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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 229535 times)

Offline MasterMath

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1380 on: May 25, 2010, 05:39:25 pm »
Quote from: jellybeans on May 25, 2010, 05:37:47 pm
lol i seee, haha kay then. thaaanks anyways, :) youre taking.. A lvls? O.o
My school is weird .. we do Physics chem bio O'levels at grade 11 , Grade 10 Computer studies math english arabic and grade 11 we also do AS math then grade 12 we do APs .. its a big load i know but what can i do :D
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Offline Shazizzzle

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1381 on: May 25, 2010, 05:43:41 pm »
Good Luck! :)
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Offline jellybeans

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1382 on: May 25, 2010, 05:44:03 pm »
Quote from: weaam on May 25, 2010, 05:27:43 pm
Can someone please explain Q 19,29,31,34 O/N 07?
Thank you.  ;)

HI- for Q19, its B , cuz steel's the ONLY one that conducts heat out of the four!
Q 31, its B, cuz there are 2 resistors in SERIES and it has the greatest combined resistance so current is reduced
Q 34, its A cuz ... less resistance hence less heat loss (overheating) ...
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Offline jellybeans

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1383 on: May 25, 2010, 05:45:40 pm »
Quote from: MasterMath on May 25, 2010, 05:39:25 pm
My school is weird .. we do Physics chem bio O'levels at grade 11 , Grade 10 Computer studies math english arabic and grade 11 we also do AS math then grade 12 we do APs .. its a big load i know but what can i do :D

AHAHA wow, sounds.. complicated XD LOL but oh well, at least ure learning more stuff than us XD
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Offline MasterMath

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1384 on: May 25, 2010, 05:46:25 pm »
Quote from: jellybeans on May 25, 2010, 05:35:03 pm
:o :o :o :o :o
lol sry. which one's the optcial axis & which one's the center?? >_<
D:<

Uggh how do i add a picture on my desktop?
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Offline jellybeans

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1385 on: May 25, 2010, 05:48:16 pm »
Quote from: MasterMath on May 25, 2010, 05:46:25 pm
Uggh how do i add a picture on my desktop?

um um um ... to ur desktop? or up here?
if youre talking bout sf then... its right above the "post" and "preview" buttons ... "additional options" ? and attach a fileeee :B
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1386 on: May 25, 2010, 05:50:28 pm »
Quote from: weaam on May 25, 2010, 05:27:43 pm
Can someone please explain Q 19,29,31,34 O/N 07?
Thank you.  ;)

29) C .. always for ohmic conductors the graph is the way shown in the diag. Ohmic conductors are conductors that follow the ohms law .. ohms law states R=V/I .. V is directly proportional to I
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Offline MasterMath

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1387 on: May 25, 2010, 05:51:11 pm »
And dont laugh at my drawing ... its freehand didnt have time to make it perfect .. tell me if you dont understand it ..
It explains where the Optical Focus is
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Offline Weaam

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1388 on: May 25, 2010, 05:53:29 pm »
Quote from: jellybeans on May 25, 2010, 05:44:03 pm
HI- for Q19, its B , cuz steel's the ONLY one that conducts heat out of the four!
Q 31, its B, cuz there are 2 resistors in SERIES and it has the greatest combined resistance so current is reduced
Q 34, its A cuz ... less resistance hence less heat loss (overheating) ...

For Q34, doesnt the resistance increase with thicker wire?
And thanks! ;)
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Offline Lariemeeva

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1389 on: May 25, 2010, 05:54:01 pm »
Can anyone explain to me Electromagnetic Effects in short? Probably a summery or something similar ...
I have an idea about it but I get so confused and this is by far the only topic that I haven't studied well...
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1390 on: May 25, 2010, 05:54:14 pm »


black line is the Optical Axis .. green is parallel to it which converges .. am i right Master ??
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Offline jellybeans

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1391 on: May 25, 2010, 05:55:08 pm »
Quote from: weaam on May 25, 2010, 05:53:29 pm
For Q34, doesnt the resistance increase with thicker wire?
And thanks! ;)

haha, nopes :D resistance - increase in increasing length of wire & temperature, &decreasing in diameter.
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Offline Shazizzzle

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1392 on: May 25, 2010, 05:57:19 pm »
Umm, should the p.d for creating cathode rays in a vacuum be a.c or d.c, and why?
There was this question, Q36 in O/N 2009, P 12 (VARIANT 2).
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Offline jellybeans

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1393 on: May 25, 2010, 05:57:51 pm »
Quote from: MasterMath on May 25, 2010, 05:51:11 pm
And dont laugh at my drawing ... its freehand didnt have time to make it perfect .. tell me if you dont understand it ..
It explains where the Optical Focus is

hahahaha- like your handwriting. THANKS ;D
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1394 on: May 25, 2010, 05:58:32 pm »
Quote from: weaam on May 25, 2010, 05:53:29 pm
For Q34, doesnt the resistance increase with thicker wire?
And thanks! ;)

29) C .. always for ohmic conductors the graph is the way shown in the diag. Ohmic conductors are conductors that follow the ohms law .. ohms law states R=V/I .. V is directly proportional to I

When the diameter of the wire or the cross sectional area is greater the resistance decreases .. how ?? as the area is increased there is more 'space' for the electrons to move through the wire so not much resistance for them to block their path ..vise versa as the diameter deceases
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