Just a quick question on unit conversion..pls help.

• Hamiltonian1125

  2 Feb 07, 22:13

  Originally posted by FrozernFire:

  multiply by 1000 if not wrong
  
  eg water density 1g/cm3 ---> 1000kg/m3

  Frozen fire is correct! This kind of qns, always convert the units slowly...
  1g=1/1000kg
  1cm^3=1/(100*100*100) m^3 (this part is tricky for beginner who tends to divide by 100 instead but remember it is cm cube i.e (1cm*1cm*1cm) if u do conversion one by one it becomes [(1/100)m*(1/100)m*(1/100)m] that explain why we divide by 1 million.
  
  Now just solve 1g/cm3=(1/1000kg)/[(1/100)m*(1/100)m*(1/100)m]
  =1000kg/m3
  
  Solve more problems for practise...Pm mi if u hav any more qns...
• Hamiltonian1125

  2 Feb 07, 22:16

  Originally posted by davidche:

  then why is acceleration ms-2? and ms-1 speed? i dont find the link?
  
  

  Acceleration is the CHANGE of SPEED with TIME i.e dimensionally speaking we can say the unit of acceleration to be=(m/s)/s
  =m/s2
  =ms-2(law of indices)
• ctstalin

  2 Feb 07, 23:41

  Originally posted by Hamiltonian1125:

  Acceleration is the CHANGE of SPEED with TIME i.e dimensionally speaking we can say the unit of acceleration to be=(m/s)/s
  =m/s2
  =ms-2(law of indices)

  X2
  
  
• davidche

  3 Feb 07, 00:11

  Originally posted by Hamiltonian1125:

  Acceleration is the CHANGE of SPEED with TIME i.e dimensionally speaking we can say the unit of acceleration to be=(m/s)/s
  =m/s2
  =ms-2(law of indices)

  oh i c
  
  your good. thanks alot for your help
• Hamiltonian1125

  3 Feb 07, 00:53

  
• secretliker

  3 Feb 07, 02:01

  1gcm-3
  
  This means, in a space measuring 1cm by 1cm by 1cm, the mass is 1 gram.
  
  In 1m-3, the dimensions are 100cm by 100cm by 100cm.
  
  Therefore, mass in 1m-3 = 100 X 100 X 100 = 1000000 grams
  
  Therefore, 1gcm-3 = 1000kgm-3