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How Long is the Chain?

It is said that Galileo discovered a basic principle of the pendulum-that the period is independent of the amplitude-by using his pulse to time the period of swinging lamps in the cathedral as they swayed in the breeze. Suppose that one oscillation of a swinging lamp takes 5.5s
How long is the lamp chain?

5.5 = 2π√(L/G)
(.87535)= L/9.8
L = 7.5

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