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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 228982 times)

Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1065 on: May 24, 2010, 04:08:53 pm »
Quote from: A@di on May 24, 2010, 04:05:43 pm
Yes, thats exactly wat i said. Whats the confusion about?

applying V-I*R, when R decreases (thermistor), the Voltage decreases. So, the other part, Vbe , the variable resistor part gets more voltage, and if V>0.6V is flowing throught the emitter of the transistor, the transistor switches on.

i got it !! jut one last thing i want to clear.

if teh voltage accroos the variable resistor is HIGHT does that mean voltage across Vbe will be high?
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1066 on: May 24, 2010, 04:11:31 pm »
Quote from: Kimo Jesus on May 24, 2010, 04:08:53 pm
i got it !! jut one last thing i want to clear.

if teh voltage accroos the variable resistor is HIGHT does that mean voltage across Vbe will be high?

yes, actually, the voltage across Vb/e is high, as the variable resistor is a part of that side, v also say the voltage across Variable resistor is high.
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1067 on: May 24, 2010, 04:16:23 pm »
Quote from: ang3l on May 24, 2010, 04:08:15 pm
http://www.freeexampapers.us/IGCSE/Physics/CIE/2006%20Nov/0625_w06_qp_1.pdf

Q15 Why is it D?

Q18 ans and Explaination

Q31 ans and Explaination

Thx :)





THE HEAT GIVEN AT MELTING POINTS AND BOIILING POINTS IS CALLED LATENT HEAT / ENERGY

the heat is used to BREAK BONDS between molecules in order t chnage state .It is not used to give kinteic energy to molecules therfore doesnt heat the molecules up and no temp rise

18- C??? best for convectional currents if u dotn kno ask

IS D THE ASNWER OF 31
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1068 on: May 24, 2010, 04:19:11 pm »
Quote from: A@di on May 24, 2010, 04:11:31 pm
yes, actually, the voltage across Vb/e is high, as the variable resistor is a part of that side, v also say the voltage across Variable resistor is high.
oki doki ..thanks man AGAIN

i thought i got this before but hmm :/

should be fine now ;)
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1069 on: May 24, 2010, 04:24:11 pm »
Quote from: Kimo Jesus on May 24, 2010, 04:19:11 pm
oki doki ..thanks man AGAIN

i thought i got this before but hmm :/

should be fine now ;)

no problem
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1070 on: May 24, 2010, 04:24:37 pm »
Quote from: Kimo Jesus on May 24, 2010, 04:16:23 pm
THE HEAT GIVEN AT MELTING POINTS AND BOIILING POINTS IS CALLED LATENT HEAT / ENERGY

the heat is used to BREAK BONDS between molecules in order t chnage state .It is not used to give kinteic energy to molecules therfore doesnt heat the molecules up and no temp rise

18- C??? best for convectional currents if u dotn kno ask

IS D THE ASNWER OF 31

Okey i get the first one
And 18 is C but why  ???
and 31 also can u explain a bit? y D
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1071 on: May 24, 2010, 04:40:44 pm »
Quote from: ang3l on May 24, 2010, 04:24:37 pm
Okey i get the first one
And 18 is C but why  ???
and 31 also can u explain a bit? y D

for the circuit to be complete, the current shud move from positive, through all the lamps, lastly through D, and to the negative.

If D breaks, the circuit isnt complete.
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1072 on: May 24, 2010, 04:42:37 pm »
Quote from: ang3l on May 24, 2010, 04:24:37 pm
Okey i get the first one
And 18 is C but why  ???
and 31 also can u explain a bit? y D

ok u know it has to be smewhere low for the warm air to rise and spread all over. the only two low points are D and C. answer is C because from C, there is a path for the warm air  to rise...it can also spread horizontally and spread.
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1073 on: May 24, 2010, 04:48:03 pm »
Ahh...Get it :D
Thx
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1074 on: May 24, 2010, 05:01:58 pm »
Ur welcome.
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1075 on: May 24, 2010, 05:43:02 pm »
http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Jun/0625_s09_qp_1.pdf
(First Variant)

Q11: The answer is B but i dnt get one thing..Isnt the level of mercury supposed to be lower since the diameter of tube increased?

Q34

thx
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1076 on: May 24, 2010, 05:48:35 pm »
Area has no effect on pressure ;)
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1077 on: May 24, 2010, 05:55:14 pm »
Quote from: ang3l on May 24, 2010, 05:43:02 pm
http://www.freeexampapers.us/IGCSE/Physics/CIE/2009%20Jun/0625_s09_qp_1.pdf
(First Variant)

Q11: The answer is B but i dnt get one thing..Isnt the level of mercury supposed to be lower since the diameter of tube increased?

Q34

thx
yes in a liquid !!


ari do u have figures or formulas by which u can prove that ??


for q 34

its C

the curl ur fingers rule

ince current is goin upper  do a thumbs up!! lookk how ur fingers curl..they curl anti clock wise ..draw circle around the wire and ull find the answer

1x10^ 5= M X G  X H

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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1078 on: May 24, 2010, 06:12:23 pm »
Quote from: Kimo Jesus on May 24, 2010, 05:55:14 pm
yes in a liquid !!


ari do u have figures or formulas by which u can prove that ??


for q 34

its C

the curl ur fingers rule

ince current is goin upper  do a thumbs up!! lookk how ur fingers curl..they curl anti clock wise ..draw circle around the wire and ull find the answer

1x10^ 5= M X G  X H



I still dont get Q34 sorry  ???
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1079 on: May 24, 2010, 06:14:21 pm »
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