During the design of the spring-support system for the 4000-k weighing platform, it is decided that the frequency of free vertical vibration in the unloaded condition shall not exceed 3 cycles per second.
(a) Determine the maximum acceptable spring constant k for each of the three identical springs.
(b) For this spring constant, what would be the natural frequency fn of vertical vibration of the platform loaded by the 40-Mg truck?
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