A pendulum having time period equal to two seconds is called a seconds pendulum. Those used in pendulum clocks are of this type. Find the length of a seconds pendulum at a place where g=π2 m s−2.
T=2 sec
T=2π √(lg)
⇒ 2=2π √(l10)
⇒ 110=1π2
⇒ l=1 m (HHπ2≈ 10)