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Calculeaza g grinda lemn L=400cm l=20cm h=10cm Ro=0,75g/cm cub

Răspuns :

V = L x l x h = 400cmx20cmx10cm = 80 000 cm³

ρ = m/V => m = ρ×V = 0,75g/cm³×80 000cm³ = 60 000g = 60 kg

G = m×g = 60kg×9,8N/kg = 588 N