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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 230341 times)

Amr Fouad

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #60 on: April 21, 2010, 10:22:53 am »
Quote from: Ari Ben Canaan on April 21, 2010, 10:21:59 am
Even I said that !!!!!

My answer booklet (not the real Markscheme) says it will become BRIGHTER THAN NORMAL..... -_-


Stupid answer booklet... >:(

LOL
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nid404

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #61 on: April 21, 2010, 10:25:13 am »
Yes true that
Brightness is a measure of power...At constant voltage, P=I2 R. Increase in resistance due to the addition of the 3rd lamp, cause a fall in the current
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Offline The Golden Girl =D

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #62 on: April 22, 2010, 12:43:51 pm »
Quote from: Ari Ben Canaan on April 21, 2010, 10:21:59 am
Even I said that !!!!!

My answer booklet (not the real Markscheme) says it will become BRIGHTER THAN NORMAL..... -_-


Stupid answer booklet... >:(

wait a sec, y does it increase? ...now i am confused?!!? ..can someone plz explain o.0
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nid404

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #63 on: April 22, 2010, 12:45:22 pm »
Quote from: the golden girl on April 22, 2010, 12:43:51 pm
wait a sec, y does it increase? ...now i am confused?!!? ..can someone plz explain o.0

it doesn't increase

we're explaining why it would decrease...
check our posts above...ull understand why
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Offline The Golden Girl =D

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #64 on: April 22, 2010, 12:47:09 pm »
Quote from: nid404 on April 22, 2010, 12:45:22 pm
it doesn't increase

we're explaining why it would decrease...
check our posts above...ull understand why

thx alot   :-[
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Verily, in the remembrance of Allah do hearts find rest(13:28)

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nid404

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #65 on: April 22, 2010, 12:48:54 pm »
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Offline saleemsamer

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #66 on: April 23, 2010, 11:17:55 am »
i have a doubt can some1 explain to me the mechanical methods of measurement of small distances it was in the 1st question of O/N 2009 i need both ways plz.
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Offline astarmathsandphysics

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #67 on: April 23, 2010, 03:58:09 pm »
You mean vernier scales
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #68 on: April 23, 2010, 04:01:04 pm »
Quote from: saleemsamer on April 23, 2010, 11:17:55 am
i have a doubt can some1 explain to me the mechanical methods of measurement of small distances it was in the 1st question of O/N 2009 i need both ways plz.

Search on youtube how to read vernier callipers. Excellent.
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Offline saleemsamer

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #69 on: April 23, 2010, 04:18:05 pm »
VERY NICE youtube has some nice vids and i would like to share them
http://www.youtube.com/watch?v=CdNkxw4-u-Q ( Micrometer)
http://www.youtube.com/watch?v=Vz40xmrdhyY  (Vernier Caliper )
« Last Edit: April 23, 2010, 04:28:37 pm by saleemsamer »
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Offline saleemsamer

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #70 on: April 23, 2010, 04:32:30 pm »
 ;D :DTHX GUYS
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Offline CatAly$t

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #71 on: April 26, 2010, 07:12:35 pm »
can someone tell me what is an optic pin??
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Offline Cool guy

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #72 on: April 26, 2010, 07:24:14 pm »
hey guys can u explain me carbon dating????
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Offline astarmathsandphysics

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #73 on: April 26, 2010, 10:20:39 pm »
carbon dating.
radioactive carbon 14 is constant ly produced in the atmosphere by caosmic rays.Plants use it to grown and animals eat the plants. a steady concentration is maintained. When the living thing dies they stop earing the plants and the carbon 14 concentration starts to fall since the carbon decays at a constant rate and is not repkaced.By measuring the concentration of carbon 14 we can say how long since the animal died.
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #74 on: April 29, 2010, 12:18:22 pm »
2002 Nov Paper 3 Question 8:

Fig. 8.1 shows a long straight wire between the poles of a permanent magnet.
It is connected through a switch to a battery so that, when the switch is closed, there is a
steady current in the wire.

(wire in a direction at right angles to the page)

How can we find the direction of the movement of wire..I know by using fleming's L.H.R but there is no direction for current given?Or maybe i didnt understood the question :S
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