Rotatlon 92 A grandfather clock has a pen- axis dulum that consists of a thin brass disk of radius r = 15.00 cm and mass 1.000 kg that is attached to a long thin rod of negligible mass. The pendulum swings freely about an axis perpendicular to the rod and through the end of the rod opposite the disk, as shown in Fig. 15-56. If the pendulum is to have a pe- riod of 2.000 s for small oscillations at a place where g = 9.800 m/s, what must be the rod length L to the nearest tenth of a millimeter?

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