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A disk fixed to a slender rod. The rod is fastened to a fixed frame. If the disk is twisted it will oscillate back and forth about the axis of the rod.

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A rigid body suspended from a fixed horizontal axis. The body may oscillate in a vertical plane due to the action of gravity.

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T²=4П²(I+mL²)/Lgm

T²=4П²(k²+L²)/Lg

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T=2Pi(I/K)^0.5

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A simple pendulum is one which can be considered to be a point mass suspended from a string or rod of negligible mass. It is a resonant system with a single resonant frequency

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Pendulums are used in many engineered objects, such as clocks, metronomes, amusement park rides and earthquake seismometers. In addition, engineers know that understanding the physics of how pendulums behave is an important step towards understanding motion, gravity, inertia and centripetal force.

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swing