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An elastic cord is 69 {\rm cm} long when a weight of 79 {\rm N} hangs from it but is 90 {\rm cm} long when a weight of 170 {\rm N} hangs from it.What is the "spring" constant k of this elastic cord?
14 years ago

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bobpursley
dforce/dx= k

(170-69)/(.9-.69) = k
14 years ago

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