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Author Topic: Physics AS practical 3rd Nov  (Read 10701 times)

Offline MaNi_DaDuDe

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Physics AS practical 3rd Nov
« on: October 30, 2009, 06:33:13 pm »
Any ideas peeps?

Any help would be appreciates. :)
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Offline pravin_5

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Re: Physics AS practical 3rd Nov
« Reply #1 on: October 31, 2009, 01:36:43 am »
hang on mani.....i'll try to find smth!! are u doing paper 33??? mine is paper 33 on 3rd nov.... ;D
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Offline heemvi

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Re: Physics AS practical 3rd Nov
« Reply #2 on: October 31, 2009, 04:08:31 am »
am doing ppr 32...on tuesD
cn u plzzz hlp me!!
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Offline MaNi_DaDuDe

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Re: Physics AS practical 3rd Nov
« Reply #3 on: October 31, 2009, 01:59:42 pm »
Quote from: pravin_5 on October 31, 2009, 01:36:43 am
hang on mani.....i'll try to find smth!! are u doing paper 33??? mine is paper 33 on 3rd nov.... ;D

Hey Pravin. :)

Yes I am doing paper 33 and on the 3rd of November.

Any help of any sort would be awesome.
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Offline pravin_5

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Re: Physics AS practical 3rd Nov
« Reply #4 on: November 01, 2009, 02:51:02 pm »
Quote from: heemvi on October 31, 2009, 04:08:31 am
am doing ppr 32...on tuesD
cn u plzzz hlp me!!

soooo sorry heemvi,,, bt all d students in my school are doing paper 33 for oct/nov 09...
sorry......bt knw what instead of looking for predictions...i strongly encourage you to revise ur past papers...learn hw to tabulate data accurately....well u mite know that raw data depends on dp of the measurement while processed data depends on sf of the raw data.....for clarification look at marking scheme...then uncertainty in measurements, hw to justify the given statement( explain whether x is proportional to y), drawing graph and ect....and and sources of error and method of improvement for both electrical or mechanical type of questions.....(1 popular answer is that two readings are not enough to draw a valid conclusion.....to improve....repeat the experiment several times to obtain 6 sets of reading and plot a graph)
all the best wishes from me
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Offline raunaqbhatia

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Re: Physics AS practical 3rd Nov
« Reply #5 on: November 01, 2009, 02:55:27 pm »
 :)
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Offline MaNi_DaDuDe

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Re: Physics AS practical 3rd Nov
« Reply #6 on: November 01, 2009, 06:25:35 pm »
Quote from: pravin_5 on November 01, 2009, 02:51:02 pm
soooo sorry heemvi,,, bt all d students in my school are doing paper 33 for oct/nov 09...
sorry......bt knw what instead of looking for predictions...i strongly encourage you to revise ur past papers...learn hw to tabulate data accurately....well u mite know that raw data depends on dp of the measurement while processed data depends on sf of the raw data.....for clarification look at marking scheme...then uncertainty in measurements, hw to justify the given statement( explain whether x is proportional to y), drawing graph and ect....and and sources of error and method of improvement for both electrical or mechanical type of questions.....(1 popular answer is that two readings are not enough to draw a valid conclusion.....to improve....repeat the experiment several times to obtain 6 sets of reading and plot a graph)
all the best wishes from me

Thanks!

+rep'd :)
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Offline falafail

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Re: Physics AS practical 3rd Nov
« Reply #7 on: November 01, 2009, 07:57:55 pm »
Quote from: pravin_5 on November 01, 2009, 02:51:02 pm
well u mite know that raw data depends on dp of the measurement while processed data depends on sf of the raw data.....

could someone explain this please? :/
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Offline lalib10

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Re: Physics AS practical 3rd Nov
« Reply #8 on: November 01, 2009, 08:19:09 pm »
Can sum1 plx explain me how to do the question of may/june 2007 P32
Question number   1d

Taking the values of
I=43.4x10^-3
R3=47
y-intercept as = 7

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Offline falafail

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Re: Physics AS practical 3rd Nov
« Reply #9 on: November 01, 2009, 08:29:22 pm »
Quote from: lalib10 on November 01, 2009, 08:19:09 pm
Can sum1 plx explain me how to do the question of may/june 2007 P32
Question number   1d

Taking the values of
I=43.4x10^-3
R3=47
y-intercept as = 7


okay, you know that the equation of a straight line is y=mx+c right?

in this case, 1/I is y, R3 is x, (R1+R2/ER2) is m (the gradient) and R1/E is c (the y-intercept)
geddit?

just, next time you have a questino like this (which we will, almost definitely), write y=mx+c above the equation given and see which values match with which.

in this question, substitute the values you got for the gradient and the y-intercept to find R1 and R2.
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Offline astarmathsandphysics

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Re: Physics AS practical 3rd Nov
« Reply #10 on: November 01, 2009, 08:35:36 pm »
Quote from: lalib10 on November 01, 2009, 08:19:09 pm
Can sum1 plx explain me how to do the question of may/june 2007 P32
Question number   1d

Taking the values of
I=43.4x10^-3
R3=47
y-intercept as = 7



You measured the emf of the power supply at the start of this question. Suppose it is 240V

y intercept is R1/E=7 so R1/240=7 so R1=240*7=1680

You find the gradient from the graph. Suppose you found it was 2

\frac {R_1 + R_2}{ER_2}=2

\frac {1680 + R_2}{240*R_2}=2

{1680+ R_2}=480*R_2
1680=479R_2
R_2 =1680/479 OHMS


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Offline lalib10

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Re: Physics AS practical 3rd Nov
« Reply #11 on: November 01, 2009, 09:32:13 pm »
shukraaaaaaaaannnnnnnnn


astarmathsandphysics and falafail
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Offline lalib10

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Re: Physics AS practical 3rd Nov
« Reply #12 on: November 01, 2009, 09:38:23 pm »
Can you also tell me a few basic Uncertainties to remeber....
like for diameter of wire it is 0.01

can you tell me a site or give me a list of most of the uncertainties....


thnxx
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Offline astarmathsandphysics

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Re: Physics AS practical 3rd Nov
« Reply #13 on: November 01, 2009, 10:58:57 pm »
I will try and make a page for my website but wont be able to do it until tomorrow.
In general the unvertainy is equal to the smallest interval on the scale.
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Offline MaNi_DaDuDe

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Re: Physics AS practical 3rd Nov
« Reply #14 on: November 02, 2009, 05:03:07 am »
Quote from: astarmathsandphysics on November 01, 2009, 10:58:57 pm
I will try and make a page for my website but wont be able to do it until tomorrow.
In general the unvertainy is equal to the smallest interval on the scale.

Exam's tomorrow.
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