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.
![954_5890eec0-ba0f-4bb9-89d6-789f9d5478fc.png](https://secure.tutorsglobe.com/CMSImages/954_5890eec0-ba0f-4bb9-89d6-789f9d5478fc.png)