# Question

A rotary lawn-mower blade rotates at 3000 rev/min. The steel blade has a uniform cross section 1/8 in thick by 1 ¼ in wide, and has a ½ -in-diameter hole in the center as shown in the figure.

Estimate the nominal tensile stress at the central section due to rotation.

Estimate the nominal tensile stress at the central section due to rotation.

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