PURPOSE: complicated Physics Learning product is provided to explanation simple harmonic motion, resonance effects, the law of inertia. ;CONSTITUTION: the length is different than string (I, j, k), and the period longer length as character string becomes longer. Magnet (e, g) is weight and the floor of the adsorption capacity between connection and disassembly and the one of gravity generation. The circulation swings variation and becomes much larger as gravity. ;The 2013 of copyright KIPO submissions
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