# Wood prisms

How many weight 25 prisms with dimensions 8x8x200 cm? 1 cubic meter of wood weighs 800 kg.

Result

m =  256 kg

#### Solution:

$a = 8 \ cm \ \\ b = 8 \ cm \ \\ c = 200 \ cm \ \\ \ \\ n = 25 \ \\ \ \\ V = n \cdot \ a \cdot \ b \cdot \ c = 25 \cdot \ 8 \cdot \ 8 \cdot \ 200 = 320000 \ cm^3 \ \\ V_{ 1 } = V \rightarrow m^3 = V / 1000000 \ m^3 = 0.32 \ m^3 \ \\ \ \\ h = 800 \ kg/m^3 \ \\ \ \\ m = V_{ 1 } \cdot \ h = 0.32 \cdot \ 800 = 256 = 256 \ \text { kg }$

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