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Author Topic: CIE PHYSICS P4 QUESTIONS  (Read 2733 times)

Offline lilian floyd

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Re: CIE PHYSICS P4 QUESTIONS
« Reply #15 on: May 26, 2010, 11:01:12 am »
is anyone of you kind enuf to answer this question?

physics paper 4 nov 2005 Q:6 c (ii)

please and thank you..
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Offline Onion

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Re: CIE PHYSICS P4 QUESTIONS
« Reply #16 on: May 26, 2010, 12:11:05 pm »
Quote from: lilian floyd on May 26, 2010, 11:01:12 am
is anyone of you kind enuf to answer this question?

physics paper 4 nov 2005 Q:6 c (ii)

please and thank you..
when t is between 0 and T: E is zero (i.e. horizontal line on the t-axis)
now for the second and third section - again is a horizontal line but it does not matter which way you put them as long as they are in opposite (i.e. 2nd might be below the t-axis and 3rd above the t-axis or vice versa)

but the third part needs to be double of the second part ...

I hope that makes sense  :D
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Offline lilian floyd

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Re: CIE PHYSICS P4 QUESTIONS
« Reply #17 on: May 26, 2010, 12:32:23 pm »
thanks onion..(why onion?)
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Offline Onion

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Re: CIE PHYSICS P4 QUESTIONS
« Reply #18 on: May 26, 2010, 12:41:36 pm »
Quote from: lilian floyd on May 26, 2010, 12:32:23 pm
thanks onion..(why onion?)
Its a name I used when I play COD 4  ;D and I love Onion Tou  :D
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Offline s16

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Re: CIE PHYSICS P4 QUESTIONS
« Reply #19 on: May 26, 2010, 04:41:21 pm »
In jun 04 d.ii) why is it 3 ?!
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Offline AndrewCedric

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Re: CIE PHYSICS P4 QUESTIONS
« Reply #20 on: May 26, 2010, 05:04:39 pm »
Quote from: s16 on May 26, 2010, 04:41:21 pm
In jun 04 d.ii) why is it 3 ?!

It is not a sine wave. Square waves have the RMS equal to peak voltage. You have to accept this at A level.
For sawtooth voltage , for example, its RMS=Vo/( square root of 3). And so on.
You can check it out at wikipedia if you want to know the detail explanation
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Offline s16

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Re: CIE PHYSICS P4 QUESTIONS
« Reply #21 on: May 26, 2010, 06:48:54 pm »
Ok thank you I never knew about this.
Oh and could anybody please explain eddy currents to me ? I don't really get them where do they come from what do they do ... ??
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Offline Onion

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Re: CIE PHYSICS P4 QUESTIONS
« Reply #22 on: May 27, 2010, 06:11:29 am »
Quote from: s16 on May 26, 2010, 04:41:21 pm
In jun 04 d.ii) why is it 3 ?!
Actually there is another way to think of it. First what is the rms value - its the Root Mean Square value

that means you Square all the values first (when you square - you'll get the value of 9 [both the -ve and +ve part])
then you take the Mean (mean of 9 is just 9  :D)
and last you take the Root (square root of 9 is 3 !!  ;))
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A-levels (CIE) '10
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UCAS '10 Mechanical Engineering
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Offline s16

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Re: CIE PHYSICS P4 QUESTIONS
« Reply #23 on: May 27, 2010, 04:16:49 pm »
What about june2009 q11.b)iii) .. I don't understand what they did :s
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Offline s16

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Re: CIE PHYSICS P4 QUESTIONS
« Reply #24 on: May 27, 2010, 04:21:22 pm »
And q6 June 2009 also part c) please .. To do with rms .. Which I'm really confused about !
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Offline sizbeauty

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Re: CIE PHYSICS P4 QUESTIONS
« Reply #25 on: May 27, 2010, 08:29:06 pm »
plz sm1 ans ma queries ??? ???

nov09/42
Q1 part (c)
Q3 part (c)
Q5 part a2
Q7 part b2
Q9 part c2
Q10 part a2
Q11 part c2

nov09/41
q5 part b2
Q6 part b1
Q10
Q12 part d

atleast sm1 ans sm of these ques if he cant all....plz i really need help in thm
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