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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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Resonance
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INFOTEXT
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1992-09-02
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24 lines
Rapid and uncontrolled increase in the size
of a vibration when the vibrating object is
subject to a force varying at its natural
frequency. In a trombone, for example, the
length of the air column in the instrument is
adjusted until it resonates with the note
being sounded. Resonance effects are also
produced by many electrical circuits. Tuning
a radio, for example, is done by adjusting
the natural frequency of the receiver circuit
until it coincides with the frequency of the
radio waves falling on the aerial. Resonance
has many physical applications. Children use
it to increase the size of the movement on a
swing, by giving a push at the same point
during each swing. Soldiers marching across a
bridge in step could cause the bridge to
vibrate violently if the frequency of their
steps coincided with its natural frequency.
Resonance was the cause of the collapse of
the Tacoma Narrows bridge, USA, in 1940 when
the frequency of the wind coincided with the
natural frequency of the bridge.