too
and some big questions on electricity/ultrasound

Yes sir my predictions and yours are similar. I predicted alot of electricity and the diagrams like emf, filament diagram. Ultrasound -pulses and spectra line so energy levels will come up hope we are right.

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Reply 598

Ripper Phoenix

already preparing my petition for tomorrow's physics paper...... :colone:

Reply 599

Kaneda

Original post by Paras Agarwal

jan 14 question 10 guys? please?

the answer is b because when you use the potential divider formula and you try to find the terminal voltage which is basically the voltage of the circuit and when you use the voltage of the circuit youll want to use the the resistance outside the battery so you rearrange to give the expression B
hope you understood it.. if not
https://www.youtube.com/watch?v=MImq6R6QCgg

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Edexcel Unit 2: Physics at Work ~9th June 2014

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