Steel tube

The steel tube has an inner diameter of 4 cm and an outer diameter of 4.8 cm. The density of the steel is 7800 kg/m3. Calculate its length if it weighs 15 kg.

Correct answer:

l =  3.478 m

Step-by-step explanation:

D1=4 cm m=4:100  m=0.04 m D2=4.8 cm m=4.8:100  m=0.048 m  r1=D1/2=0.04/2=501=0.02 m r2=D2/2=0.048/2=1253=0.024 m  S=π r22π r12=3.1416 0.02423.1416 0.0220.0006 m2  m=15 kg h=7800 kg/m3  V=m/h=15/7800=52010.0019 m3  l=V/S=0.0019/0.0006=3.478 m

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