the thickness of metallic tube is 5 mm m and the inner diameter of the tube is 10 cm find the mass of 70 cm long tube if the destiny of metal b8 gram cm cube.....
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12. The thickness of a metallic tube is 1 cm and the inner diameter of the tube is 12 cm. Find the weight of 1 M long tube, the density of the metal be 7.8 gm/cm3 Ans. 31.869 kg
Inner radius,r=12/2=6cm
thickness=1cm
so,outer radius,R=6+1=7cm
height,h=1m=100cm
volume=pi×(R^2-r^2)×h
=22/7×(7^2-6^2)×100
=22/7×(49-36)×100
=22/7×13×100
286/7×100
=28600/7
since,density=7.7gm/cm^3
also,weight=volume×density
weight=28600/7×7.7gm
=31460gm
or,31.46 kg
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