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    dragosani's Avatar
    dragosani Posts: 6, Reputation: 1
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    #1

    Feb 8, 2009, 08:06 PM
    Spring constants
    An elastic cord is 65 cm long when a wieght of 75N hangs from it but is 85 cm long when a weight of 180 N hangs from it. What is the "spring" constant k of this elastic cord.
    I know that k= f/x. Separately, than gives you: 75N/0 .65m = 115.4N/m and 180N/.85m= 211.8N/m. But I figured k would be the same. It's obviously not and now I don't know what else to do. Any help is appreciated.Thank you.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Feb 9, 2009, 01:06 PM

    The actual formula is . Here you don't know what the starting length of the elastic cord is. What you do know is:



    Now solve for k.
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