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Take the values of (prop) from table 20....

Take the values of (prop) from table `20.2`.
A pendulum clock of time period `2 s` gives the correct time at `30^@ C`. The pendulum is made of iron. How many seconds will it lose or gain per day when the temperature falls tp `0^@ C`? `alpha _(Fe) = 1.2 xx 10^-5 (.^@ C)^-1`.

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