A performer, seated on a trapeze, is swinging back and forth with a period of 8. If she stands up, thus raising the center of mass of the trapeze +...

A performer, seated on a trapeze, is swinging back and forth with a period of 8.85 s. If she stands up, thus raising the center of mass of the trapeze + performer system by 30.0 cm, what will be the new period of the system? Treat trapeze + performer as a simple pendulum.