t = 2*pi*sqrt(L/g) where L is the length of the pendulum and g is the force of gravity.
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A longer pendulum has a longer period.
It doesn't matter what unit you use to measure the physical length of the pendulum. As a matter of fact, it doesn't matter what unit you use to measure the duration of its period either. If both are at rest on the same planet, then the penduum with the longer string has the longer period. Period!
multiply the length of the pendulum by 4, the period doubles. the period is proportional to the square of the pendulum length.
Increase the length of the pendulum
The length of the pendulum and the gravitational pull.