Finding the height of a cilinder.

[fawk3s]

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=height
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,
fawk3s

[tiny-tim]

Hi fawk3s! :smile:

(have a pi: π and try using the X2 tag just above the Reply box :wink:)
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?
…
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.)

I make it the same as you. :smile:

(maybe your friends forgot the π ?)