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Math Help - Mass of Cylinder

  1. #1
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    Question Mass of Cylinder

    Question 1
    internal radii of hollow metal cylinder = 5 cm
    external radii of hollow metal cylinder= 6 cm
    Length= 2.4 meter
    Density= 7.6 g/cm^3

    Mass of Cylinder ?

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  2. #2
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    Re: Mass of Cylinder

    area or mass of a cylinder is pi x radius^2
    density= mass x volume
    But how to use the two radii. shoule radius used be 6cm+5cm=11cm ?
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  3. #3
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    Re: Mass of Cylinder

    To find the area of the cross section, subtract the area of the smaller circle from that of the larger circle.
    Thanks from HallsofIvy
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