Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 230644 times)

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1440 on: May 25, 2010, 07:02:19 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..
divine intervention!

holtadit

  • Guest
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

Offline WARRIOR

  • SF Master
  • ******
  • Posts: 1473
  • Reputation: 51196
  • Egyptian And so damn proud . I love you jesus!
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1442 on: May 25, 2010, 07:05:09 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
NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa

Offline Shazizzzle

  • SF Citizen
  • ***
  • Posts: 204
  • Reputation: 1444
  • Gender: Male
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1443 on: May 25, 2010, 07:07:23 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!
•$#@2™•

holtadit

  • Guest
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1444 on: May 25, 2010, 07:08:31 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 !!!!!

Offline ambitious94

  • SF Immigrant
  • **
  • Posts: 78
  • Reputation: 120
  • Gender: Female
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

Offline diva_sparkles

  • SF Citizen
  • ***
  • Posts: 214
  • Reputation: 240
  • Gender: Female
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1446 on: May 25, 2010, 07:09:47 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
Don’t ask what the world needs. Ask what makes you come alive, and go do it. Because what the world needs is people who have come alive!!

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1447 on: May 25, 2010, 07:10:36 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.. !!
divine intervention!

Offline 8T

  • SF Citizen
  • ***
  • Posts: 148
  • Reputation: 162
  • Gender: Female
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!
Know how to ask. There is nothing more difficult for some people, nor for others, easier.

Offline Malak

  • Honorary Member
  • SF Farseer
  • *****
  • Posts: 4454
  • Reputation: 65534
  • A warm smile is the universal language of kindness
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1449 on: May 25, 2010, 07:13:06 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
If you are a man who degrades women then allow me to respectfully remind you that you came from ONE

Reminder to myself: Stop worrying and start working

SF magazine 2012 - Download here

6394

  • Guest
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1450 on: May 25, 2010, 07:14:33 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

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1451 on: May 25, 2010, 07:16:58 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
divine intervention!

6394

  • Guest
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1452 on: May 25, 2010, 07:17:13 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 ;)

Offline Vin

  • SF V.I.P
  • ********
  • Posts: 7914
  • Reputation: 52609
  • Gender: Male
    • Theory of Life - A new skew.
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1453 on: May 25, 2010, 07:17:36 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  

6394

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