Time period of a spring mass system is T.If this spring is cut into two parts whose lengths are in ratio 1:3 and the same mass is attached to the longer part, the new time period will be
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Explanation:
We know, k=lEA
k1=l/3EA=l3EA=3k;k2=2l/3EA=2l3EA=23k
When in parallel keff=k1+k2
=29k
T=2πkeffm=2π9k2m
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