Rotary Lawn Mower Blade Rotates At 3000 Revmin

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.

24 in-

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

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