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A pendulum clock consists of an iron rod...

A pendulum clock consists of an iron rod connected to a small, heavy bob. If it is designed to keep correct time at `20^(0) C`, how fast or slow will it go in 24 hours at `40^(0) C?` Coefficient of linear expansion of iron `= 1.2 xx 10^(-5) ^0 C^(-6)`.

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