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Homework Help: Finding the height of a cilinder.

  1. Sep 14, 2009 #1
    1. The problem statement, all variables and given/known data
    A wooden cilinder (wood's density=1400 kg/cubemeter=1.4 g/cubecm). The diameter of the bottom is 4 cm and the cilinder weights 2.4 kg. How high is it?

    2. Relevant equations

    m= ro*V
    V cilinder= h * S bottom
    S bottom= pi*r(squared)

    3. The attempt at a solution

    V = m/ro
    V = 2400/1.4 = 1714,2857...~1714,29 cubecm

    S bottom = 2(squared) * 3.14 = 12.56 cm(squared)

    h= 1714,29/12,56 = 136,4880...~136,49 cm

    Is this correct or am I missing something? Because some of my friends got 400-something for the answer. So was I or them wrong? Just cant nail it.
    (I dont know the original answer.)

    Thanks in advance,
  2. jcsd
  3. Sep 14, 2009 #2


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    Science Advisor
    Homework Helper

    Hi fawk3s! :smile:

    (have a pi: π and try using the X2 tag just above the Reply box :wink:)
    I make it the same as you. :smile:

    (maybe your friends forgot the π ?)
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