已知:s=2.5mm²=2.5x10ˉ4 dm²,m=89kg,ρ=8.9 kg/dm³;
求:L
铜丝的体积 V = m / ρ = 89000 / 8.9 = 10000 cm3
铜丝的截面面积S = 2.5mm2 = 0,025cm2
L = V/S = 10000 / 0.025 = 400000cm = 4000 m
答:铜丝长为4000米
已知:s=2.5mm²=2.5x10ˉ4 dm²,m=89kg,ρ=8.9 kg/dm³;
求:L
铜丝的体积 V = m / ρ = 89000 / 8.9 = 10000 cm3
铜丝的截面面积S = 2.5mm2 = 0,025cm2
L = V/S = 10000 / 0.025 = 400000cm = 4000 m
答:铜丝长为4000米