stresses, for two possible boards (a) the board is solid rectangular cross-section, 300 mm wide by 35 mm tall (b) the board is a hollow rectangular cross-section with same exterior dimensions as (a) and with a 4 mm wall thickness. Recall: In HW 1, you determined the reaction forces and constructed the shear and moment diagram with a 100 kg person standing at the end, and you also determined the maximum moment and maximum shear.
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