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suppose a pendulum use to show the rotation of the earth has a period of approximately 16.9 seconds. What is the length using formula T=2pi sq root L/32

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just solve for L in

2π√(L/32) = 16.9
√(L/32) = 16.9/2π = 2.69
L/32 = 7.23
L = 231.51

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