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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 225681 times)

Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1440 on: May 25, 2010, 07:02:19 pm »
Quote from: deadman786 on May 25, 2010, 06:59:46 pm
hahaha you see that's the problem :D. What exactly do you mean by direction??? A current in a wire will flow through the wire right?? It won't exactly change direction and move west or east?? LOL :D.

So what i can get from your answer is that  say 1 terminal is positive then it becomes negative then again positive and so on... But there's just one problem. Won't it just move backwards and forwards (the current)?? Like one step ahead then 1 step back?? LOL :D.

(Please really sorry to disturb all of you guys but I've never understood this (from Grade 6) and I believe if I don't clear this doubt now, it'll haunt me for the rest of my life)...

nonono! haha, look, the current for the first round will move from positive to negative terminal , next, it will move from negative to positive, this keeps on happening..
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1441 on: May 25, 2010, 07:02:48 pm »
People. I am sleepy, I feel drunk and I really want to go to SLEEEP !!!

So please answer this question of mine before I smash the laptop :


Why is it 600 V DC between the cathode and anode of a CRO ???

Specifically WHY DC ?? WHY NOT AC
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1442 on: May 25, 2010, 07:05:09 pm »
Quote from: Ari Ben Canaan on May 25, 2010, 07:02:48 pm
People. I am sleepy, I feel drunk and I really want to go to SLEEEP !!!

So please answer this question of mine before I smash the laptop :


Why is it 600 V DC between the cathode and anode of a CRO ???

Specifically WHY DC ?? WHY NOT AC

dude u cant have alternating POLES for A CRO!!!!!!

do u want the elctrons to keep flyin form one directio another??

no

for DC

U HAVE 1 FIXED NEGATIVE POLE ( CATHODE ) AND ONE ANODE ( POSOTIVE)

ELECTRONS MOVE FROOM NEGATIVE TO POSOTIVE
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Offline Shazizzzle

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1443 on: May 25, 2010, 07:07:23 pm »
Quote from: A@di on May 25, 2010, 07:02:19 pm
nonono! haha, look, the current for the first round will move from positive to negative terminal , next, it will move from negative to positive, this keeps on happening..

OOHHHH!
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1444 on: May 25, 2010, 07:08:31 pm »
Quote from: Kimo Jesus on May 25, 2010, 07:05:09 pm
dude u cant have alternating POLES for A CRO!!!!!!

do u want the elctrons to keep flyin form one directio another??

no

for DC

U HAVE 1 FIXED NEGATIVE POLE ( CATHODE ) AND ONE ANODE ( POSOTIVE)

ELECTRONS MOVE FROOM NEGATIVE TO POSOTIVE

Oh *censored* I didnt think about that, I am so tired....

Thanks man - now I can sleep.

GOOD NIGHT AND BEST OF LUCK TO ALL OF YOU !!!!!
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Offline ambitious94

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1445 on: May 25, 2010, 07:09:27 pm »
Nov 2005.
15 A knife is being sharpened on a rotating sharpening-stone. A spark flies off and lands on the
operator’s hand. The spark is a very hot, very small piece of metal. The operator feels nothing.
What does this show about the piece of metal?
A It has a high thermal capacity.
B It has a low thermal capacity.
C It is a good conductor of heat.
D It is a poor conductor of heat.

Why is it B? :S

and Q31, why does the bulb become brighter? :S
Thanks in advance  ;D
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Offline diva_sparkles

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1446 on: May 25, 2010, 07:09:47 pm »
Quote from: Kimo Jesus on May 25, 2010, 07:05:09 pm
dude u cant have alternating POLES for A CRO!!!!!!

u can hv alternating current 4 a CRO!!!BUT thts 4 da y n x plates
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1447 on: May 25, 2010, 07:10:36 pm »
Quote from: Ari Ben Canaan on May 25, 2010, 07:08:31 pm
Oh f**k I didnt think about that, I am so tired....

Thanks man - now I can sleep.

GOOD NIGHT AND BEST OF LUCK TO ALL OF YOU !!!!!

Imma sleep too...Good night guyz. Best of luck.. !!
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Offline 8T

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1448 on: May 25, 2010, 07:12:18 pm »
Help with O/n 03 q 27 .. ans is  B .. WHY ?
Thanks in advance!
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1449 on: May 25, 2010, 07:13:06 pm »
Quote from: Kimo Jesus on May 25, 2010, 07:05:09 pm
dude u cant have alternating POLES for A CRO!!!!!!

do u want the elctrons to keep flyin form one directio another??


lmao..... :D:D
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6394

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1450 on: May 25, 2010, 07:14:33 pm »
Quote from: A@di on May 25, 2010, 07:10:36 pm
Imma sleep too...Good night guyz. Best of luck.. !!
u guyz seepppin lol i gt up nw n will prepare :P :P :P ;D for tom
......gud luk 2 u as wel
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1451 on: May 25, 2010, 07:16:58 pm »
Quote from: 6394 on May 25, 2010, 07:14:33 pm
u guyz seepppin lol i gt up nw n will prepare :P :P :P ;D for tom
......gud luk 2 u as wel

I have already given my IGCSEs :D
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6394

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1452 on: May 25, 2010, 07:17:13 pm »
Quote from: Kimo Jesus on May 25, 2010, 07:05:09 pm
dude u cant have alternating POLES for A CRO!!!!!!

do u want the elctrons to keep flyin form one directio another??

no

for DC

U HAVE 1 FIXED NEGATIVE POLE ( CATHODE ) AND ONE ANODE ( POSOTIVE)

ELECTRONS MOVE FROOM NEGATIVE TO POSOTIVE
rofl
i told u!!!!
dat u r a funny teachr  :P ;D :D ;)
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1453 on: May 25, 2010, 07:17:36 pm »
Quote from: ambitious94 on May 25, 2010, 07:09:27 pm
Nov 2005.
15 A knife is being sharpened on a rotating sharpening-stone. A spark flies off and lands on the
operator’s hand. The spark is a very hot, very small piece of metal. The operator feels nothing.
What does this show about the piece of metal?
A It has a high thermal capacity.
B It has a low thermal capacity.
C It is a good conductor of heat.
D It is a poor conductor of heat.

Why is it B? :S

and Q31, why does the bulb become brighter? :S
Thanks in advance  ;D

As soon as the metal files off the stone it gets cooled .. hence the person doesnt feel anything .. It has a low thermal capacity meaning looses fast  
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6394

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1454 on: May 25, 2010, 07:18:57 pm »
Quote from: A@di on May 25, 2010, 07:16:58 pm
I have already given my IGCSEs :D
ooohkk
lol
so hlpin us haan!!!! :) ;) :D
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