Skills for analyzing processes involving vibrational motion
Willis Tower vibration The mass of the Willis (formerly Sears) Tower in Chicago is about 2 x 108 kg. The tower sways back and forth at a frequency of about 0.10 Hz. (a) Estimate the effective spring constant for this swaying motion. Explain why you included a particular number of significant figures. (b) A gust of wind hitting the building exerts a force of about 4 x 106 N. By approximately how much is the top of the building displaced by the wind? Explain why you included a particular number of significant figures. State the assumptions that you made. Does your answer make sense?
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