A truss ABC supports a load W at joint B, as shown in the figure. The length L1 of member AB is fixed, but the length of strut BC varies as the angle u is changed. Strut BC has a solid circular cross section. Joint B is restrained against displacement perpendicular to the plane of the truss.
Assuming that collapse occurs by Euler buckling of the strut, determine the angle θ for minimum weight of the strut.
![812_70dabdf4-86f8-4a2d-a199-14223f4a26ad.png](https://secure.tutorsglobe.com/CMSImages/812_70dabdf4-86f8-4a2d-a199-14223f4a26ad.png)