Page "Harmonic oscillator" Paragraph 9
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Mechanical examples include pendula ( with small angles of displacement ), masses connected to springs, and acoustical systems.
The harmonic oscillator model is very important in physics, because any mass subject to a force in stable equilibrium acts as a harmonic oscillator for small vibrations.
Harmonic oscillators occur widely in nature and are exploited in many manmade devices, such as clocks and radio circuits.
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