One of the blades of an electric fan is removed. The steel shaft \(A B\), on which the blades are mounted, is equivalent to a uniform shaft of diameter \(25 \mathrm{~mm}\) and length \(150 \mathrm{~mm}\). Each blade can be modeled as a uniform slender rod of mass \(1 \mathrm{~kg}\) and length \(300 \mathrm{~mm}\). Determine the natural frequency of vibration of the remaining three blades about the \(y\)-axis.

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X 150 mm- B y FIGURE 2.99 Electric fan with one blade missing.