What is the length of a simple pendulum, which ticks seconds ?

Show that the motion of a simple pendulum is simple harmonic and hence derivean equation for its time period. Find the length of a simple pendulum which ticks seconds. (g=9.8ms^(-2))

What is the length of a seconds pendulum?

What is the length of second's pendulum ?

The length of a second pendulum is

The length of a second pendulum is

State the laws of a simple pendulum. What is seconds pendulum? Calculate its length.