Oak trunk

Calculate in tonnes the approximate weight of a cylindrical oak trunk with a diameter of 66 cm and a length of 4 m, knowing that the density of the wood was 800 kg/m³.

Correct result:

m =  1.0948 t

Solution:

D=66 cm m=66/100  m=0.66 m l=4 m ρ=800 kg/m3  r=D/2=0.66/2=33100=0.33 m S=π r2=3.1416 0.3320.3421 m2  V=S l=0.3421 41.3685 m3 m1=V ρ=1.3685 8001094.7822 kg  m=m1 t=m1/1000  t=1094.7822/1000  t=1.095 t=1.0948 t



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