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A clock with a brass pendulum shaft keep...

A clock with a brass pendulum shaft keeps correct time at a certain temperature.
a. How closely must the temperature be controlled if the clock is not to gain or lose more that 1 s a day? Does the answer depend on the period of the pendulum?
b. Will an increase of temperature cause the clock to gain or lose? `(alpha_("brass")=2 xx 10^(-5)//^(@)C)`

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