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Author Topic: IGCSE PHYSICS  (Read 23591 times)

Offline ~~~~shreyapril~~~~

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Re: IGCSE PHYSICS
« Reply #225 on: November 08, 2009, 02:59:57 pm »
Quote from: ~~~~shreycool~~~~ on November 08, 2009, 02:56:21 pm
direct form ms!!
no editing:
(b) any attempt to use p x v = constant or correct
proportion
fraction 2 x 80/25 seen
p = 6.4 x 10 (Pa)
i guess they have missed 6.4 *105

this is the true ans!!
i guess the ms is wrong again!!!
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Offline @d!_†oX!©

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Re: IGCSE PHYSICS
« Reply #226 on: November 08, 2009, 03:00:34 pm »
hey wassup...the answer is 64 * 10^5 Pa
the ms has misprinted nd forgotten to add 5 there
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Offline wassup

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Re: IGCSE PHYSICS
« Reply #227 on: November 08, 2009, 03:00:52 pm »
ok thanks ppl
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Offline @d!_†oX!©

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Re: IGCSE PHYSICS
« Reply #228 on: November 08, 2009, 03:01:58 pm »
hey wassup check this out, direct from the er:
Question 4
(a) The confusion between particles and molecules was less common than with previous questions on
this topic. However there were considerable numbers of candidates who thought that the dust
particles were “lighter than the heavy air molecules”. Many answers were spoilt by extending this
wrong concept to “fast moving dust particles colliding with air molecules”. However, there were
many excellent answers seen.
(b) Large numbers of fully correct answers were seen, generally well set out and with all the working
shown. The most common error was the use of 2 x 25/80 instead of 2 x 80/25.
Answer: (b) 6.4 x 105 Pa.
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Offline ~~~~shreyapril~~~~

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Re: IGCSE PHYSICS
« Reply #229 on: November 08, 2009, 03:02:30 pm »
thats wat i have told earlir!!!
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Offline wassup

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Re: IGCSE PHYSICS
« Reply #230 on: November 08, 2009, 03:08:17 pm »
Quote from: @d!_†oX!© on November 08, 2009, 03:01:58 pm
hey wassup check this out, direct from the er:
Question 4
(a) The confusion between particles and molecules was less common than with previous questions on
this topic. However there were considerable numbers of candidates who thought that the dust
particles were “lighter than the heavy air molecules”. Many answers were spoilt by extending this
wrong concept to “fast moving dust particles colliding with air molecules”. However, there were
many excellent answers seen.
(b) Large numbers of fully correct answers were seen, generally well set out and with all the working
shown. The most common error was the use of 2 x 25/80 instead of 2 x 80/25.
Answer: (b) 6.4 x 105 Pa.

thanks adi
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Offline @d!_†oX!©

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Re: IGCSE PHYSICS
« Reply #231 on: November 08, 2009, 03:09:19 pm »
anytime wassup!!
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Offline Mari mc

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Re: IGCSE PHYSICS
« Reply #232 on: November 08, 2009, 03:21:42 pm »
do we need to know the formulas for paper 3?
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Offline Ghost Of Highbury

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Re: IGCSE PHYSICS
« Reply #233 on: November 08, 2009, 03:22:27 pm »
of course. its a theory paper. u have to know everything.
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Offline @d!_†oX!©

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Re: IGCSE PHYSICS
« Reply #234 on: November 08, 2009, 03:22:35 pm »
of course u need to!!!!!!!!!!! :o :o
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Offline neelcullen

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Re: IGCSE PHYSICS
« Reply #235 on: November 08, 2009, 03:30:14 pm »
could anyone explain wat's charles law?? :S
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Re: IGCSE PHYSICS
« Reply #236 on: November 08, 2009, 03:39:06 pm »
Quote from: neelcullen on November 08, 2009, 03:30:14 pm
could anyone explain wat's charles law?? :S

charles law is when pressure is constant for an ideal gas the volume is directly proportional to the absolute temperature
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Offline ~~~~shreyapril~~~~

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Re: IGCSE PHYSICS
« Reply #237 on: November 09, 2009, 05:56:49 am »
chrles law is something to do wih pressure and volume and temp!!
u dont take tension just remmeber that:

volume is directly propotional to temp
and presure is inversley to volume!!
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Offline xXFaKeXx

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Re: IGCSE PHYSICS
« Reply #238 on: November 09, 2009, 06:01:16 am »
Charles law states that >> the volume of a fixed mass of gas is directly proportional to its absolute temperature when pressure is kept constant.
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