# Mass

The thickness of a metallic tube is 1cm and its outer radius is 11cm. Find the mass of such 1m long tube, if the density of the metal is 7.5g per cubic cm.

Result

m =  49.48 kg

#### Solution:

$m=7.5 \cdot \ 100 \pi \cdot \ (11^{ 2 }-(11-1)^{ 2 })/1000=49.48 \ \text{kg}$

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