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An annular ring of internal and outer ra...

An annular ring of internal and outer radii `r` and `R` respectively oscillates in a vertical plane about a horizontal axis perpendicular to its plane and passing through a point on its outer edge. Calculate its time period and show that the length of an equivalent simple pendulum is `(3R)/(2)` as `r rarr 0` and `2 R` as `r rarr R`.

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