Kui suur on minimaalne töö, mida tuleb teha, et kaevata
6
m
6
m
pikkune,
2
m
2
m
sügavane ja
0
,
5
m
0
,
5
m
laiune kraav? Pinnase keskmine tihedus on
2000
k
g
/
m
3
2000
k
g
/
m
3
.
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