Understanding Plane Stress and Mohr's Circle in Truss Structures

[fonseh]

Homework Statement

[/B]
For part b , i think one of the angle either $$\theta_s$$ or $$\theta_p$$ is wrong
For the second question , what is plane stress ?

Homework Equations

The Attempt at a Solution

[/B]
1.) Because in mohr's circle, the maximum shear stress on the vertical axis , for the maximum normal stress , it's on the horizontal axis , right ?

 

[fonseh]

I am sorry that the title of the topic is confusing . I think the part a is not related to part b

 

[fonseh]

Bump

 

[fonseh]

Or is my sketch of mohr's circle is wrong ?