Question: A beam having a cross section in the form of a channel (see figure) is subjected to a bending moment acting about the z axis.

A beam having a cross section in the form of a channel (see figure) is subjected to a bending moment acting about the z axis.
Calculate the thickness t of the channel in order that the bending stresses at the top and bottom of the beam will be in the ratio 7:3, respectively.

55 mm -152 mm-

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