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19. The thickness of a metallic tube is 1 em and the inner diameter of the tube is12 cm. Find the weight of 1 m long tube, if the density of the metal is 7.8 g/em3 |
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Answer» Inner radius,r=12/2=6cmthickness=1cmso,outer radius,R=6+1=7cmheight,h=1m=100cmvolume=pi×(R^2-r^2)×h=22/7×(7^2-6^2)×100=22/7×(49-36)×100=22/7×13×100286/7×100=28600/7since,density=7.8gm/cm^3also,weight=volume×densityweight=28600/7×7.8gm=31460gm or,31.46 kg |
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