The figure shows a single degree of freedom system. The system consists of a massless rigid bar OP hinged at O and a mass m at end P. The natural frequency of vibration of the system is

\({f_n} = \frac{1}{{2\pi }}\sqrt {\frac{k}{m}}\)

\({f_n} = \frac{1}{{2\pi }}\sqrt {\frac{k}{{4m}}}\)

\({f_n} = \frac{1}{{2\pi }}\sqrt {\frac{k}{2m}}\)

\({f_n} = \frac{1}{{2\pi }}\sqrt {\frac{{2k}}{m}}\)

The figure shows a single degree of freedom system. The system consist

1.	The figure shows a single degree of freedom system. The system consists of a massless rigid bar OP hinged at O and a mass m at end P. The natural frequency of vibration of the system is
A.	\({f_n} = \frac{1}{{2\pi }}\sqrt {\frac{k}{{4m}}}\)
B.	\({f_n} = \frac{1}{{2\pi }}\sqrt {\frac{k}{m}}\)
C.	\({f_n} = \frac{1}{{2\pi }}\sqrt {\frac{k}{2m}}\)
D.	\({f_n} = \frac{1}{{2\pi }}\sqrt {\frac{{2k}}{m}}\)
Answer» B. \({f_n} = \frac{1}{{2\pi }}\sqrt {\frac{k}{m}}\)