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Author Topic: P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE  (Read 18113 times)

Offline halosh92

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Re: P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
« Reply #105 on: June 07, 2010, 06:55:34 pm »
Quote from: zxcvbnm on June 07, 2010, 06:47:34 pm
oh i realised that we can also use (2n+1)(lambda)/2...but i've forgotten what the n stands for...please clarify this asap!

no of orders maybe?
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everyday we wake up is a miracle, then how do we say miracles dont happen?????

Offline zxcvbnm

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Re: P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
« Reply #106 on: June 07, 2010, 06:59:57 pm »
yes, orders...
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Offline zxcvbnm

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Re: P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
« Reply #107 on: June 07, 2010, 07:21:16 pm »
june 09, 21, question 1,b,iii....shouldnt it be E1-E2=I1R-2I2R?
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Offline halosh92

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Re: P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
« Reply #108 on: June 07, 2010, 07:26:32 pm »
Quote from: zxcvbnm on June 07, 2010, 07:21:16 pm
june 09, 21, question 1,b,iii....shouldnt it be E1-E2=I1R-2I2R?

could u upload the paper plz?
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everyday we wake up is a miracle, then how do we say miracles dont happen?????

Offline zxcvbnm

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Re: P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
« Reply #109 on: June 07, 2010, 07:36:46 pm »
here...i did figure it out but not sure if i'm right
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Offline halosh92

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Re: P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
« Reply #110 on: June 07, 2010, 07:46:45 pm »
Quote from: zxcvbnm on June 07, 2010, 07:36:46 pm
here...i did figure it out but not sure if i'm right

Q1 ??? there is no such similar question
do u mean Q8?
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everyday we wake up is a miracle, then how do we say miracles dont happen?????

Offline zxcvbnm

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Re: P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
« Reply #111 on: June 07, 2010, 07:54:54 pm »
oh sorry! i meant 7...the one where we have to use kirchoff's second law....i figured it out....current entering=current leaving...but if you could still have a look
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Offline halosh92

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Re: P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
« Reply #112 on: June 07, 2010, 08:15:02 pm »
Quote from: zxcvbnm on June 07, 2010, 07:54:54 pm
oh sorry! i meant 7...the one where we have to use kirchoff's second law....i figured it out....current entering=current leaving...but if you could still have a look

yep its correct see if we take anticlockwise direction starting from E1
current is in the same direction so it will be
-I1R  and then it faces the (+) terminal of E2 so we take it as negative so next is -E2
then we face the next resistor but here the current is moving in the opposite direction to our  clockwise direction so it will be + I2R
then we face the next resistor, so the the current is the same direction to our chosen direction so it will be -I1R
and we then face the negative terminal of E1 so we take it as +E1
so we group them together
-I1R-E2+I2R-I1R+E1=0

got it?
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everyday we wake up is a miracle, then how do we say miracles dont happen?????

Offline zxcvbnm

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Re: P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
« Reply #113 on: June 07, 2010, 08:22:28 pm »
yup, thanx~!
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Offline halosh92

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Re: P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
« Reply #114 on: June 07, 2010, 08:28:16 pm »
Quote from: halosh92 on June 07, 2010, 02:02:07 pm
could anyone solve this??? ??? ??? ??? ??? ???
[/quote/]
someone PLZ PLZ DO THIS  :(
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everyday we wake up is a miracle, then how do we say miracles dont happen?????

Offline ruby92

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Re: P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
« Reply #115 on: June 07, 2010, 08:56:16 pm »
m/j 2006 7 a b c
if the lamp that shorted is C
so shouldnt the resistance of one of the normal lamps be 30?
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Offline zxcvbnm

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Re: P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
« Reply #116 on: June 07, 2010, 09:50:41 pm »
november 05, question 5, c ii
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Offline Chingoo

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Re: P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
« Reply #117 on: June 07, 2010, 10:23:10 pm »
^would help if my Physics was good enough.

Please explain in DETAIL May/June 2009 Paper 21 Question 7 (in attachment)? I suck at these questions, in-depth explanation would be loved. Thanks in advance!
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Offline astarmathsandphysics

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Re: P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
« Reply #118 on: June 07, 2010, 10:25:38 pm »
m/j 2006 7 a b c
if the lamp that shorted is C
so shouldnt the resistance of one of the normal lamps be 30?
no is 15 cos when S_1 is closed and other two open Resistance is 15
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Offline astarmathsandphysics

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Re: P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
« Reply #119 on: June 07, 2010, 10:28:55 pm »
november 05, question 5, c ii
sum of two amplitudes is A/3
square to get I/9
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