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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 231512 times)

Offline 8T

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2145 on: May 26, 2010, 07:56:44 pm »
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Offline rhea

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2146 on: May 26, 2010, 07:56:58 pm »
Quote from: Adzel on May 26, 2010, 07:55:09 pm
Split rings = half turns = DC motor

umm, but arent split rings there to change direction of I so that coil can take full-turns?
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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2147 on: May 26, 2010, 07:57:35 pm »
Quote from: rhea on May 26, 2010, 07:56:58 pm
umm, but arent split rings there to change direction of I so that coil can take full-turns?

Split rings reverse the direction of current every half-revolution so the coil keeps spinning in one direction, got it?
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2148 on: May 26, 2010, 07:57:44 pm »
Quote from: mdwael on May 26, 2010, 07:14:26 pm
Can someone please explain me questsion 1 b iv part in oct nov 2006 paper 3 physics? what is cork and how do you find its density ???

Quote from: 6394 on May 26, 2010, 07:34:54 pm
0625/32/M/J/09  ques 7 b pleazz
i noe de fact dat evaporation is a coollin effect
bt dint gt de othr parts of ms!!!!!!

Quote from: mdwael on May 26, 2010, 07:44:06 pm
There is this experiment in oct nov 2006 question 5 (b) how do you carry it out? what do you have to draw, the MS is not clear.. can someone please do it for me?

all answered ??
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Offline rhea

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2149 on: May 26, 2010, 07:59:04 pm »
umm, by same direction u mean full turns?

im sorry...just never got this split ring thing..
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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2150 on: May 26, 2010, 07:59:59 pm »
Quote from: rhea on May 26, 2010, 07:59:04 pm
umm, by same direction u mean full turns?

im sorry...just never got this split ring thing..

Motor turns in one direction, one turn is one revolution.  Just keeps turing one direction, alright?
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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2151 on: May 26, 2010, 08:00:30 pm »
Quote from: Ivo on May 26, 2010, 07:44:49 pm
So Boyle's Law is that if temperature is constant, then when volume decreases, pressure increases?

This question hasn't been answered yet.  please somebody
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Offline diva_sparkles

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2152 on: May 26, 2010, 08:01:28 pm »
Quote from: Ivo on May 26, 2010, 08:00:30 pm
This question hasn't been answered yet.  please somebody
yes!
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6394

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2153 on: May 26, 2010, 08:01:34 pm »
Quote from: thenewkid™ on May 26, 2010, 07:46:05 pm
the cloth always remains damp because it is dipped in water on  both side
the energy required for the molecules to evaporate is obtained from the milk
hope this helps
the energy required for the molecules to evaporate is obtained from the milk
aisa kab hota hai
new to me ;)
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Offline NightHawkerr

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2154 on: May 26, 2010, 08:02:28 pm »
oh okay thanks.
One more question.
In past papers, where they ask us to draw resultant forces using parallelogram method, how exactly do we find the mag and direction of resultant force? Like in M/J 2009 Q 4ai)
 ???
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Offline Adzel

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2155 on: May 26, 2010, 08:02:48 pm »
Quote from: rhea on May 26, 2010, 07:56:58 pm
umm, but arent split rings there to change direction of I so that coil can take full-turns?

Nope those are called slip rings...Dont get mixed up!
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Offline thenewkid™

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2156 on: May 26, 2010, 08:03:24 pm »
Quote from: 8T on May 26, 2010, 07:56:44 pm
Are You Sure??
yes
objects tht hv internal energy are like a hot water bottle
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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2157 on: May 26, 2010, 08:03:56 pm »
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Always willing to help!  8)
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2158 on: May 26, 2010, 08:04:00 pm »
Quote from: 6394 on May 26, 2010, 08:01:34 pm
the energy required for the molecules to evaporate is obtained from the milk
aisa kab hota hai
new to me ;)

The milk stays cool, because the water molecules in the damp cloth use the heat energy from the SUN to evaporate.

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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2159 on: May 26, 2010, 08:05:50 pm »
Quote from: NightHawkerr on May 26, 2010, 08:02:28 pm
oh okay thanks.
One more question.
In past papers, where they ask us to draw resultant forces using parallelogram method, how exactly do we find the mag and direction of resultant force? Like in M/J 2009 Q 4ai)
 ???

draw the parallelogram using the scale. The direction is the diagonal of the parallelogram, and the magnitude is its length(use the scale to convert it into Newtons)

draw the scale diagram as shown

measure the length of the diagonal and calculate the force accordingly

measure the angle

shud be

-> 5500N
--> 30o

attached
« Last Edit: May 26, 2010, 08:08:00 pm by A@di »
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