Question:

Find the volume of the submerged part of the ring.?

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The outer radius of the ring is 1.98 m and its inner radius is 1.82 m and it is 0.153 m thick. The ring is set to stand so that the submerged part is shaped like an arc. The ring is submerged to a depth of 0.308 m of water. Find the volume of the submerged part of the ring.

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  1. Volume of submerged part = Area x thickness

    Area = Area(segment1) - Area(segment2)

    Let a = angle of 2 pts. along the circle w/ the center of the circle

    Area(segment of a circle) = 0.5(a - sin a)r^2

    a(outer) = 2 arccos[(1.98-.308)/1.98)] = 64.775º

    a(inner) = 2 arccos[(1.98-.308)/1.82)] = 46.5319º

    Area = Area(segment1) - Area(segment2)

             = 0.5(64.775π/180 - sin 64.775)(1.98^2) - 0.5(46.5319π/180 - sin 46.5319)(1.82^2)

            = 0.2997m²

    Volume of submerged part = Area x thickness

                                                     = (0.2997m²)(0.153)

                                                     = 0.04586 m³

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