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tether
A tether is a cord, fixture, or flexible attachment that anchors something movable to a reference point which may be fixed or moving. There are a number of applications for tethers: balloons, kites, tethered wind-energy conversion systems, anchors, tethered water-flow energy conversion systems, towing, animal constraint, spaceflight, and power-kiting. Also, tethering to prevent theft of an object like a computer at a school or library is now commonly seen.
==Failures==
Tethers may break by various means; if a tether is a signal, then interruption by signal barriers breaks the tether. If the tether is a cord or rope, then upon reaching the breaking strength of the tether, the tether fails in its function. Failure modes for tethers are considered when designing arrangements where a tether is needed. When a tether or line breaks suddenly, backlash of the segments may cause severe damage or loss of life. Safety links are sometimes used to prevent excessive tension in a tether involved in towing objects or persons, like in the towing of sailplanes; the safety link in a tether is thus a tether itself.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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