T =2 pi sqrt(L/g) = k sqrt L where k is a constant (on earth)
k sqrt L = 4.2
k sqt (L-1) = 3.7
k^2 L = 17.64
k^2 (L -1) = 13.69
k^2 L / k^2(L-1) = 17.62/13.69
L/(L-1) = 1.287
L = 1.387 L - 1.287
0.387 L = 1.287
a simple pendulum has a period of 4.2 s. when it is shortened by 1.0 m the period is only 3.7 s.
A. without assuming a value for g , calculate the original length of the pendulum
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