A 200-M-Long 6

Multiple Choice

A 2.00-m-long 6.00-kg ladder pivoted at the top hangs down from a platform at the circus. A 42.0-kg trapeze artist climbs to a point where her center of mass is at the center of the ladder and swings at the system's natural frequency. The angular frequency (in s−1) of the system of ladder and woman is

A) 1.01.
B) 3.07.
C) 4.03.
D) 8.05.
E) 16.2.