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the thickness of a metallic tube is 1 cm and the inner diameter of tube is 12 cm . Find the weight of 1 meter tube long, if the density of metal be 7.8 gram/cm^3

  • maths -

    Area of a circle = ðr²

    Inner diameter = 12 cm
    Inner radius = 6 cm
    Outer radius = 6+1 = 7 cm

    Cross sectional area of an annulus (ring)
    = ð(r2²-r1²)
    =(7²-6²)ð
    =13ð cm²

    Volume for a 1 metre tube:
    V=13ð&100cm cm³
    =1300 cm³

    Mass ("weight")
    =volume * density.

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