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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 238254 times)

Offline Weaam

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2355 on: May 27, 2010, 08:23:49 am »
Back from the exaam!  ;D
No more physicsss! yesss!  ;D
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Offline CatAly$t

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2356 on: May 27, 2010, 08:25:13 am »
can anybody tell me about commutators?
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Offline Helium

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2357 on: May 27, 2010, 08:30:04 am »
Quote from: CatAly$t on May 27, 2010, 08:25:13 am
can anybody tell me about commutators?

A commutator makes sure the current in the brush contacts always flow in the same way,
like in a simple d.c. dynamo
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Offline J.Darren

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2358 on: May 27, 2010, 08:35:21 am »
Quote from: weaam on May 27, 2010, 08:23:49 am
Back from the exaam!  ;D
No more physicsss! yesss!  ;D

No more physics !! P3 is easier compared to P1 I would say :D
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Offline Helium

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2359 on: May 27, 2010, 08:43:46 am »
Quote from: J.Darren on May 27, 2010, 08:35:21 am
No more physics !! P3 is easier compared to P1 I would say :D

You saying that makes me confindent, Thanks ;D
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Offline Weaam

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2360 on: May 27, 2010, 08:47:47 am »
Quote from: J.Darren on May 27, 2010, 08:35:21 am
No more physics !! P3 is easier compared to P1 I would say :D
It wasnt :O
To me, physics all of it was really BAD!
I screwed up BIG!
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- The man who smiles when things go wrong has thought of someone to blame it on. - Robert Bloch.
-I saw weird stuff in that place last night. Weird, strange, sick, twisted, eerie, godless, evil stuff... and I went in. - Homer
+ Rep me if i have been of any assistance to you ;D

Offline The Golden Girl =D

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2361 on: May 27, 2010, 08:50:33 am »
Quote from: weaam on May 27, 2010, 08:47:47 am
It wasnt :O
To me, physics all of it was really BAD!
I screwed up BIG!

let's not say anything ....cuz ome say it was easy some so no it was hard ...... Helium be confident ....

i really hope everyone here does well ....Allah ma3aku ;)
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Offline guMnam

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2362 on: May 27, 2010, 08:50:51 am »
it was baddd like hell....urghhhh
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Offline Mathewness

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2363 on: May 27, 2010, 08:58:32 am »
Paper 05 november. Can someone help me out here? Question 2c; i know the direction of the force is downwards but how do we find the magnitude of force?
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Offline Dana

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2364 on: May 27, 2010, 09:03:58 am »
Quote from: Adzel on May 26, 2010, 08:02:48 pm
Nope those are called slip rings...Dont get mixed up!
Nono! Split rings make sure he motor keep turning. Slip rings are in a generator
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Offline Dana

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2365 on: May 27, 2010, 09:09:39 am »
Quote from: NightHawkerr on May 26, 2010, 07:49:34 pm
LDR :

As Light intensity decreases on LDR, The resistance across it increases, thus V input increases. When V input is more than 0.6 V, the transistor is switched ON, and thus the lamp/ alarm etc. turns ON.
Thaanks so much, but the transistor thing is confusing, when the base current increases does the collector current increase or decrease??  ??? do you mind explaining that part please?
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Offline Dana

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2366 on: May 27, 2010, 09:12:15 am »
And you guys there are 2 wires going through a paper, both of them are now connected to a battery source. The current is going down both. Why and in what direction does the flexible wire move? its so confusingg ??? MJ 08 qs 9) c)
Pleaseee answerr! Thanks in advance
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Offline CatAly$t

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2367 on: May 27, 2010, 09:13:59 am »
who can answer this question(part c)??8)
« Last Edit: May 27, 2010, 09:15:57 am by CatAly$t »
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Offline Dana

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2368 on: May 27, 2010, 09:18:16 am »
Quote from: CatAly$t on May 27, 2010, 09:13:59 am
who can answer this question??? 8)
To calculate the current you need either power/ voltage and/or resistance. They might've given you that information previously. If you know the power and the voltage is given (12) then use the power formula. If they gave you the resistance then use the second formula
P=IV or V=IR
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2369 on: May 27, 2010, 09:24:10 am »
Quote from: Dana on May 27, 2010, 09:12:15 am
And you guys there are 2 wires going through a paper, both of them are now connected to a battery source. The current is going down both. Why and in what direction does the flexible wire move? its so confusingg ??? MJ 08 qs 9) c)
Pleaseee answerr! Thanks in advance

https://studentforums.biz/index.php/topic,7291.msg196914.html#msg196914
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