A clock with a metal pendulum beating seconds keeps correct time at\[0{}^\circ C\]. If it loses 12.5 s a day at\[25{}^\circ C\], the coefficient of linear expansion of metal of pendulum is

\[\frac{1}{43200}/k{}^\circ C\]

\[\frac{1}{86400}/k{}^\circ C\]

\[\frac{1}{14400}/k{}^\circ C\]

\[\frac{1}{28800}/k{}^\circ C\]

A clock with a metal pendulum beating seconds keeps correct time at\[0

1.	A clock with a metal pendulum beating seconds keeps correct time at\[0{}^\circ C\]. If it loses 12.5 s a day at\[25{}^\circ C\], the coefficient of linear expansion of metal of pendulum is
A.	\[\frac{1}{86400}/k{}^\circ C\]
B.	\[\frac{1}{43200}/k{}^\circ C\]
C.	\[\frac{1}{14400}/k{}^\circ C\]
D.	\[\frac{1}{28800}/k{}^\circ C\]
Answer» B. \[\frac{1}{43200}/k{}^\circ C\]