(Answered) A torture technique used by inquisition included a pendulum

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A torture technique used by inquisition included a pendulum with attached blade. The length and mass of the wooden rod are L=5m and M=10kg, and the steel disk blade has m=30kg and radius R=30cm. While the pendulum swings, the whole system moves vertically down at a rate of 1mm/min. Considering that the pendulum has a small amplitude, how many oscillations the pendulum will make when it has moved 1m distance downward?

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