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Author Topic: Edexcel PHYSICS Doubts  (Read 135985 times)

Offline The Golden Girl =D

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Re: Edexcel PHYSICS Doubts
« Reply #555 on: May 17, 2011, 12:08:29 pm »
Quote from: mustafa09 on May 17, 2011, 10:20:16 am
Do we have to know how to calculate internal resistance in the unit 3B, if yes can someone tell me how

you just have to know the formulas cuz they might ask you to change it into the form y = mx +c

but the formuls for Internal resistance it    e = IR +Ir

e => emf
I => current
R=> load /external resistance
r => internal resistance

that's it.
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Offline The Golden Girl =D

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Re: Edexcel PHYSICS Doubts
« Reply #556 on: May 17, 2011, 12:26:41 pm »
Quote from: MasterMath on May 17, 2011, 11:48:26 am
2009 June 7 a) I get the question but in the MS they said "comment on liquid level" what do they mean :O ?

is for you to comment on how you would find the distance of the liquid from the ground.

what I wrote ; find the liquid level from the top of the bench and subtract readings obtained "SA" and "SB"


I hope I helped.
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Offline sean321

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Re: Edexcel PHYSICS Doubts
« Reply #557 on: May 17, 2011, 07:24:55 pm »
does any1 have a set of MCQ from past papers? for physics paper 3?
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Offline KJ1995

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Re: Edexcel PHYSICS Doubts
« Reply #558 on: May 17, 2011, 09:32:10 pm »
Does anyone know how to choose the best setting for a multimeter?? I saw a question in 2010 paper 3b and one in 2011 jan paper 3b...unfortunately i didnt know how to solve them both, they were the first question in multiple choice
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Offline Malak

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Re: Edexcel PHYSICS Doubts
« Reply #559 on: May 17, 2011, 10:26:55 pm »
Quote from: KJ1995 on May 17, 2011, 09:32:10 pm
Does anyone know how to choose the best setting for a multimeter?? I saw a question in 2010 paper 3b and one in 2011 jan paper 3b...unfortunately i didnt know how to solve them both, they were the first question in multiple choice
I had the same question..its on the last page..

But anywayz
Quote
May '10 Q.1

first of all find total resistance = 100 + 10 = 110 ohms

then calculate the current using formula I = V/R = 3v / 110 ohms = 0.0272

multiply it by 1000 , you'll get 200 mA  hence answer is C

Jan '11 Q.1

same as above .. total resistance = 110 ohms  , V = 3 , I = 3/110 = 0.0273 A   

then find V across R {100 ohms } ....V = 0.027 * 100 = 2.7v

hence the one that BEST fits is B that is the 20v

Thx to Golden Girl
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Offline KJ1995

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Re: Edexcel PHYSICS Doubts
« Reply #560 on: May 18, 2011, 09:30:16 am »
guys can u plz tell me how to find the uncertainty between 2 values and 3 values
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Offline Malak

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Re: Edexcel PHYSICS Doubts
« Reply #561 on: May 18, 2011, 10:25:21 am »
Quote from: KJ1995 on May 18, 2011, 09:30:16 am
guys can u plz tell me how to find the uncertainty between 2 values and 3 values

Check pm
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Offline KJ1995

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Re: Edexcel PHYSICS Doubts
« Reply #562 on: May 18, 2011, 10:35:15 am »
Quote from: ang3l on May 18, 2011, 10:25:21 am
Check pm

Thanks man uve helped me alot :D its (max-min)/2...right?
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Offline Malak

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Re: Edexcel PHYSICS Doubts
« Reply #563 on: May 18, 2011, 10:40:40 am »
Quote from: KJ1995 on May 18, 2011, 10:35:15 am
Thanks man uve helped me alot :D its (max-min)/2...right?
I think u can do it that way too..It works

But i do it the other way as my teacher told me..

For eg if u have these values 0.20, 0.18, 0.19

I would do it like:

Find the avg. which i get as 0.19

and then the greatest difference is 0.20 - 0.19 = 0.01
So i get my uncertainty that is +/- 0.01

But u can do it that way too i guess...Jst do the way u find it easy.. :D
And Good Luck Everyone  :D
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Offline NightHawkerr

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Re: Edexcel PHYSICS Doubts
« Reply #564 on: May 20, 2011, 03:48:50 pm »
Guys how was your physics unit 3B? How did you plan out your experiment?
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Offline The Golden Girl =D

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Re: Edexcel PHYSICS Doubts
« Reply #565 on: May 20, 2011, 03:51:12 pm »
It was good except for the last Question.

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Offline Malak

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Re: Edexcel PHYSICS Doubts
« Reply #566 on: May 20, 2011, 04:08:21 pm »
Quote from: ~ The Golden Girl ~ on May 20, 2011, 03:51:12 pm
It was good except for the last Question.


lol..same here everything was good except the last one..The uncertainty and angle thing was weird huh
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Offline The Golden Girl =D

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Re: Edexcel PHYSICS Doubts
« Reply #567 on: May 21, 2011, 09:14:58 am »
Indeed they were =.=
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Offline MasterMath

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Re: Edexcel PHYSICS Doubts
« Reply #568 on: May 21, 2011, 10:00:26 am »
Uncertainty and a bit of the thermistor were -______-"
The apparatus not in the diagram.. I had everything on my diagram :S
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Offline NightHawkerr

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Re: Edexcel PHYSICS Doubts
« Reply #569 on: May 21, 2011, 02:32:23 pm »
Yeah i did not know how to find the uncertainty, and my refractive index was weird ><
Lol what apparatus did you use for the thermistor question..?
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