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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 228599 times)

Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #885 on: May 21, 2010, 05:47:08 pm »
wat u guys talking about ??

THERE IS NO PROB WITH THE MS

http://www.furryelephant.com/player.php?subject=physics&jumpTo=re/9D2s5
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Offline Fastal

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #886 on: May 21, 2010, 05:49:51 pm »
Quote from: A@di on May 21, 2010, 04:21:30 pm
"see the question in a different way/manner.... u see  16.3 is not lost by the heater only... they gave u a hint tht excess heat (not from the heater ) was also applied to the ice..

what u need to do, is to take out tht excess heat (by subtracting) and u get the actuall heat supplied by the heater (which is needed for the equation)"



yeah but it says
"16.3g of ice was melted in 2 minutes USING THE HEATER."
and "FURTHER 2.1g was melted"

cie messed up
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Offline J.Darren

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #887 on: May 21, 2010, 05:50:25 pm »
Quote from: ~VIN1094~ on May 21, 2010, 05:47:08 pm
wat u guys talking about ??

THERE IS NO PROB WITH THE MS

http://www.furryelephant.com/player.php?subject=physics&jumpTo=re/9D2s5
I misread the question, that's all.
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Offline J.Darren

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #888 on: May 21, 2010, 05:52:28 pm »
Quote from: Fastal on May 21, 2010, 05:49:51 pm
yeah but it says
"16.3g of ice was melted in 2 minutes USING THE HEATER."
and "FURTHER 2.1g was melted"

cie messed up
Reply #875 :D
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #889 on: May 21, 2010, 05:53:50 pm »
Quote from: J.Darren on May 21, 2010, 05:50:25 pm
I misread the question, that's all.

Oh im sorry, i didnt see ur reply  ;)
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Offline ambitious94

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #890 on: May 21, 2010, 05:54:24 pm »
Quote from: J.Darren on May 21, 2010, 04:28:34 pm
heat is gained from the surroundings in the experiment, by measuring for another two minutes, you can work out the effect of heat gained from the surroundings (ice that were melted due to those heat), subtract that from the total amount of ice melted will get you the full amount of ice melted due to the energy supplied by the heater.
But isn't it somewhat illogical. I mean isn't some of the heat from the heater still not present in the ice? It could be acting too. :S Anyways, thanks for all the help, all of u, it's helped me a lot!  ;D
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Offline ambitious94

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #891 on: May 21, 2010, 05:55:12 pm »
Quote from: Fastal on May 21, 2010, 05:49:51 pm
yeah but it says
"16.3g of ice was melted in 2 minutes USING THE HEATER."
and "FURTHER 2.1g was melted"

cie messed up
i totally agree with u :) XD
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #892 on: May 21, 2010, 05:55:26 pm »
Quote from: J.Darren on May 21, 2010, 05:50:25 pm
I misread the question, that's all.
well then my mistake

can u explain why into out of paper????

With L.H. rule the connvectional current goes upwards..so electron should go downwards shouldnt it??

FIELD IS DOWN FIRST FINGER ( POINTING TOWRDS ME )
SECOND  ( TO THE RIGHT )
THUMB IS UP
whats wrong?
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Offline Fastal

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #893 on: May 21, 2010, 05:57:17 pm »
Quote from: J.Darren on May 21, 2010, 04:28:34 pm
heat is gained from the surroundings in the experiment, by measuring for another two minutes, you can work out the effect of heat gained from the surroundings (ice that were melted due to those heat), subtract that from the total amount of ice melted will get you the full amount of ice melted due to the energy supplied by the heater.

Specific latent heat of fusion = ML

40 x 120 = (16.3 - 2.1) L

L = 338 J / g

n = sin i / sin r (from rarer to denser medium. if it is from denser to rarer medium, such as glass to air, then take the reciprocal, sin r / sin i)

OHICOMPLETELYUNDERSTAD,

THANKYOU
+rep
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Offline Fastal

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #894 on: May 21, 2010, 05:58:14 pm »
Quote from: ambitious94 on May 21, 2010, 05:55:12 pm
i totally agree with u :) XD

read post#875

cie didnt mess up lol
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #895 on: May 21, 2010, 05:59:12 pm »
and "FURTHER 2.1g was melted" is stated only because to confuse people .. but the actual thing is 16.3g of ice was melted in 2 minutes USING THE HEATER and 2.1g is to indicate that ONLY 14.2g was melted .. do not confuse yourself with such stuff .. CIE has to ask something something which is tricky .. you cannot expect them to ask direct question ..
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #896 on: May 21, 2010, 06:00:44 pm »
Quote from: ~VIN1094~ on May 21, 2010, 04:21:03 pm
Q = mL

power is nothing but Joules per second

heat (Q) = 40 J/sec * 120 sec

Q = 4800 J
mass = 16.3-2.1 = 14.2
as the mass melted by the heater is only till 2.1g

4800 = 14.2 * L
L= 338 J/g

lemme check the other ques

ALWAYS formula for refractive index depends from which medium it passes
eg .
From denser to rarer (glass to air) = sin r /sin i
From rarer to denser (air to glass =  sin i / sin r

here its(glass to air) = sin r /sin i

sin r/sin 30 = 1.49
sin r = sin (30) * 1.49
r = sin-1(0.745)
=48.2 o


i believe i explained it even before  ::) ::) jk doesnt matter who explained before .. glad u got it ;)
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Offline Fastal

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #897 on: May 21, 2010, 06:02:31 pm »
Quote from: ~VIN1094~ on May 21, 2010, 06:00:44 pm
i believe i explained it even before  ::) ::) jk doesnt matter who explained before .. glad u got it ;)

yeah but what Darren said maid more sense(sorry)
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #898 on: May 21, 2010, 06:04:42 pm »
Quote from: ~VIN1094~ on May 21, 2010, 06:00:44 pm
i believe i explained it even before  ::) ::) jk doesnt matter who explained before .. glad u got it ;)
well then my mistake

can u explain why into out of paper?Huh?

With L.H. rule the connvectional current goes upwards..so electron should go downwards shouldnt it??

FIELD IS DOWN FIRST FINGER ( POINTING TOWRDS ME )
SECOND  ( TO THE RIGHT )
THUMB IS UP
whats wrong?

for the october question please explain !
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Offline The Golden Girl =D

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #899 on: May 21, 2010, 06:06:07 pm »
poeple how should i study for paper 3 physics

i believe i should mainly concentrate on memorizing the notes very well ,and i think that past papers r  not a necessity as practsing for paper 6 , u kno what i mean


so what do u suggest? ....answer ASAP plz
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