Find Shear Centre of Cross Sections

[womanengineer]

Please Help.
Trying my best

Homework Statement

Locate the Shear Center of the Cross Sections Below:

1. http://tinypic.com/r/98xfd3/5
2. http://tinypic.com/r/15s4hfk/5

Homework Equations

τ=VQ/IT

The Attempt at a Solution

1.
Moment = O
Solve for Ve


τ=VQ/IT
Solve for τ

For each section
V=∫τtdy

Find I
I=2(I1) + 2(I2) + 2(I3) I4
solve for I
solve for e


Do not know how to start 2.

 

[pongo38]

For the circular part, consider a radius angle theta with the horizontal. Then consider an elemental length of the circumference delta s subtending an angle delta theta at the centre.