A thin, round disk made of acrylic plastic with a uniform density of 1.1 g/cm3 is 20.0 cm in diameter and 1.0 cm thick. A very small hole is drilled through the disk at a point =7.0 cm from the center. The disk is hung from the hole on a nail and set into simple harmonic motion on the surface of Earth with a maximum angular displacement (measured from vertical) of =6.0∘. A disk hanging from a nail. The nail goes through a hole a distance d above and slightly to the left of the center of the disk. Two dashed lines originate at the hole: one extends vertically downward; the other extends down and to the right, passing through the center of the disk. The angle between the two dashed lines is theta. Calculate the period of the motion.