The crate, of mass \(250 \mathrm{~kg}\), hanging from a helicopter (shown in Fig. 2.74(a)) can be modeled as shown in Fig. 2.74(b). The rotor blades of the helicopter rotate at \(300 \mathrm{rpm}\). Find the diameter of the steel cables so that the natural frequency of vibration of the crate is at least twice the frequency of the rotor blades.

Transcribed Image Text:

(a) 1 m m (b) 1 m 2 m