Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 225472 times)

Offline winnie101

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #165 on: May 06, 2010, 09:58:37 pm »
could someone plz explain to me ques. 5,7,15,18,20,and 29 form m/j 2009 paper 1 physics cie AS level
Thanks

Offline Snake

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #166 on: May 07, 2010, 12:00:26 am »
could someone plz explain to me ques. 5,7,15,18,20,and 29 form m/j 2009 paper 1 physics cie AS level
Thanks

Wrong place to post I think. Post your question again here https://studentforums.biz/index.php/board,82.0.html
-Once the game is over,the king and the pawn go back in the same box-

Offline Snake

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #167 on: May 07, 2010, 12:02:02 am »
That is correct.

So why do they use 0.5AT^2? maybe he confused it with 0.5MV^2 (For Kinetic Energy)?
Woo Now I'm confused :S
-Once the game is over,the king and the pawn go back in the same box-

nid404

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #168 on: May 07, 2010, 06:34:20 am »
So why do they use 0.5AT^2? maybe he confused it with 0.5MV^2 (For Kinetic Energy)?
Woo Now I'm confused :S


huh?

distance is given by ut+1/2at2

k.e= 1/2 mv2

nid404

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #169 on: May 07, 2010, 09:02:31 am »
Can any1 plz explain the thermal expansion? And What expands more.. solids, liquids or gases and why? Thanks in advance

Thermal expansion is a lot in itself.

http://www.docbrown.info/page03/3_52states.htm   excellent stuff.

Offline Hesham Mhd

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #170 on: May 07, 2010, 09:14:52 am »
srry but, i did find nthn about the expansions O_o, can yu just expain it on here in brief plz?

nid404

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #171 on: May 07, 2010, 09:17:36 am »
ohk...you wanted to know how they expand relatively right.

solids<liquids<gases

What else do you want to know..?

if you put pointers from the syllabus, it'll be easier for me

Offline Hesham Mhd

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #172 on: May 07, 2010, 09:22:57 am »
um ok, 'Describe Qualitatively the thermal expansion in solids, liquids and gases' ?

nid404

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #173 on: May 07, 2010, 09:25:19 am »
Please go through the link I provided. It explains thermal expansion well...

holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #174 on: May 07, 2010, 09:27:21 am »
um ok, 'Describe Qualitatively the thermal expansion in solids, liquids and gases' ?

In short:

solids have strong electrostatic bonds between particles that prevent them from expanding too much.

liquids have slightly weaker bonds and can expand a bit more

gases have NO forces of attraction and can expand to fill up container and exert GREATER pressure when heated.

Offline Hesham Mhd

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #175 on: May 07, 2010, 10:29:02 am »
Thanks alot dude, and, can yu explain the thermal expansion in terms of molecules?

holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #176 on: May 07, 2010, 10:32:02 am »
Thanks alot dude, and, can yu explain the thermal expansion in terms of molecules?

As the temperature rises the kinetic energy of the molecules increases as they begin to vibrate faster. Some of this energy is used to increase the spacing between individual molecules leading to expansion of material.

Offline Hesham Mhd

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #177 on: May 07, 2010, 10:44:05 am »
Thanks alot!, yu really cleared this 4 me. :D
And, if we have a converging lens, when will it form a magnified, virtual image? and when will it form a real, upside-down image?

holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #178 on: May 07, 2010, 11:19:11 am »
magnified, virtual = object is closer to the lens than the focal length.

real, upside down = every other position except the one above.

Offline Hesham Mhd

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #179 on: May 07, 2010, 11:45:53 am »
Really Thanks, yu've got some reputation added :D