# Wood lumber

Wooden lumber is 4 m long and has a cross section square with side 15 cm.

Calculate:
a) the volume of lumber
b) the weight of the lumber if 1 m3 weighs 790 kg

Result

V =  0.09 m3
m =  71.1 kg

#### Solution:

$l = 4 \ \\ a = 15/100 = \dfrac{ 3 }{ 20 } = 0.15 \ \\ V = l \cdot \ a^2 = 4 \cdot \ 0.15^2 = \dfrac{ 9 }{ 100 } = 0.09 = 0.09 \ m^3$
$h = 790 \ \\ m = h \cdot \ V = 790 \cdot \ 0.09 = \dfrac{ 711 }{ 10 } = 71.1 = 71.1 \ \text{ kg }$ Our examples were largely sent or created by pupils and students themselves. Therefore, we would be pleased if you could send us any errors you found, spelling mistakes, or rephasing the example. Thank you!

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