« previous next »
Pages: 1 ... 82 83 [84] 85 86 ... 160   Go Down

Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 229311 times)

Offline rhea

  • SF Immigrant
  • **
  • Posts: 66
  • Reputation: 82
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1245 on: May 25, 2010, 03:50:57 pm »
Quote from: Raywin on May 25, 2010, 03:46:46 pm
Hmmm... Vernier calipers can measure internal dimensions (using the uppermost jaws in the picture given), external dimensions using the pictured lower jaws, depth measurements by the use of a probe that is attached to the movable head and slides along the centre of the body. This probe is slender and can get into deep grooves that may prove difficult for other measuring tools.
The vernier scales may include both metric and inch measurements on the upper and lower part of the scale.
Vernier calipers commonly used in industry provide a precision to a hundredth of a millimetre (10 micrometres), or one thousandth of an inch.
A more precise instrument used for the same purpose is the micrometer. I hope this info helps googled it.. ;) check the picture attached..


yes!!
thankyou!  ;D ;D ;D ;D
Logged

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 #1246 on: May 25, 2010, 03:51:09 pm »


spectrum
Logged

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1247 on: May 25, 2010, 03:52:42 pm »
Quote from: 8T on May 25, 2010, 03:48:26 pm
Is any1 free enough to post for me the electromagnetic spectrum in order of frequency and wavelenth .
I know that one goes opposite to the other .
Plus,an explanation of total internal reflection is helpful too.
Thanks in advance.

high frequency                                                                                                                                      low frequency
short wavelength                                                                                                                                 long wavelength

Gamma  ------------- X-Rays ---------- UV ------- Visible Rays -------- Infrared rays ------- Microwaves ------ Radio Waves
Logged
divine intervention!

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 #1248 on: May 25, 2010, 03:55:25 pm »
Quote from: Adzel on May 25, 2010, 03:36:20 pm
@ VIN: the resistance is always directly proportional to the P.D...

I thought current is directly proportional to p.d  :-\
Logged

Offline Fastal

  • SF Citizen
  • ***
  • Posts: 181
  • Reputation: 341
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1249 on: May 25, 2010, 03:57:36 pm »
Quote from: ~VIN1094~ on May 25, 2010, 03:55:25 pm
I thought current is directly proportional to p.d  :-\
it depends on how you look at it, i think you both are right in some ways

when the resistance of an appliance is hight the potential for that appliance compared to others is high

and if there is one appliance, the higher p.d=higher current
« Last Edit: May 25, 2010, 04:02:22 pm by Fastal »
Logged

Offline guMnam

  • !!~~**~~!!
  • SF Farseer
  • *******
  • Posts: 4242
  • Reputation: 12471
  • Gender: Male
  • !!~~guMnam~~!!
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1250 on: May 25, 2010, 03:58:37 pm »
Quote from: ~VIN1094~ on May 25, 2010, 03:55:25 pm
I thought current is directly proportional to p.d  :-\
yes it is....ohm s law
Logged

I <3 Challenges
Never give up :)

holtadit

  • Guest
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1251 on: May 25, 2010, 03:59:27 pm »
Quote from: ~VIN1094~ on May 25, 2010, 03:55:25 pm
I thought current is directly proportional to p.d  :-\


VOLTAGE is DIRECTLY PROPORTIONAL TO CURRENT.


Only if Resistance is CONSTANT !!!!!
Logged

holtadit

  • Guest
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1252 on: May 25, 2010, 04:00:14 pm »
Why is it D and NOT B
Logged

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1253 on: May 25, 2010, 04:00:23 pm »
Quote from: Ari Ben Canaan on May 25, 2010, 03:59:27 pm

VOLTAGE is DIRECTLY PROPORTIONAL TO CURRENT.


Only if Resistance is CONSTANT !!!!!

And voltage is directly proportional to Resistance if Current is constant

V=I*R
Logged
divine intervention!

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1254 on: May 25, 2010, 04:01:26 pm »
Quote from: Ari Ben Canaan on May 25, 2010, 04:00:14 pm
Why is it D and NOT B

B is a possibility , D is certain to happen. Simple.
Logged
divine intervention!

Offline Baladya

  • meawwwww hao hao >.<
  • SF Geek
  • ****
  • Posts: 554
  • Reputation: 681
  • Gender: Male
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1255 on: May 25, 2010, 04:02:04 pm »
Quote from: Ari Ben Canaan on May 25, 2010, 04:00:14 pm
Why is it D and NOT B

Ya i was going to say that, B is right, but D is more of the right answer :P
Logged
Looks like i ran out of cool signatures :|

Offline guMnam

  • !!~~**~~!!
  • SF Farseer
  • *******
  • Posts: 4242
  • Reputation: 12471
  • Gender: Male
  • !!~~guMnam~~!!
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1256 on: May 25, 2010, 04:02:56 pm »
okay....if we place a resistor in a circuit ...does the curent decrease...or does the p.d decrease ???
Logged

I <3 Challenges
Never give up :)

Offline Ivo

  • SF Geek
  • ****
  • Posts: 515
  • Reputation: 2767
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1257 on: May 25, 2010, 04:03:41 pm »
Can someone please explain the V=I^2R formula, and how this relates to heat loss in electric cables.  This is mainly for Paper 3, many thanks in advance.
Logged
Always willing to help!  8)
"In helping others, we shall help ourselves, for whatever good we give out completes the circle and comes back to us."

Offline Ivo

  • SF Geek
  • ****
  • Posts: 515
  • Reputation: 2767
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1258 on: May 25, 2010, 04:04:15 pm »
Quote from: guMnam on May 25, 2010, 04:02:56 pm
okay....if we place a resistor in a circuit ...does the curent decrease...or does the p.d decrease ???

It depends if the circuit is series or parallel.
Logged
Always willing to help!  8)
"In helping others, we shall help ourselves, for whatever good we give out completes the circle and comes back to us."

holtadit

  • Guest
Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1259 on: May 25, 2010, 04:05:22 pm »
Quote from: Ivo on May 25, 2010, 04:03:41 pm
Can someone please explain the V=I^2R formula, and how this relates to heat loss in electric cables.  This is mainly for Paper 3, many thanks in advance.

Firstly, its P=I2R

Logged
Pages: 1 ... 82 83 [84] 85 86 ... 160   Go Up
« previous next »