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P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE

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sweetie:

--- Quote from: astarmathsandphysics 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

--- End quote ---

i still dont get it
cud u plz xplain it again in more detail?
Thank You soooo much :)

thecandydoll:
Could anyone solve this one with diagram =)
Oct/Nov/2009 Variant 22.
Q3--alll =(

The SMA:
can somebody help me on M/J 2004 p2 Q8abc please

cashem'up:

--- Quote from: The SMA on June 08, 2010, 04:29:36 am ---can somebody help me on M/J 2004 p2 Q8abc please

--- End quote ---

theres a formula u should be aware with chek pg 188 of chris mee physics textbook
Vout= VR1 / (R1 + R2)
ok  now lets use it here

a) 1.0= 1.5 R1/ (R1 + 3900)
1.0R1+3900=1.5R1
0.5R1=3900
R1=7800

b)Vout= 1.5x7800 / 1250+7800 = 1.293 V

c)the  voltmeter has 7800 V so parallel voltage is 7800/2 = 3900
now Vout = 1.5x3900 / 3900+3900 = 0.75V

sabrina:
hi guys
physics tomorrow  :'( and im going crazy. someone plz explain m/j2009 var1 q5a. shouldn't it be inphase?

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