Iron density

Calculate the weight of a 2 m long rail pipe with an internal diameter of 10 cm and a wall thickness of 3 mm. The iron density is p = 7.8 g/cm3.

Correct result:

m =  15.1437 kg

Solution:

D1=10 cm h=3 mm cm=3/10  cm=0.3 cm l=2 m cm=2 100  cm=200 cm  D2=D1+2 h=10+2 0.3=535=10.6 cm  r1=D1/2=10/2=5 cm r2=D2/2=10.6/2=5310=5.3 cm  S=π r22π r12=3.1416 5.323.1416 529.7075 cm2   V=S l=9.7075 2001941.5043 cm3  r=7.8 g/cm3 m1=r V=7.8 1941.504315143.7332 g  m=m1 kg=m1/1000  kg=15143.7332/1000  kg=15.144 kg=15.1437 kg



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