3. The Department of Highways at Dale City put up a signage with a thickness of 4 inch at the corner of the highway. The steel post is 72-inch-high with a cross section of 2 in x % in. and it can undergo torsional vibration (about the z-axis) or bending vibration (either in the zx-plane or the yz-plane). Determine the natural frequency of the post in a storm during which the wind velocity has a frequency component of 1.30 Hz. Let the density of steel be 0.283 Ib/in3 and torsional stiffness of a shaft with a rectangular section be: - a0:(1 - )] k, = 5.33 ab°G 12a4

3. The Department of Highways at Dale City put up a signage with a thickness of 4 inch at the corner of the highway. The steel post is 72-inch-high with a cross section of 2 in x % in. and it can undergo torsional vibration (about the z-axis) or bending vibration (either in the zx-plane or the yz-plane). Determine the natural frequency of the post in a storm during which the wind velocity has a frequency component of 1.30 Hz. Let the density of steel be 0.283 Ib/in3 and torsional stiffness of a shaft with a rectangular section be: - a0:(1 - )] k, = 5.33 ab°G 12a4

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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