What do we mean by the frequencies of objects such as buildings or cars etc?

I can understand the meaning of the frequency of a simple pendulum or any other object in periodic motion but I have a problem in understanding what is meant by the frequency of buildings,cars etc. Please explain this.i also want to know how the amplitude increases in case of resonance.
Shubham8292
Asked Feb 13, 2015
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DavidWilliams
Answered Jun 08, 2018

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