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The pendulum of a clocl beats 1//2 a sec...

The pendulum of a clocl beats `1//2` a second at `20^(@)C`. By how many seconds should it be corrected ina month at `30^(@)C`? Linear expansivity of the material of the pendulum `=9xx10^(-6)//.^(@)C`.

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The correct Answer is:
`116.6s`
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