A cantilever beam AB with a rectangular cross section has a longitudinal hole drilled throughout its length (see figure). The beam supports a load P = 600N. The cross section is 25mm wide and 50mm high, and the hole has a diameter of 10mm.
Find the bending stresses at the top of the beam, at the top of the hole, and at the bottom of the beam.

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10 mm 50 mm 12.5 mm 37.5 mm P=600 N L = 0.4 m 25 mm