No one has any new questions?

• popikachu

  24 Aug 07, 23:09

  Originally posted by cApitaland:

  the ans. is 3 amiright?

  yup ^^
  
  but but... do you know why or not? or you used them like algebra to solve de?
• wishboy

  26 Aug 07, 12:48

  A thermocouple is set up with the cold junction placed in melting ice at 0°C.
  When the hot junction is placed in boiling water, the e.m.f. measured is 12.00 mV.
  When the hot junction is placed in liquid with temperature è, the e.m.f. measured is 4.20 mV.
  What is the temperature of the liquid?
  
  i know about the general equation, è=(x_è-x_0)/(x_100-x_0 )
  but dunno substitute which value into which
  
  EDIT: sec 3 lvl here
• tanjun

  26 Aug 07, 20:11

  Originally posted by wishboy:

  A thermocouple is set up with the cold junction placed in melting ice at 0°C.
  When the hot junction is placed in boiling water, the e.m.f. measured is 12.00 mV.
  When the hot junction is placed in liquid with temperature è, the e.m.f. measured is 4.20 mV.
  What is the temperature of the liquid?
  
  i know about the general equation, è=(x_è-x_0)/(x_100-x_0 )
  but dunno substitute which value into which
  
  EDIT: sec 3 lvl here

  I can't rmb whether emf measured by the thermocouple is directly proportional to the difference of temperature between the cold junction and the hot junction.
  
  If it is,
  
  E = ad
  where E is the emf, a is a constant and d is the difference in temperature between the cold junction and hot junction.
  
  When E = 12 mV, d = 100 - 0 = 100,
  12 = a(100)
  a = 0.12
  
  E = 0.12 d
  When E = 4.20,
  4.20 = 0.12 d
  d = 35
  
  Therefore, temperature of the liquid = d + 0
  = 35
• unclebutcher

  26 Aug 07, 23:03

  if you have a question pls open a new thread
• wishboy

  26 Aug 07, 23:08

  ok thx
  and.. i tot this thread was for askin qns?
• hiphop2009

  26 Aug 07, 23:43

  Originally posted by wishboy:

  ok thx
  and.. i tot this thread was for askin qns?

  haha....
  
  this thread is eagle open one.....hmm.....
  
  but i prefer u all open a new topic if ur question is rather long.
• seow

  26 Aug 07, 23:44

  I will soon, physics prelim this wednesday, and with a super low capacity brain and frankly quite inept teacher, i sure will need all the help i can get.
• ^tamago^

  26 Aug 07, 23:55

  should we start categorizing question threads (one for 'o' lvl maths, 'a' lvl maths, 'o' lvl chem etc) and sticky them?