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Answer the following question :
What is the frequency of oscillation of a simple pendulum mounted in a cabin that is freely falling under gravity ?

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During free fall of the cabin, the effective acceleration `g. = g- g= 0`. Therefore, the frequency of the oscillation is also zero and periodic time `T= 2pi sqrt((l)/(g)) = 2pi sqrt((l)/(0)) =` infinite.
Hence the pendulum will not vibrate at all.
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