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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 229287 times)

Offline rhea

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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
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1246 on: May 25, 2010, 03:51:09 pm »


spectrum
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Offline Ghost Of Highbury

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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
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Offline Vin

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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  :-\
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Offline Fastal

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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 »
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Offline guMnam

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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
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holtadit

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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 !!!!!
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holtadit

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

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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
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Offline Ghost Of Highbury

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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.
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Offline Baladya

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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
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Offline guMnam

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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 ???
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Offline Ivo

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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.
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Offline Ivo

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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.
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holtadit

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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

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