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(a) A pendulum clock consists of an iron...

(a) A pendulum clock consists of an iron rod connected to a small, heavy bob. If it is designed to keep correct time at `20^(@)C` , how fast or slow will it go in 24 hours at `50^(@)C` ? `alpha_(iron)=1.2xx10^(-5)//^(@)C` .
(b) A pendulum clock having copper rod keeps correct time at `20^(@)C` . It gains 15 seconds per day if cooled to `0^(@)C` . Find the coefficient the of linear expansion of copper.

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