The natural frequency ω of vibration of a mass M attached to a rod, as in Fig. P5.64 depends only upon M and the stiffness EI and length L of the rod. Tests with a 2-kg mass attached to a 1040 carbon steel rod of diameter 12 mm and length 40 cm reveal a natural frequency of 0.9 Hz. Use these data to predict the natural frequency of a 1-kg mass attached to a 2024 aluminum-alloy rod of the same size.

Transcribed Image Text:

し1 / Stiffness El