Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 225541 times)

Offline Syed Kazim

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2235 on: May 26, 2010, 10:02:49 pm »
like increasing the length of the wire increases resistance so what does increasin thickness of wire do?

An increase in the length of a wire will decrease increase the resistance.
An increase in the diameter of a wire will decrease the resistance.
« Last Edit: May 26, 2010, 10:13:17 pm by Syed Kazim »
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2236 on: May 26, 2010, 10:03:24 pm »
http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdf
Can u plzz help, m totally stuck at this question and need to understand it fully cuz if i dont then m *** up tommorow :S

10)c)d)e)
first at C) how can we get Energy when we dont have time?
Then i get confused by the repeating stuff in the other questions

plz explain in a simple way cuz  m confused :S

Thankssss :)

For c use this formula p=I^2 * r

d) The simple voltage formula that is V= IR
You jst hav to calculate the voltage drop by the resistor

e) There r 2 resistor so for one resistor the voltage drop is 7.5...Multiply by it 2 and subtract from the 22000
« Last Edit: May 26, 2010, 10:06:10 pm by ang3l »
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Offline Baladya

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2237 on: May 26, 2010, 10:05:00 pm »
http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdf
Can u plzz help, m totally stuck at this question and need to understand it fully cuz if i dont then m *** up tommorow :S

10)c)d)e)
first at C) how can we get Energy when we dont have time?
Then i get confused by the repeating stuff in the other questions

plz explain in a simple way cuz  m confused :S

Thankssss :)

cmon plzzz help   ::)
Looks like i ran out of cool signatures :|

Offline Baladya

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2238 on: May 26, 2010, 10:06:02 pm »
For c use this formula p=I^2 * r

ya okay, but thats for power, but they said energy??
Looks like i ran out of cool signatures :|

Offline blackberry

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2239 on: May 26, 2010, 10:06:36 pm »
thanks syed, baladya and diva!!!!!!!!

i kan sleep in peace noww!!!
You gotzz to cheel!!!! tuh-may-toez and un-yunz!!!
:)

Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2240 on: May 26, 2010, 10:07:20 pm »
http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Nov/0625_w09_qp_31.pdf
Can u plzz help, m totally stuck at this question and need to understand it fully cuz if i dont then m *** up tommorow :S

10)c)d)e)
first at C) how can we get Energy when we dont have time?
Then i get confused by the repeating stuff in the other questions

plz explain in a simple way cuz  m confused :S

Thankssss :)

u got afternoon right ?? thn i;ll do this tmw (for me). . im off to sleep ;)
like ang3l said use

H= I^2R

H is loss of heat energy ;)

Offline diva_sparkles

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2241 on: May 26, 2010, 10:08:01 pm »
cmon plzzz help   ::)
rate of loss of energy is the definition of power so thts how u do it!!!
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Offline Helium

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2242 on: May 26, 2010, 10:08:32 pm »
hey can anyone explain me question 9(C) (2) ? ??? 0625/31/M/J/08

You can use fleming left hand rule to find the movement of the flexible wire.

-Point first finger in  the direction of the magnetic field (from n to s)
-rotate your hand about that your finger until your second finger points in the direction of the Current.

then your thumb points in the direction of the movement of wire
Aiming for the top

Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2243 on: May 26, 2010, 10:08:39 pm »
ya okay, but thats for power, but they said energy??

Energy loss = I^2 R
thats how it is in my text book :P
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Offline Baladya

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2244 on: May 26, 2010, 10:09:23 pm »
u got afternoon right ?? thn i;ll do this tmw (for me). . im off to sleep ;)
like ang3l said use

H= I^2R

H is loss of heat energy ;)


k thx all :P Vin plz stay alive for tommorow :D xD jk :P but plz help tommorow :P
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Offline Syed Kazim

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2245 on: May 26, 2010, 10:09:41 pm »
ya okay, but thats for power, but they said energy??

Yes, same thing.
--Les intellectuels de résoudre les problèmes, les génies les préviennent.

Offline diva_sparkles

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2246 on: May 26, 2010, 10:10:08 pm »
An increase in the length of a wire will decrease the resistance.
An increase in the diameter of a wire will also decrease the resistance.
sory 2 say but an increase in length increases resistance
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Offline Syed Kazim

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2247 on: May 26, 2010, 10:10:25 pm »
thanks syed, baladya and diva!!!!!!!!

i kan sleep in peace noww!!!

You're welcome. :)
--Les intellectuels de résoudre les problèmes, les génies les préviennent.

Offline NightHawkerr

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2248 on: May 26, 2010, 10:10:46 pm »
Can somebody tell me what to study for the CRO for tomorrow's exam? I mean I know how to label and stuff, but then they get too complicated! HELP! ???

Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2249 on: May 26, 2010, 10:11:40 pm »
sory 2 say but an increase in length increases resistance
correct :D
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