Question: The radio antenna on a car begins to vibrate wildly at 8 Hz when the car is driven at 45 mi/h over a rutted road

The radio antenna on a car begins to vibrate wildly at 8 Hz when the car is driven at 45 mi/h over a rutted road which approximates a sine wave of amplitude 2 cm and wavelength λ = 2.5 m. The antenna diameter is 4 mm. Is the vibration due to the road or to vortex shedding?

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