Calculate 9981

The iron pipe has a length of 2m and a diameter of 4cm. If the density of iron is 7870 kg/m3, calculate its weight.

Correct answer:

m =  19.7795 kg

Step-by-step explanation:

l=2 m D=4 cm m=4:100  m=0.04 m  r=D/2=0.04/2=501=0.02 m  V=l π r2=2 3.1416 0.0220.0025 m3 ρ=7870 kg/m3  m=ρ V=7870 0.0025=19.7795 kg

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