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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 228731 times)

Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #945 on: May 22, 2010, 10:48:32 am »
Quote from: ~VIN1094~ on May 22, 2010, 10:43:24 am
the ques means means that wen a p.d of 4V is provided to the lamp wat is the resistance as the current in the circuit .. after thinking a lot i think it means wat u r saying .. =\


lol ok ! man i used to find electricty way easier whn i studied less and i used to get asnwer right! now that i become precise about evrything i  make mistakes..

ill send you one of the harder circuit questions later !
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Offline Baladya

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #946 on: May 22, 2010, 10:50:47 am »
Quote from: Kimo Jesus on May 22, 2010, 10:21:36 am
dont get what are you ssaying

Look for the voltage  aroudn teh battery is obviously 12V
And for teh capacitator it will be 12..because you close the switch teh capacitatore becomes charged till it becomes 12v now when you open the switch .  The capacitator will be 12V and ready to dissipate its voltage any time .

Resistor has no resistance unless a current passes through it , so how willi t have voltage???

Lol i read the question wrong :P Thx very much :)
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Offline $H00t!N& $t@r

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #947 on: May 22, 2010, 11:07:23 am »
p1 2009 o/n  question 10

how can the output be electrical???
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #948 on: May 22, 2010, 11:16:20 am »
Quote from: Shooting Star on May 22, 2010, 11:07:23 am
p1 2009 o/n  question 10

how can the output be electrical???

its asked IN the microphone .. sound energy (while the person speaks) in converted to electrical energy .. y ?? because the microphone has to send the "information" to the through the WIRES .. they can carry ony electrical energy .. to the speaker .. then elec to sound takes place in a loud speaker ..   
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Offline Baladya

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #949 on: May 22, 2010, 11:20:00 am »
Quote from: Shooting Star on May 22, 2010, 11:07:23 am
p1 2009 o/n  question 10

how can the output be electrical???

This is the same as LDR  and the thermistor. They receive analoge stuff like sound, heat, light (stuff we can sense) and convert it into electricity. Here it is converted to electricity so it can be modified, and becomes sound again (later) but louder
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Offline $H00t!N& $t@r

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #950 on: May 22, 2010, 11:21:21 am »
ohhhhh IN THE MICROPHONE i dint see that part Thanks  ;D
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #951 on: May 22, 2010, 11:31:21 am »
Quote from: Baladya on May 22, 2010, 11:20:00 am
This is the same as LDR  and the thermistor. They receive analoge stuff like sound, heat, light (stuff we can sense) and convert it into electricity. Here it is converted to electricity so it can be modified, and becomes sound again (later) but louder

Quote from: Shooting Star on May 22, 2010, 11:21:21 am
ohhhhh IN THE MICROPHONE i dint see that part Thanks  ;D


yup they are called transducers .. ;)
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #952 on: May 22, 2010, 12:02:19 pm »
Winter 1999

QUESTION 3 ( A)
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #953 on: May 22, 2010, 12:15:43 pm »
Quote from: Kimo Jesus on May 22, 2010, 12:02:19 pm
Winter 1999

QUESTION 3 ( A)

is it 160 ??
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Offline SoONa

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #954 on: May 22, 2010, 12:33:42 pm »
hello .... i really dont get the part in uses of electromagnets that has the use of electric bell and shows the processs ?? what am i suppose to know and whyyy ?? is their a question about it in past papers????....

it really confuses me .. thanks in advance and goodluck all hope we rock the exam  ;D
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #955 on: May 22, 2010, 12:46:50 pm »
Quote from: ~VIN1094~ on May 22, 2010, 12:15:43 pm
is it 160 ??

yeaah how did u calcualte that?? u extended it ?
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But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa

Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #956 on: May 22, 2010, 12:53:39 pm »


see in this image when the switch is turned on the circuit gets completed and the soft iron core gets magnetised. the soft iron armature gets attracted to the core and the bell rings once .. *ting* ..notice that the "contacts" looses contact with the spring and the circuit is broken and the iron is demagnetised and the armature returns back to its original position as shown in the pic. notice the circuit is complete again and this cycle continues .. if u might hav heard a bell in school u get multiple *tings* so rapidly !! this is wat all happens again n again at such high frequency .. ;)

BEST OF LUCK !! :D :D  
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #957 on: May 22, 2010, 12:55:43 pm »
Quote from: ~VIN1094~ on May 22, 2010, 12:53:39 pm


see in this image when the switch is turned on the circuit gets completed and the soft iron core gets magnetised. the soft iron armature gets attracted to the core and the bell rings once .. *ting* ..notice that the "contacts" looses contact with the spring and the circuit is broken and the iron is demagnetised and the armature returns back to its original position as shown in the pic. notice the circuit is complete again and this cycle continues .. if u might hav heard a bell in school u get multiple *tings* so rapidly !! this is wat all happens again n again at such high frequency .. ;)

BEST OF LUCK !! :D :D  
yeaah how did u calcualte that?? u extended it ?
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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 Baladya

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #958 on: May 22, 2010, 01:27:23 pm »
http://www.freeexampapers.us/IGCSE/Physics/CIE/2007%20Jun/0625_s07_qp_1.pdf

27) u guys told me that plotting compasses always point to North. Well i chose A, but its B... WHY? Plz explain clearly :S
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #959 on: May 22, 2010, 01:33:08 pm »
Quote from: Kimo Jesus on May 22, 2010, 12:55:43 pm
yeaah how did u calcualte that?? u extended it ?

wats given in the ms ?? i got it by fluke .. now im getting 170 ?? anything given in the ms ??
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