Tuesday, March 1, 2011

Ishaka's Volume Scribe Post

7.3


d/2=r
20.3/2=r10.15=r (π.r.r)x h=v
(3.14 . 10.15 . 10.15) x 10=v
323.49065cm^2 x 10cm=v
3 234.9065cm^3=v
The Answer: 3 234.9065cm^3














7.4


M.I
* height = 10m
* diameter = 1 (outside) and 0.8 (inside)

Outside :
r = d/2
r = 1/2
r = 0.5

v = (π x r x r) x h
v = (3.14 x 0.5 x 0.5) x h
v = 0.78m^2 x 10m
v = 7.8m^3

Inside :
r = d/2
r = 0.8/2
r = 0.4

v = (π x r x r) x h
v = (3.14 x 0.4 x 0.4) x h
v = 0.5m^2 x 10m
v = 5m^3

Inside = 5m^3
Outside = 7.8m^3







volume2 - volume1 = volume of culvert
7.8m^3 - 5m^3 = 2.8m^3

The concrete required to make the culvert is 2.8m^3

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