# Question: the length l in m of a cable hanging between...

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The length L (in m) of a cable hanging between equal supports is: L equals 100 left parenthesis 1 plus 0.0003 s squared right parenthesis where s is the sag (in m) in the middle of the cable. Since: L equals f left parenthesis s right parenthesis find: f left parenthesis 120 right parenthesis