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Elementary education

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A napkin ring is being made of cast silver. It has the shape of a cylinder 1.25 inches high, with a cylindrical hole 2 inch in diameter and a thickness of 1/16 inch. How many ounces of silver are needed? [silver weighs 6 ounces per cubic inch]

  • Elementary education -

    Yes math

  • Elementary education -

    inside radius = 1 inch
    outside radius = 1.0625 inch

    volume = 1.25 (pi)(1.0625^2-1)

    = .5062 in^3

    mass = 6 * .5062 = 3.04 oz

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