A pendulum clock (fitted with a small heavy bob
that is connected with a metal rod) is 5 seconds
fast each day at a temperature of 150C and
10 seconds slow at a temperature of 300 C. The
temperature at which it is designed to give correct
time is
let t is the temperature at which clock show right timing
the change in period of a pendulum when the temperature is changed by is
at 30 degree loss is 10
solving t=200 C