An elevated storage tank consists of a 4-m-diameter and 6-m-high cylindrical tank supported on three steel columns, where the columns are each 1.5 m in diameter and 35 m high. Estimate the bending moment at the base of the supporting columns that is caused by a 90 km/h wind at an air temperature of 25◦C. A flag mounted behind the storage reservoir is known to flutter at the same frequency that vortices are shed from the storage tank. Estimate the frequency at which the flag flutters.
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