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Question: in fig p41 a potentiometer whose moving part weighs 001...

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4.6 In Fig. P4.1 a potentiometer whose moving part weighs 0.01 lbf measures the displacement of a spring-mass system subjected to a step input. The measured natural frequency is 30 Hz. If the spring constant and mass M of the system are unknown, can the true natural frequency be deduced from the above data? Suppose an additional 0.01-lbf weight is attached to the potentiometer and the test repeated, giving a 25-Hz frequency. Calculate the true natural frequency of the system, that is, the frequency before the potentiometer was attached 0.01 30 Hz 25 Hz Figure P4.1

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