Question:-
For the spring mass system shown in the figure

1, the following of vibration is N. what will be the frequency when one similar spring added in series, as shown in figure 2?
Option (A)
N/2
Option (B)
N/ Ö2
Option(C)
Ö2/N
Option(D)
2N
Correct Option:
(B)
Question Solution:
n1 = (1/2p) Ö(K/m) = N1
Equivalent stiffness of fig. 2 = (k.k / (k+k)) = k/2
n2 = (1/2p) Ö(k/2m) = N/Ö2
question-answer-faq-2885