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Author Topic: Physics Help HERE ONLY !!  (Read 81778 times)

Offline sweetie

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Re: Physics Help HERE ONLY !!
« Reply #630 on: June 03, 2009, 07:26:08 pm »
Quote from: notty_me on June 03, 2009, 07:19:51 pm
wat is da constant in
       
resistance= constant x length/ cross- sectional area

plzzzzz reply quick
thanx
plzzzzzzz i need an answer
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Offline care

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Re: Physics Help HERE ONLY !!
« Reply #631 on: June 03, 2009, 07:27:10 pm »
the constant depends on the material that the resistance wire is made of!
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Offline MaNa

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Re: Physics Help HERE ONLY !!
« Reply #632 on: June 03, 2009, 07:27:44 pm »
Quote from: notty_me on June 03, 2009, 07:26:08 pm
Quote from: notty_me on June 03, 2009, 07:19:51 pm
wat is da constant in
       
resistance= constant x length/ cross- sectional area

plzzzzz reply quick
thanx
plzzzzzzz i need an answer
constant is the density
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Offline sweetie

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Re: Physics Help HERE ONLY !!
« Reply #633 on: June 03, 2009, 07:27:51 pm »
doesnt have a value????????
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Offline MaNa

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Re: Physics Help HERE ONLY !!
« Reply #634 on: June 03, 2009, 07:28:58 pm »
Quote from: notty_me on June 03, 2009, 07:27:51 pm
doesnt have a value????????
it sure does its always given in the question
cuz its the density ofthe wire which they dont expect u to know
i dont think they have ever bring such eq.
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Offline Ghost Of Highbury

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Re: Physics Help HERE ONLY !!
« Reply #635 on: June 03, 2009, 07:29:59 pm »
the constant is different for different materials
it is called the resistivity for the material
R = k*l / a
the resistivities of metals increase at high. temperatures, for most other materials
it decreases
 :)

don't worry u don't need to know the value
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Offline AS girl

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Re: Physics Help HERE ONLY !!
« Reply #636 on: June 03, 2009, 07:30:29 pm »
Quote from: Eamyzz on June 03, 2009, 07:25:14 pm
manah and Ig grl i love ur pictures...they r so WOOOOOW  :o  ;)

Thanks..i like ur pic 2-it's from legally blonde 1 right? I watched this movie like 5 times and never got bored from it!
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Offline MaNa

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Re: Physics Help HERE ONLY !!
« Reply #637 on: June 03, 2009, 07:30:59 pm »
Quote from: care on June 03, 2009, 07:26:02 pm
can someone explain me the difference between virtual and real image?
real image is foremed when all the ray frm a pont on an object are brought togeth again to another point
the real image can be seen in the screen
virtual image is formed where the virtual rays appear to come from when a screen is placed no image are formed
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Offline care

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Re: Physics Help HERE ONLY !!
« Reply #638 on: June 03, 2009, 07:31:27 pm »
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Offline Ghost Of Highbury

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Re: Physics Help HERE ONLY !!
« Reply #639 on: June 03, 2009, 07:32:14 pm »
Quote from: care on June 03, 2009, 07:26:02 pm
can someone explain me the difference between virtual and real image?
a real image is one which can be produced on a screen and is formed by rays that actually pass through it

a virtual image cannot be formed on a screen, rays appear to come from the ray but actually don't.
 :)
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Offline annie_angel

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Re: Physics Help HERE ONLY !!
« Reply #640 on: June 03, 2009, 07:32:58 pm »
Quote from: care on June 03, 2009, 07:26:02 pm
can someone explain me the difference between virtual and real image?
virtual image-->cannot be obtained on screen
real image-->can be obtained on screen

hope this helps:)
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Offline Ghost Of Highbury

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Re: Physics Help HERE ONLY !!
« Reply #641 on: June 03, 2009, 07:33:08 pm »
as i said its resisivity
not density
good luck
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Offline MaNa

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Re: Physics Help HERE ONLY !!
« Reply #642 on: June 03, 2009, 07:33:33 pm »
Quote from: care on June 03, 2009, 07:31:27 pm
http://en.wikipedia.org/wiki/Electrical_resistance#Resistance_of_a_conductor

and it's not the density of the material!

oh yaa ma badd i looked throgh the pymbol which was like density one =? its resistivity :)
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Offline sweetest angel

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Re: Physics Help HERE ONLY !!
« Reply #643 on: June 03, 2009, 07:34:52 pm »
november 1999 Q3 (a)
please anyone?
the markscheme xplains ntin' 'n its so hard ='(
any help is most appreciated

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Offline MaNa

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Re: Physics Help HERE ONLY !!
« Reply #644 on: June 03, 2009, 07:35:17 pm »
GUYS AVERAGE MARKS FOR AN A*
n do u have any prediction abt the topics?
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