l = 40 m
d = 1,2 cm
r = d/2
r = 0,6 cm = 0,06 m
ρ = 7800 kg/m³ ; gęstość stali
m = ?
ρ = m / V
m = ρ * V
V = πr²* l
m = ρ * πr²* l
m = 7800 kg/m³ * 3,14 * (0,06 m )² * 40 m
m = 3526,85 kg
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l = 40 m
d = 1,2 cm
r = d/2
r = 0,6 cm = 0,06 m
ρ = 7800 kg/m³ ; gęstość stali
m = ?
ρ = m / V
m = ρ * V
V = πr²* l
m = ρ * πr²* l
m = 7800 kg/m³ * 3,14 * (0,06 m )² * 40 m
m = 3526,85 kg