Scince
posted by anum .
How the change of amplitude effects the time of one cycle of a pendulum?

Scince 
Count Iblis
Denote the length of the pendulum by L and the amplitude by A. The period is given by:
T = 2 pi sqrt(L/g) [1 + 1/16 (A/L)^2 + term of order (A/L)^4]
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