To determine the equivalent moment of inertia of a rigid helicopter component, an engineer decides to run a test in which she pins the component a distance of 40 cm and mounts the component on two springs of stiffness 3.6 times 10^5 N/m. She then provides a harmonic excitation to the component at different frequencies and finds that the maximum amplitude occurs at 50 rad/s. What is the equivalent centroidal moment of inertia predicted by the test?