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2014-07-09T18:14:47+05:30

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Volume of hollow cylinder = pi h ( R^2 - r^2) = 22/7 x 150( 70^2 - 35^2) = 22/7x 150 x ( 4900 - 1225) = 22/7x 150 x 3675 = 22 x150 x 525= 1732800 square mm = 17328 square cm now weight = volume x density = 17328x 7.8 gms = 135158.4 gms = 135.1584 kg
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