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5.6-14 A cantilever beam AB with a circular cross section and length L 750 mm supports a load P 800 N acting at the free end (see figure). The beam is made of steel with an allowable bending stress of 120 MPa. (a) Determine the required diameter dmin (figure part a) of the beam, considering the effect of the beams own weight. (b) Repeat part (a) if the beam is hollow with wall thickness t d/8 (figure part b0; compare the cross-sectional areas of the two designs. (a) (b) PROBLEM 5.6-14

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